// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
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package com.google.protobuf;

import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.fail;

import com.google.protobuf.Descriptors.Descriptor;
import com.google.protobuf.Descriptors.EnumDescriptor;
import com.google.protobuf.Descriptors.EnumValueDescriptor;
import com.google.protobuf.Descriptors.FieldDescriptor;
import map_test.MapTestProto.BizarroTestMap;
import map_test.MapTestProto.ReservedAsMapField;
import map_test.MapTestProto.ReservedAsMapFieldWithEnumValue;
import map_test.MapTestProto.TestMap;
import map_test.MapTestProto.TestMap.MessageValue;
import map_test.MapTestProto.TestMapOrBuilder;
import map_test.MapTestProto.TestOnChangeEventPropagation;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/** Unit tests for map fields. */
@RunWith(JUnit4.class)
public class MapTest {

  private void setMapValuesUsingMutableMap(TestMap.Builder builder) {
    builder.getMutableInt32ToInt32Field().put(1, 11);
    builder.getMutableInt32ToInt32Field().put(2, 22);
    builder.getMutableInt32ToInt32Field().put(3, 33);
  //
    builder.getMutableInt32ToStringField().put(1, "11");
    builder.getMutableInt32ToStringField().put(2, "22");
    builder.getMutableInt32ToStringField().put(3, "33");
  //
    builder.getMutableInt32ToBytesField().put(1, TestUtil.toBytes("11"));
    builder.getMutableInt32ToBytesField().put(2, TestUtil.toBytes("22"));
    builder.getMutableInt32ToBytesField().put(3, TestUtil.toBytes("33"));
  //
    builder.getMutableInt32ToEnumField().put(1, TestMap.EnumValue.FOO);
    builder.getMutableInt32ToEnumField().put(2, TestMap.EnumValue.BAR);
    builder.getMutableInt32ToEnumField().put(3, TestMap.EnumValue.BAZ);
  //
    builder.getMutableInt32ToMessageField().put(
        1, MessageValue.newBuilder().setValue(11).build());
    builder.getMutableInt32ToMessageField().put(
        2, MessageValue.newBuilder().setValue(22).build());
    builder.getMutableInt32ToMessageField().put(
        3, MessageValue.newBuilder().setValue(33).build());
  //
    builder.getMutableStringToInt32Field().put("1", 11);
    builder.getMutableStringToInt32Field().put("2", 22);
    builder.getMutableStringToInt32Field().put("3", 33);
  }

  private void setMapValuesUsingAccessors(TestMap.Builder builder) {
    builder
        .putInt32ToInt32Field(1, 11)
        .putInt32ToInt32Field(2, 22)
        .putInt32ToInt32Field(3, 33)
        .putInt32ToStringField(1, "11")
        .putInt32ToStringField(2, "22")
        .putInt32ToStringField(3, "33")
        .putInt32ToBytesField(1, TestUtil.toBytes("11"))
        .putInt32ToBytesField(2, TestUtil.toBytes("22"))
        .putInt32ToBytesField(3, TestUtil.toBytes("33"))
        .putInt32ToEnumField(1, TestMap.EnumValue.FOO)
        .putInt32ToEnumField(2, TestMap.EnumValue.BAR)
        .putInt32ToEnumField(3, TestMap.EnumValue.BAZ)
        .putInt32ToMessageField(1, MessageValue.newBuilder().setValue(11).build())
        .putInt32ToMessageField(2, MessageValue.newBuilder().setValue(22).build())
        .putInt32ToMessageField(3, MessageValue.newBuilder().setValue(33).build())
        .putStringToInt32Field("1", 11)
        .putStringToInt32Field("2", 22)
        .putStringToInt32Field("3", 33);
  }

  @Test
  public void testSetMapValues() {
    TestMap.Builder usingMutableMapBuilder = TestMap.newBuilder();
    setMapValuesUsingMutableMap(usingMutableMapBuilder);
    TestMap usingMutableMap = usingMutableMapBuilder.build();
    assertMapValuesSet(usingMutableMap);

    TestMap.Builder usingAccessorsBuilder = TestMap.newBuilder();
    setMapValuesUsingAccessors(usingAccessorsBuilder);
    TestMap usingAccessors = usingAccessorsBuilder.build();
    assertMapValuesSet(usingAccessors);

    assertThat(usingAccessors).isEqualTo(usingMutableMap);
  }

  private void copyMapValues(TestMap source, TestMap.Builder destination) {
    destination
        .putAllInt32ToInt32Field(source.getInt32ToInt32FieldMap())
        .putAllInt32ToStringField(source.getInt32ToStringFieldMap())
        .putAllInt32ToBytesField(source.getInt32ToBytesFieldMap())
        .putAllInt32ToEnumField(source.getInt32ToEnumFieldMap())
        .putAllInt32ToMessageField(source.getInt32ToMessageFieldMap())
        .putAllStringToInt32Field(source.getStringToInt32FieldMap());
  }

  private void assertMapValuesSet(TestMap message) {
    assertThat(message.getInt32ToInt32FieldMap()).hasSize(3);
    assertThat(message.getInt32ToInt32FieldMap().get(1).intValue()).isEqualTo(11);
    assertThat(message.getInt32ToInt32FieldMap().get(2).intValue()).isEqualTo(22);
    assertThat(message.getInt32ToInt32FieldMap().get(3).intValue()).isEqualTo(33);

    assertThat(message.getInt32ToStringFieldMap()).hasSize(3);
    assertThat(message.getInt32ToStringFieldMap()).containsEntry(1, "11");
    assertThat(message.getInt32ToStringFieldMap()).containsEntry(2, "22");
    assertThat(message.getInt32ToStringFieldMap()).containsEntry(3, "33");

    assertThat(message.getInt32ToBytesFieldMap()).hasSize(3);
    assertThat(message.getInt32ToBytesFieldMap()).containsEntry(1, TestUtil.toBytes("11"));
    assertThat(message.getInt32ToBytesFieldMap()).containsEntry(2, TestUtil.toBytes("22"));
    assertThat(message.getInt32ToBytesFieldMap()).containsEntry(3, TestUtil.toBytes("33"));

    assertThat(message.getInt32ToEnumFieldMap()).hasSize(3);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(1, TestMap.EnumValue.FOO);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(2, TestMap.EnumValue.BAR);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(3, TestMap.EnumValue.BAZ);

    assertThat(message.getInt32ToMessageFieldMap()).hasSize(3);
    assertThat(message.getInt32ToMessageFieldMap().get(1).getValue()).isEqualTo(11);
    assertThat(message.getInt32ToMessageFieldMap().get(2).getValue()).isEqualTo(22);
    assertThat(message.getInt32ToMessageFieldMap().get(3).getValue()).isEqualTo(33);

    assertThat(message.getStringToInt32FieldMap()).hasSize(3);
    assertThat(message.getStringToInt32FieldMap().get("1").intValue()).isEqualTo(11);
    assertThat(message.getStringToInt32FieldMap().get("2").intValue()).isEqualTo(22);
    assertThat(message.getStringToInt32FieldMap().get("3").intValue()).isEqualTo(33);
  }

  private void updateMapValuesUsingMutableMap(TestMap.Builder builder) {
    builder.getMutableInt32ToInt32Field().put(1, 111);
    builder.getMutableInt32ToInt32Field().remove(2);
    builder.getMutableInt32ToInt32Field().put(4, 44);
  //
    builder.getMutableInt32ToStringField().put(1, "111");
    builder.getMutableInt32ToStringField().remove(2);
    builder.getMutableInt32ToStringField().put(4, "44");
  //
    builder.getMutableInt32ToBytesField().put(1, TestUtil.toBytes("111"));
    builder.getMutableInt32ToBytesField().remove(2);
    builder.getMutableInt32ToBytesField().put(4, TestUtil.toBytes("44"));
  //
    builder.getMutableInt32ToEnumField().put(1, TestMap.EnumValue.BAR);
    builder.getMutableInt32ToEnumField().remove(2);
    builder.getMutableInt32ToEnumField().put(4, TestMap.EnumValue.QUX);
  //
    builder.getMutableInt32ToMessageField().put(
        1, MessageValue.newBuilder().setValue(111).build());
    builder.getMutableInt32ToMessageField().remove(2);
    builder.getMutableInt32ToMessageField().put(
        4, MessageValue.newBuilder().setValue(44).build());
  //
    builder.getMutableStringToInt32Field().put("1", 111);
    builder.getMutableStringToInt32Field().remove("2");
    builder.getMutableStringToInt32Field().put("4", 44);
  }

  private void updateMapValuesUsingAccessors(TestMap.Builder builder) {
    builder
        .putInt32ToInt32Field(1, 111)
        .removeInt32ToInt32Field(2)
        .putInt32ToInt32Field(4, 44)
        .putInt32ToStringField(1, "111")
        .removeInt32ToStringField(2)
        .putInt32ToStringField(4, "44")
        .putInt32ToBytesField(1, TestUtil.toBytes("111"))
        .removeInt32ToBytesField(2)
        .putInt32ToBytesField(4, TestUtil.toBytes("44"))
        .putInt32ToEnumField(1, TestMap.EnumValue.BAR)
        .removeInt32ToEnumField(2)
        .putInt32ToEnumField(4, TestMap.EnumValue.QUX)
        .putInt32ToMessageField(1, MessageValue.newBuilder().setValue(111).build())
        .removeInt32ToMessageField(2)
        .putInt32ToMessageField(4, MessageValue.newBuilder().setValue(44).build())
        .putStringToInt32Field("1", 111)
        .removeStringToInt32Field("2")
        .putStringToInt32Field("4", 44);
  }

  @Test
  public void testUpdateMapValues() {
    TestMap.Builder usingMutableMapBuilder = TestMap.newBuilder();
    setMapValuesUsingMutableMap(usingMutableMapBuilder);
    TestMap usingMutableMap = usingMutableMapBuilder.build();
    assertMapValuesSet(usingMutableMap);

    TestMap.Builder usingAccessorsBuilder = TestMap.newBuilder();
    setMapValuesUsingAccessors(usingAccessorsBuilder);
    TestMap usingAccessors = usingAccessorsBuilder.build();
    assertMapValuesSet(usingAccessors);

    assertThat(usingAccessors).isEqualTo(usingMutableMap);
    //
    usingMutableMapBuilder = usingMutableMap.toBuilder();
    updateMapValuesUsingMutableMap(usingMutableMapBuilder);
    usingMutableMap = usingMutableMapBuilder.build();
    assertMapValuesUpdated(usingMutableMap);

    usingAccessorsBuilder = usingAccessors.toBuilder();
    updateMapValuesUsingAccessors(usingAccessorsBuilder);
    usingAccessors = usingAccessorsBuilder.build();
    assertMapValuesUpdated(usingAccessors);

    assertThat(usingAccessors).isEqualTo(usingMutableMap);
  }

  private void assertMapValuesUpdated(TestMap message) {
    assertThat(message.getInt32ToInt32FieldMap()).hasSize(3);
    assertThat(message.getInt32ToInt32FieldMap().get(1).intValue()).isEqualTo(111);
    assertThat(message.getInt32ToInt32FieldMap().get(3).intValue()).isEqualTo(33);
    assertThat(message.getInt32ToInt32FieldMap().get(4).intValue()).isEqualTo(44);

    assertThat(message.getInt32ToStringFieldMap()).hasSize(3);
    assertThat(message.getInt32ToStringFieldMap()).containsEntry(1, "111");
    assertThat(message.getInt32ToStringFieldMap()).containsEntry(3, "33");
    assertThat(message.getInt32ToStringFieldMap()).containsEntry(4, "44");

    assertThat(message.getInt32ToBytesFieldMap()).hasSize(3);
    assertThat(message.getInt32ToBytesFieldMap()).containsEntry(1, TestUtil.toBytes("111"));
    assertThat(message.getInt32ToBytesFieldMap()).containsEntry(3, TestUtil.toBytes("33"));
    assertThat(message.getInt32ToBytesFieldMap()).containsEntry(4, TestUtil.toBytes("44"));

    assertThat(message.getInt32ToEnumFieldMap()).hasSize(3);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(1, TestMap.EnumValue.BAR);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(3, TestMap.EnumValue.BAZ);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(4, TestMap.EnumValue.QUX);

    assertThat(message.getInt32ToMessageFieldMap()).hasSize(3);
    assertThat(message.getInt32ToMessageFieldMap().get(1).getValue()).isEqualTo(111);
    assertThat(message.getInt32ToMessageFieldMap().get(3).getValue()).isEqualTo(33);
    assertThat(message.getInt32ToMessageFieldMap().get(4).getValue()).isEqualTo(44);

    assertThat(message.getStringToInt32FieldMap()).hasSize(3);
    assertThat(message.getStringToInt32FieldMap().get("1").intValue()).isEqualTo(111);
    assertThat(message.getStringToInt32FieldMap().get("3").intValue()).isEqualTo(33);
    assertThat(message.getStringToInt32FieldMap().get("4").intValue()).isEqualTo(44);
  }

  private void assertMapValuesCleared(TestMapOrBuilder testMapOrBuilder) {
    assertThat(testMapOrBuilder.getInt32ToInt32FieldMap()).isEmpty();
    assertThat(testMapOrBuilder.getInt32ToInt32FieldCount()).isEqualTo(0);
    assertThat(testMapOrBuilder.getInt32ToStringFieldMap()).isEmpty();
    assertThat(testMapOrBuilder.getInt32ToStringFieldCount()).isEqualTo(0);
    assertThat(testMapOrBuilder.getInt32ToBytesFieldMap()).isEmpty();
    assertThat(testMapOrBuilder.getInt32ToBytesFieldCount()).isEqualTo(0);
    assertThat(testMapOrBuilder.getInt32ToEnumFieldMap()).isEmpty();
    assertThat(testMapOrBuilder.getInt32ToEnumFieldCount()).isEqualTo(0);
    assertThat(testMapOrBuilder.getInt32ToMessageFieldMap()).isEmpty();
    assertThat(testMapOrBuilder.getInt32ToMessageFieldCount()).isEqualTo(0);
    assertThat(testMapOrBuilder.getStringToInt32FieldMap()).isEmpty();
    assertThat(testMapOrBuilder.getStringToInt32FieldCount()).isEqualTo(0);
  }

  @Test
  public void testGetMapIsImmutable() {
    TestMap.Builder builder = TestMap.newBuilder();
    assertMapsAreImmutable(builder);
    assertMapsAreImmutable(builder.build());

    setMapValuesUsingAccessors(builder);
    assertMapsAreImmutable(builder);
    assertMapsAreImmutable(builder.build());
  }

  private void assertMapsAreImmutable(TestMapOrBuilder testMapOrBuilder) {
    assertImmutable(testMapOrBuilder.getInt32ToInt32FieldMap(), 1, 2);
    assertImmutable(testMapOrBuilder.getInt32ToStringFieldMap(), 1, "2");
    assertImmutable(testMapOrBuilder.getInt32ToBytesFieldMap(), 1, TestUtil.toBytes("2"));
    assertImmutable(testMapOrBuilder.getInt32ToEnumFieldMap(), 1, TestMap.EnumValue.FOO);
    assertImmutable(
        testMapOrBuilder.getInt32ToMessageFieldMap(), 1, MessageValue.getDefaultInstance());
    assertImmutable(testMapOrBuilder.getStringToInt32FieldMap(), "1", 2);
  }

  private <K, V> void assertImmutable(Map<K, V> map, K key, V value) {
    try {
      map.put(key, value);
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
  }

  @Test
  public void testMutableMapLifecycle() {
    TestMap.Builder builder = TestMap.newBuilder();
    Map<Integer, Integer> intMap = builder.getMutableInt32ToInt32Field();
    intMap.put(1, 2);
    assertThat(builder.build().getInt32ToInt32Field()).isEqualTo(newMap(1, 2));
    try {
      intMap.put(2, 3);
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    assertThat(builder.getInt32ToInt32Field()).isEqualTo(newMap(1, 2));
    builder.getMutableInt32ToInt32Field().put(2, 3);
    assertThat(builder.getInt32ToInt32Field()).isEqualTo(newMap(1, 2, 2, 3));
  //
    Map<Integer, TestMap.EnumValue> enumMap = builder.getMutableInt32ToEnumField();
    enumMap.put(1, TestMap.EnumValue.BAR);
    assertThat(builder.build().getInt32ToEnumField())
        .isEqualTo(newMap(1, TestMap.EnumValue.BAR));
    try {
      enumMap.put(2, TestMap.EnumValue.FOO);
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    assertThat(builder.getInt32ToEnumField()).isEqualTo(newMap(1, TestMap.EnumValue.BAR));
    builder.getMutableInt32ToEnumField().put(2, TestMap.EnumValue.FOO);
    assertThat(builder.getInt32ToEnumField()).isEqualTo(
        newMap(1, TestMap.EnumValue.BAR, 2, TestMap.EnumValue.FOO));
  //
    Map<Integer, String> stringMap = builder.getMutableInt32ToStringField();
    stringMap.put(1, "1");
    assertThat(builder.build().getInt32ToStringField()).isEqualTo(newMap(1, "1"));
    try {
      stringMap.put(2, "2");
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    assertThat(builder.getInt32ToStringField()).isEqualTo(newMap(1, "1"));
    builder.putInt32ToStringField(2, "2");
    assertThat(builder.getInt32ToStringField()).isEqualTo(newMap(1, "1", 2, "2"));
  //
    Map<Integer, TestMap.MessageValue> messageMap = builder.getMutableInt32ToMessageField();
    messageMap.put(1, TestMap.MessageValue.getDefaultInstance());
    assertThat( builder.build().getInt32ToMessageField())
        .isEqualTo(newMap(1, TestMap.MessageValue.getDefaultInstance()));
    try {
      messageMap.put(2, TestMap.MessageValue.getDefaultInstance());
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    assertThat(builder.getInt32ToMessageField())
        .isEqualTo(newMap(1, TestMap.MessageValue.getDefaultInstance()));
    builder.putInt32ToMessageField(2, TestMap.MessageValue.getDefaultInstance());
    assertThat(builder.getInt32ToMessageField()).isEqualTo(
        newMap(1, TestMap.MessageValue.getDefaultInstance(),
            2, TestMap.MessageValue.getDefaultInstance()));
  }
  //
  @Test
  public void testMutableMapLifecycle_collections() {
    TestMap.Builder builder = TestMap.newBuilder();
    Map<Integer, Integer> intMap = builder.getMutableInt32ToInt32Field();
    intMap.put(1, 2);
    assertThat(builder.build().getInt32ToInt32Field()).isEqualTo(newMap(1, 2));
    try {
      intMap.remove(2);
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    try {
      intMap.entrySet().remove(new Object());
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    try {
      intMap.entrySet().iterator().remove();
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    try {
      intMap.keySet().remove(new Object());
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    try {
      intMap.values().remove(new Object());
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    try {
      intMap.values().iterator().remove();
      assertWithMessage("expected exception").fail();
    } catch (UnsupportedOperationException e) {
      // expected
    }
    assertThat(intMap).isEqualTo(newMap(1, 2));
    assertThat(builder.getInt32ToInt32Field()).isEqualTo(newMap(1, 2));
    assertThat(builder.build().getInt32ToInt32Field()).isEqualTo(newMap(1, 2));
  }

  @Test
  public void testGettersAndSetters() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();
    TestMap message = builder.build();
    assertMapValuesCleared(message);

    builder = message.toBuilder();
    setMapValuesUsingAccessors(builder);
    message = builder.build();
    assertMapValuesSet(message);

    builder = message.toBuilder();
    updateMapValuesUsingAccessors(builder);
    message = builder.build();
    assertMapValuesUpdated(message);

    builder = message.toBuilder();
    builder.clear();
    assertMapValuesCleared(builder);
    message = builder.build();
    assertMapValuesCleared(message);
  }

  @Test
  public void testPutAll() throws Exception {
    TestMap.Builder sourceBuilder = TestMap.newBuilder();
    setMapValuesUsingAccessors(sourceBuilder);
    TestMap source = sourceBuilder.build();
    assertMapValuesSet(source);

    TestMap.Builder destination = TestMap.newBuilder();
    copyMapValues(source, destination);
    assertMapValuesSet(destination.build());
  }

  @Test
  public void testPutAllWithNullStringValue() throws Exception {
    TestMap.Builder sourceBuilder = TestMap.newBuilder();

    // order preserving map used here to help test rollback
    Map<Integer, String> data = new TreeMap<>();
    data.put(7, "foo");
    data.put(8, "bar");
    data.put(9, null);
    try {
      sourceBuilder.putAllInt32ToStringField(data);
      fail("allowed null string value");
    } catch (NullPointerException expected) {
      // Verify rollback of previously added values.
      // They all go in or none do.
      assertThat(sourceBuilder.getInt32ToStringFieldMap()).isEmpty();
    }
  }

  @Test
  public void testPutNullStringValue() throws Exception {
    TestMap.Builder sourceBuilder = TestMap.newBuilder();

    try {
      sourceBuilder.putInt32ToStringField(8, null);
      fail("allowed null string value");
    } catch (NullPointerException expected) {
      assertNotNull(expected.getMessage());
    }
  }

  @Test
  public void testPutAllForUnknownEnumValues() throws Exception {
    TestMap source =
        TestMap.newBuilder()
            .putAllInt32ToEnumFieldValue(
                newMap(
                    0, 0,
                    1, 1,
                    2, 1000)) // unknown value.
            .build();

    TestMap destination =
        TestMap.newBuilder()
            .putAllInt32ToEnumFieldValue(source.getInt32ToEnumFieldValueMap())
            .build();

    assertThat(destination.getInt32ToEnumFieldValueMap().get(0).intValue()).isEqualTo(0);
    assertThat(destination.getInt32ToEnumFieldValueMap().get(1).intValue()).isEqualTo(1);
    assertThat(destination.getInt32ToEnumFieldValueMap().get(2).intValue()).isEqualTo(1000);
    assertThat(destination.getInt32ToEnumFieldCount()).isEqualTo(3);
  }

  @Test
  public void testPutForUnknownEnumValues() throws Exception {
    TestMap message =
        TestMap.newBuilder()
            .putInt32ToEnumFieldValue(0, 0)
            .putInt32ToEnumFieldValue(1, 1)
            .putInt32ToEnumFieldValue(2, 1000) // unknown value.
            .build();
    assertThat(message.getInt32ToEnumFieldValueOrThrow(0)).isEqualTo(0);
    assertThat(message.getInt32ToEnumFieldValueOrThrow(1)).isEqualTo(1);
    assertThat(message.getInt32ToEnumFieldValueOrThrow(2)).isEqualTo(1000);
    assertThat(message.getInt32ToEnumFieldCount()).isEqualTo(3);
  }

  @Test
  public void testPutChecksNullKeysAndValues() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();

    try {
      builder.putInt32ToStringField(1, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected.
    }

    try {
      builder.putInt32ToBytesField(1, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected.
    }

    try {
      builder.putInt32ToEnumField(1, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected.
    }

    try {
      builder.putInt32ToMessageField(1, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected.
    }

    try {
      builder.putStringToInt32Field(null, 1);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected.
    }
  }

  @Test
  public void testSerializeAndParse() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    TestMap message = builder.build();
    assertThat(message.toByteString().size()).isEqualTo(message.getSerializedSize());
    message = TestMap.parser().parseFrom(message.toByteString());
    assertMapValuesSet(message);

    builder = message.toBuilder();
    updateMapValuesUsingAccessors(builder);
    message = builder.build();
    assertThat(message.toByteString().size()).isEqualTo(message.getSerializedSize());
    message = TestMap.parser().parseFrom(message.toByteString());
    assertMapValuesUpdated(message);

    builder = message.toBuilder();
    builder.clear();
    message = builder.build();
    assertThat(message.toByteString().size()).isEqualTo(message.getSerializedSize());
    message = TestMap.parser().parseFrom(message.toByteString());
    assertMapValuesCleared(message);
  }

  private TestMap tryParseTestMap(BizarroTestMap bizarroMap) throws IOException {
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    CodedOutputStream output = CodedOutputStream.newInstance(byteArrayOutputStream);
    bizarroMap.writeTo(output);
    output.flush();
    return TestMap.parser().parseFrom(ByteString.copyFrom(byteArrayOutputStream.toByteArray()));
  }

  @Test
  public void testParseError() throws Exception {
    ByteString bytes = TestUtil.toBytes("SOME BYTES");
    String stringKey = "a string key";

    TestMap map =
        tryParseTestMap(BizarroTestMap.newBuilder().putInt32ToInt32Field(5, bytes).build());
    assertThat(map.getInt32ToInt32FieldOrDefault(5, -1)).isEqualTo(0);

    map = tryParseTestMap(BizarroTestMap.newBuilder().putInt32ToStringField(stringKey, 5).build());
    assertThat(map.getInt32ToStringFieldOrDefault(0, null)).isEmpty();

    map = tryParseTestMap(BizarroTestMap.newBuilder().putInt32ToBytesField(stringKey, 5).build());
    assertThat(ByteString.EMPTY).isEqualTo(map.getInt32ToBytesFieldOrDefault(0, null));

    map =
        tryParseTestMap(BizarroTestMap.newBuilder().putInt32ToEnumField(stringKey, bytes).build());
    assertThat(map.getInt32ToEnumFieldOrDefault(0, null)).isEqualTo(TestMap.EnumValue.FOO);

    try {
      tryParseTestMap(BizarroTestMap.newBuilder().putInt32ToMessageField(stringKey, bytes).build());
      assertWithMessage("expected exception").fail();
    } catch (InvalidProtocolBufferException expected) {
      assertThat(expected.getUnfinishedMessage()).isInstanceOf(TestMap.class);
      map = (TestMap) expected.getUnfinishedMessage();
      assertThat(map.getInt32ToMessageFieldMap()).isEmpty();
    }

    map =
        tryParseTestMap(
            BizarroTestMap.newBuilder().putStringToInt32Field(stringKey, bytes).build());
    assertThat(map.getStringToInt32FieldOrDefault(stringKey, -1)).isEqualTo(0);
  }

  @Test
  public void testMergeFrom() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    TestMap message = builder.build();

    TestMap.Builder other = TestMap.newBuilder();
    other.mergeFrom(message);
    assertMapValuesSet(other.build());
  }

  @Test
  public void testEqualsAndHashCode() throws Exception {
    // Test that generated equals() and hashCode() will disregard the order
    // of map entries when comparing/hashing map fields.

    // We can't control the order of elements in a HashMap. The best we can do
    // here is to add elements in different order.
    TestMap m1 =
        TestMap.newBuilder()
            .putInt32ToInt32Field(1, 2)
            .putInt32ToInt32Field(3, 4)
            .putInt32ToInt32Field(5, 6)
            .build();

    TestMap.Builder b2 =
        TestMap.newBuilder()
            .putInt32ToInt32Field(5, 6)
            .putInt32ToInt32Field(1, 2)
            .putInt32ToInt32Field(3, 4);
    TestMap m2 = b2.build();

    assertThat(m2).isEqualTo(m1);
    assertThat(m2.hashCode()).isEqualTo(m1.hashCode());

    // Make sure we did compare map fields.
    b2.putInt32ToInt32Field(1, 0);
    m2 = b2.build();
    assertThat(m1.equals(m2)).isFalse();
    // Don't check m1.hashCode() != m2.hashCode() because it's not guaranteed
    // to be different.

    // Regression test for b/18549190: if a map is a subset of the other map,
    // equals() should return false.
    b2.removeInt32ToInt32Field(1);
    m2 = b2.build();
    assertThat(m1.equals(m2)).isFalse();
    assertThat(m2.equals(m1)).isFalse();
  }

  @Test
  public void testNestedBuilderOnChangeEventPropagation() {
    TestOnChangeEventPropagation.Builder parent = TestOnChangeEventPropagation.newBuilder();
    parent.getOptionalMessageBuilder().putInt32ToInt32Field(1, 2);
    TestOnChangeEventPropagation message = parent.build();
    assertThat(message.getOptionalMessage().getInt32ToInt32FieldMap().get(1).intValue())
        .isEqualTo(2);

    // Make a change using nested builder.
    parent.getOptionalMessageBuilder().putInt32ToInt32Field(1, 3);

    // Should be able to observe the change.
    message = parent.build();
    assertThat(message.getOptionalMessage().getInt32ToInt32FieldMap().get(1).intValue())
        .isEqualTo(3);

    // Make another change using mergeFrom()
    TestMap other = TestMap.newBuilder().putInt32ToInt32Field(1, 4).build();
    parent.getOptionalMessageBuilder().mergeFrom(other);

    // Should be able to observe the change.
    message = parent.build();
    assertThat(message.getOptionalMessage().getInt32ToInt32FieldMap().get(1).intValue())
        .isEqualTo(4);

    // Make yet another change by clearing the nested builder.
    parent.getOptionalMessageBuilder().clear();

    // Should be able to observe the change.
    message = parent.build();
    assertThat(message.getOptionalMessage().getInt32ToInt32FieldMap()).isEmpty();
  }

  @Test
  public void testNestedBuilderOnChangeEventPropagationReflection() {
    FieldDescriptor intMapField = f("int32_to_int32_field");
    // Create an outer message builder with nested builder.
    TestOnChangeEventPropagation.Builder parentBuilder = TestOnChangeEventPropagation.newBuilder();
    TestMap.Builder testMapBuilder = parentBuilder.getOptionalMessageBuilder();

    // Create a map entry message.
    TestMap.Builder entryBuilder = TestMap.newBuilder().putInt32ToInt32Field(1, 1);

    // Put the entry into the nested builder.
    testMapBuilder.addRepeatedField(intMapField, entryBuilder.getRepeatedField(intMapField, 0));

    // Should be able to observe the change.
    TestOnChangeEventPropagation message = parentBuilder.build();
    assertThat(message.getOptionalMessage().getInt32ToInt32FieldMap()).hasSize(1);

    // Change the entry value.
    entryBuilder.putInt32ToInt32Field(1, 4);
    testMapBuilder = parentBuilder.getOptionalMessageBuilder();
    testMapBuilder.setRepeatedField(intMapField, 0, entryBuilder.getRepeatedField(intMapField, 0));

    // Should be able to observe the change.
    message = parentBuilder.build();
    assertThat(message.getOptionalMessage().getInt32ToInt32FieldMap().get(1).intValue())
        .isEqualTo(4);

    // Clear the nested builder.
    testMapBuilder = parentBuilder.getOptionalMessageBuilder();
    testMapBuilder.clearField(intMapField);

    // Should be able to observe the change.
    message = parentBuilder.build();
    assertThat(message.getOptionalMessage().getInt32ToInt32FieldMap()).isEmpty();
  }

  // The following methods are used to test reflection API.

  private static FieldDescriptor f(String name) {
    return TestMap.getDescriptor().findFieldByName(name);
  }

  private static Object getFieldValue(Message mapEntry, String name) {
    FieldDescriptor field = mapEntry.getDescriptorForType().findFieldByName(name);
    return mapEntry.getField(field);
  }

  private static Message.Builder setFieldValue(
      Message.Builder mapEntry, String name, Object value) {
    FieldDescriptor field = mapEntry.getDescriptorForType().findFieldByName(name);
    mapEntry.setField(field, value);
    return mapEntry;
  }

  private static void assertHasMapValues(Message message, String name, Map<?, ?> values) {
    FieldDescriptor field = f(name);
    for (Object entry : (List<?>) message.getField(field)) {
      Message mapEntry = (Message) entry;
      Object key = getFieldValue(mapEntry, "key");
      Object value = getFieldValue(mapEntry, "value");
      assertThat(values.containsKey(key)).isTrue();
      assertThat(values.get(key)).isEqualTo(value);
    }
    assertThat(message.getRepeatedFieldCount(field)).isEqualTo(values.size());
    for (int i = 0; i < message.getRepeatedFieldCount(field); i++) {
      Message mapEntry = (Message) message.getRepeatedField(field, i);
      Object key = getFieldValue(mapEntry, "key");
      Object value = getFieldValue(mapEntry, "value");
      assertThat(values.containsKey(key)).isTrue();
      assertThat(values.get(key)).isEqualTo(value);
    }
  }

  private static <K, V> Message newMapEntry(Message.Builder builder, String name, K key, V value) {
    FieldDescriptor field = builder.getDescriptorForType().findFieldByName(name);
    Message.Builder entryBuilder = builder.newBuilderForField(field);
    FieldDescriptor keyField = entryBuilder.getDescriptorForType().findFieldByName("key");
    FieldDescriptor valueField = entryBuilder.getDescriptorForType().findFieldByName("value");
    entryBuilder.setField(keyField, key);
    entryBuilder.setField(valueField, value);
    return entryBuilder.build();
  }

  private static void setMapValues(Message.Builder builder, String name, Map<?, ?> values) {
    List<Message> entryList = new ArrayList<>();
    for (Map.Entry<?, ?> entry : values.entrySet()) {
      entryList.add(newMapEntry(builder, name, entry.getKey(), entry.getValue()));
    }
    FieldDescriptor field = builder.getDescriptorForType().findFieldByName(name);
    builder.setField(field, entryList);
  }

  private static <K, V> Map<K, V> mapForValues(K key1, V value1, K key2, V value2) {
    Map<K, V> map = new HashMap<>();
    map.put(key1, value1);
    map.put(key2, value2);
    return map;
  }

  @Test
  public void testReflectionApi() throws Exception {
    // In reflection API, map fields are just repeated message fields.
    TestMap.Builder builder =
        TestMap.newBuilder()
            .putInt32ToInt32Field(1, 2)
            .putInt32ToInt32Field(3, 4)
            .putInt32ToMessageField(11, MessageValue.newBuilder().setValue(22).build())
            .putInt32ToMessageField(33, MessageValue.newBuilder().setValue(44).build());
    TestMap message = builder.build();

    // Test getField(), getRepeatedFieldCount(), getRepeatedField().
    assertHasMapValues(message, "int32_to_int32_field", mapForValues(1, 2, 3, 4));
    assertHasMapValues(
        message,
        "int32_to_message_field",
        mapForValues(
            11, MessageValue.newBuilder().setValue(22).build(),
            33, MessageValue.newBuilder().setValue(44).build()));

    // Test clearField()
    builder.clearField(f("int32_to_int32_field"));
    builder.clearField(f("int32_to_message_field"));
    message = builder.build();
    assertThat(message.getInt32ToInt32FieldMap()).isEmpty();
    assertThat(message.getInt32ToMessageFieldMap()).isEmpty();

    // Test setField()
    setMapValues(builder, "int32_to_int32_field", mapForValues(11, 22, 33, 44));
    setMapValues(
        builder,
        "int32_to_message_field",
        mapForValues(
            111, MessageValue.newBuilder().setValue(222).build(),
            333, MessageValue.newBuilder().setValue(444).build()));
    message = builder.build();
    assertThat(message.getInt32ToInt32FieldMap().get(11).intValue()).isEqualTo(22);
    assertThat(message.getInt32ToInt32FieldMap().get(33).intValue()).isEqualTo(44);
    assertThat(message.getInt32ToMessageFieldMap().get(111).getValue()).isEqualTo(222);
    assertThat(message.getInt32ToMessageFieldMap().get(333).getValue()).isEqualTo(444);

    // Test addRepeatedField
    builder.addRepeatedField(
        f("int32_to_int32_field"), newMapEntry(builder, "int32_to_int32_field", 55, 66));
    builder.addRepeatedField(
        f("int32_to_message_field"),
        newMapEntry(
            builder,
            "int32_to_message_field",
            555,
            MessageValue.newBuilder().setValue(666).build()));
    message = builder.build();
    assertThat(message.getInt32ToInt32FieldMap().get(55).intValue()).isEqualTo(66);
    assertThat(message.getInt32ToMessageFieldMap().get(555).getValue()).isEqualTo(666);

    // Test addRepeatedField (overriding existing values)
    builder.addRepeatedField(
        f("int32_to_int32_field"), newMapEntry(builder, "int32_to_int32_field", 55, 55));
    builder.addRepeatedField(
        f("int32_to_message_field"),
        newMapEntry(
            builder,
            "int32_to_message_field",
            555,
            MessageValue.newBuilder().setValue(555).build()));
    message = builder.build();
    assertThat(message.getInt32ToInt32FieldMap().get(55).intValue()).isEqualTo(55);
    assertThat(message.getInt32ToMessageFieldMap().get(555).getValue()).isEqualTo(555);

    // Test setRepeatedField
    for (int i = 0; i < builder.getRepeatedFieldCount(f("int32_to_int32_field")); i++) {
      Message mapEntry = (Message) builder.getRepeatedField(f("int32_to_int32_field"), i);
      int oldKey = ((Integer) getFieldValue(mapEntry, "key")).intValue();
      int oldValue = ((Integer) getFieldValue(mapEntry, "value")).intValue();
      // Swap key with value for each entry.
      Message.Builder mapEntryBuilder = mapEntry.toBuilder();
      setFieldValue(mapEntryBuilder, "key", oldValue);
      setFieldValue(mapEntryBuilder, "value", oldKey);
      builder.setRepeatedField(f("int32_to_int32_field"), i, mapEntryBuilder.build());
    }
    message = builder.build();
    assertThat(message.getInt32ToInt32FieldMap().get(22).intValue()).isEqualTo(11);
    assertThat(message.getInt32ToInt32FieldMap().get(44).intValue()).isEqualTo(33);
    assertThat(message.getInt32ToInt32FieldMap().get(55).intValue()).isEqualTo(55);
  }

  // See additional coverage in TextFormatTest.java.
  @Test
  public void testTextFormat() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    TestMap message = builder.build();

    String textData = TextFormat.printer().printToString(message);

    builder = TestMap.newBuilder();
    TextFormat.merge(textData, builder);
    message = builder.build();

    assertMapValuesSet(message);
  }

  @Test
  public void testDynamicMessage() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    TestMap message = builder.build();

    Message dynamicDefaultInstance = DynamicMessage.getDefaultInstance(TestMap.getDescriptor());
    Message dynamicMessage =
        dynamicDefaultInstance
            .newBuilderForType()
            .mergeFrom(message.toByteString(), ExtensionRegistry.getEmptyRegistry())
            .build();

    assertThat(dynamicMessage).isEqualTo(message);
    assertThat(dynamicMessage.hashCode()).isEqualTo(message.hashCode());
  }

  // Check that DynamicMessage handles map field serialization the same way as generated code
  // regarding unset key and value field in a map entry.
  @Test
  public void testDynamicMessageUnsetKeyAndValue() throws Exception {
    FieldDescriptor field = f("int32_to_int32_field");

    Message dynamicDefaultInstance = DynamicMessage.getDefaultInstance(TestMap.getDescriptor());
    Message.Builder builder = dynamicDefaultInstance.newBuilderForType();
    // Add an entry without key and value.
    builder.addRepeatedField(field, builder.newBuilderForField(field).build());
    Message message = builder.build();
    ByteString bytes = message.toByteString();
    // Parse it back to the same generated type.
    Message generatedMessage = TestMap.parseFrom(bytes, ExtensionRegistry.getEmptyRegistry());
    // Assert the serialized bytes are equivalent.
    assertThat(bytes).isEqualTo(generatedMessage.toByteString());
  }

  @Test
  public void testReflectionEqualsAndHashCode() throws Exception {
    // Test that generated equals() and hashCode() will disregard the order
    // of map entries when comparing/hashing map fields.

    // We use DynamicMessage to test reflection based equals()/hashCode().
    Message dynamicDefaultInstance = DynamicMessage.getDefaultInstance(TestMap.getDescriptor());
    FieldDescriptor field = f("int32_to_int32_field");

    Message.Builder b1 = dynamicDefaultInstance.newBuilderForType();
    b1.addRepeatedField(field, newMapEntry(b1, "int32_to_int32_field", 1, 2));
    b1.addRepeatedField(field, newMapEntry(b1, "int32_to_int32_field", 3, 4));
    b1.addRepeatedField(field, newMapEntry(b1, "int32_to_int32_field", 5, 6));
    Message m1 = b1.build();

    Message.Builder b2 = dynamicDefaultInstance.newBuilderForType();
    b2.addRepeatedField(field, newMapEntry(b2, "int32_to_int32_field", 5, 6));
    b2.addRepeatedField(field, newMapEntry(b2, "int32_to_int32_field", 1, 2));
    b2.addRepeatedField(field, newMapEntry(b2, "int32_to_int32_field", 3, 4));
    Message m2 = b2.build();

    assertThat(m2).isEqualTo(m1);
    assertThat(m2.hashCode()).isEqualTo(m1.hashCode());

    // Make sure we did compare map fields.
    b2.setRepeatedField(field, 0, newMapEntry(b1, "int32_to_int32_field", 0, 0));
    m2 = b2.build();
    assertThat(m1).isNotEqualTo(m2);
    // Don't check m1.hashCode() != m2.hashCode() because it's not guaranteed
    // to be different.
  }

  @Test
  public void testUnknownEnumValues() throws Exception {
    TestMap.Builder builder =
        TestMap.newBuilder()
            .putAllInt32ToEnumFieldValue(
                newMap(
                    0, 0,
                    1, 1,
                    2, 1000)); // unknown value.
    TestMap message = builder.build();

    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(0, TestMap.EnumValue.FOO);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(1, TestMap.EnumValue.BAR);
    assertThat(message.getInt32ToEnumFieldMap()).containsEntry(2, TestMap.EnumValue.UNRECOGNIZED);
    assertThat(message.getInt32ToEnumFieldValueMap().get(2).intValue()).isEqualTo(1000);

    // Unknown enum values should be preserved after:
    //   1. Serialization and parsing.
    //   2. toBuild().
    //   3. mergeFrom().
    message = TestMap.parseFrom(message.toByteString(), ExtensionRegistry.getEmptyRegistry());
    assertThat(message.getInt32ToEnumFieldValueMap().get(2).intValue()).isEqualTo(1000);
    builder = message.toBuilder();
    assertThat(builder.getInt32ToEnumFieldValueMap().get(2).intValue()).isEqualTo(1000);
    builder = TestMap.newBuilder().mergeFrom(message);
    assertThat(builder.getInt32ToEnumFieldValueMap().get(2).intValue()).isEqualTo(1000);

    // hashCode()/equals() should take unknown enum values into account.
    builder.putAllInt32ToEnumFieldValue(newMap(2, 1001));
    TestMap message2 = builder.build();
    assertThat(message.hashCode()).isNotEqualTo(message2.hashCode());
    assertThat(message.equals(message2)).isFalse();
    // Unknown values will be converted to UNRECOGNIZED so the resulted enum map
    // should be the same.
    assertThat(message.getInt32ToEnumFieldMap()).isEqualTo(message2.getInt32ToEnumFieldMap());
  }

  @Test
  public void testUnknownEnumValuesInReflectionApi() throws Exception {
    Descriptor descriptor = TestMap.getDescriptor();
    EnumDescriptor enumDescriptor = TestMap.EnumValue.getDescriptor();
    FieldDescriptor field = descriptor.findFieldByName("int32_to_enum_field");

    Map<Integer, Integer> data =
        newMap(
            0, 0,
            1, 1,
            2, 1000); // unknown value

    TestMap.Builder builder = TestMap.newBuilder().putAllInt32ToEnumFieldValue(data);

    // Try to read unknown enum values using reflection API.
    for (int i = 0; i < builder.getRepeatedFieldCount(field); i++) {
      Message mapEntry = (Message) builder.getRepeatedField(field, i);
      int key = ((Integer) getFieldValue(mapEntry, "key")).intValue();
      int value = ((EnumValueDescriptor) getFieldValue(mapEntry, "value")).getNumber();
      assertThat(value).isEqualTo(data.get(key).intValue());
      Message.Builder mapEntryBuilder = mapEntry.toBuilder();
      // Increase the value by 1.
      setFieldValue(
          mapEntryBuilder, "value", enumDescriptor.findValueByNumberCreatingIfUnknown(value + 1));
      builder.setRepeatedField(field, i, mapEntryBuilder.build());
    }

    // Verify that enum values have been successfully updated.
    TestMap message = builder.build();
    for (Map.Entry<Integer, Integer> entry : message.getInt32ToEnumFieldValueMap().entrySet()) {
      assertThat(entry.getValue().intValue()).isEqualTo(data.get(entry.getKey()) + 1);
    }
  }

  @Test
  public void testIterationOrder() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    TestMap message = builder.build();

    assertThat(new ArrayList<>(message.getStringToInt32FieldMap().keySet()))
        .containsExactly("1", "2", "3")
        .inOrder();
  }

  @Test
  public void testGetMap() {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    TestMap message = builder.build();
    assertThat(message.getStringToInt32FieldMap()).isEqualTo(message.getStringToInt32FieldMap());
    assertThat(message.getInt32ToBytesFieldMap()).isEqualTo(message.getInt32ToBytesFieldMap());
    assertThat(message.getInt32ToEnumFieldMap()).isEqualTo(message.getInt32ToEnumFieldMap());
    assertThat(message.getInt32ToEnumFieldValueMap())
        .isEqualTo(message.getInt32ToEnumFieldValueMap());
    assertThat(message.getInt32ToMessageFieldMap()).isEqualTo(message.getInt32ToMessageFieldMap());
  }

  @Test
  public void testContains() {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    assertMapContainsSetValues(builder);
    assertMapContainsSetValues(builder.build());
  }

  private void assertMapContainsSetValues(TestMapOrBuilder testMapOrBuilder) {
    assertThat(testMapOrBuilder.containsInt32ToInt32Field(1)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToInt32Field(2)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToInt32Field(3)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToInt32Field(-1)).isFalse();

    assertThat(testMapOrBuilder.containsInt32ToStringField(1)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToStringField(2)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToStringField(3)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToStringField(-1)).isFalse();

    assertThat(testMapOrBuilder.containsInt32ToBytesField(1)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToBytesField(2)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToBytesField(3)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToBytesField(-1)).isFalse();

    assertThat(testMapOrBuilder.containsInt32ToEnumField(1)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToEnumField(2)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToEnumField(3)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToEnumField(-1)).isFalse();

    assertThat(testMapOrBuilder.containsInt32ToMessageField(1)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToMessageField(2)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToMessageField(3)).isTrue();
    assertThat(testMapOrBuilder.containsInt32ToMessageField(-1)).isFalse();

    assertThat(testMapOrBuilder.containsStringToInt32Field("1")).isTrue();
    assertThat(testMapOrBuilder.containsStringToInt32Field("2")).isTrue();
    assertThat(testMapOrBuilder.containsStringToInt32Field("3")).isTrue();
    assertThat(testMapOrBuilder.containsStringToInt32Field("-1")).isFalse();
  }

  @Test
  public void testCount() {
    TestMap.Builder builder = TestMap.newBuilder();
    assertMapCounts(0, builder);

    setMapValuesUsingAccessors(builder);
    assertMapCounts(3, builder);

    TestMap message = builder.build();
    assertMapCounts(3, message);

    builder = message.toBuilder().putInt32ToInt32Field(4, 44);
    assertThat(builder.getInt32ToInt32FieldCount()).isEqualTo(4);
    assertThat(builder.build().getInt32ToInt32FieldCount()).isEqualTo(4);

    // already present - should be unchanged
    builder.putInt32ToInt32Field(4, 44);
    assertThat(builder.getInt32ToInt32FieldCount()).isEqualTo(4);
  }

  private void assertMapCounts(int expectedCount, TestMapOrBuilder testMapOrBuilder) {
    assertThat(testMapOrBuilder.getInt32ToInt32FieldCount()).isEqualTo(expectedCount);
    assertThat(testMapOrBuilder.getInt32ToStringFieldCount()).isEqualTo(expectedCount);
    assertThat(testMapOrBuilder.getInt32ToBytesFieldCount()).isEqualTo(expectedCount);
    assertThat(testMapOrBuilder.getInt32ToEnumFieldCount()).isEqualTo(expectedCount);
    assertThat(testMapOrBuilder.getInt32ToMessageFieldCount()).isEqualTo(expectedCount);
    assertThat(testMapOrBuilder.getStringToInt32FieldCount()).isEqualTo(expectedCount);
  }

  @Test
  public void testGetOrDefault() {
    TestMap.Builder builder = TestMap.newBuilder();
    assertMapCounts(0, builder);
    setMapValuesUsingAccessors(builder);
    doTestGetOrDefault(builder);
    doTestGetOrDefault(builder.build());
  }

  public void doTestGetOrDefault(TestMapOrBuilder testMapOrBuilder) {
    assertThat(testMapOrBuilder.getInt32ToInt32FieldOrDefault(1, -11)).isEqualTo(11);
    assertThat(testMapOrBuilder.getInt32ToInt32FieldOrDefault(-1, -11)).isEqualTo(-11);

    assertThat(testMapOrBuilder.getInt32ToStringFieldOrDefault(1, "-11")).isEqualTo("11");
    assertWithMessage("-11")
        .that(testMapOrBuilder.getInt32ToStringFieldOrDefault(-1, null))
        .isNull();

    assertThat(testMapOrBuilder.getInt32ToBytesFieldOrDefault(1, null))
        .isEqualTo(TestUtil.toBytes("11"));
    assertThat(testMapOrBuilder.getInt32ToBytesFieldOrDefault(-1, null)).isNull();

    assertThat(testMapOrBuilder.getInt32ToEnumFieldOrDefault(1, null))
        .isEqualTo(TestMap.EnumValue.FOO);
    assertThat(testMapOrBuilder.getInt32ToEnumFieldOrDefault(-1, null)).isNull();

    assertThat(testMapOrBuilder.getInt32ToEnumFieldValueOrDefault(2, -1))
        .isEqualTo(TestMap.EnumValue.BAR.getNumber());
    assertThat(testMapOrBuilder.getInt32ToEnumFieldValueOrDefault(-1000, -1)).isEqualTo(-1);

    assertThat(testMapOrBuilder.getInt32ToMessageFieldOrDefault(1, null))
        .isEqualTo(MessageValue.newBuilder().setValue(11).build());
    assertThat(testMapOrBuilder.getInt32ToMessageFieldOrDefault(-1, null)).isNull();

    assertThat(testMapOrBuilder.getStringToInt32FieldOrDefault("1", -11)).isEqualTo(11);
    assertThat(testMapOrBuilder.getStringToInt32FieldOrDefault("-1", -11)).isEqualTo(-11);

    try {
      testMapOrBuilder.getStringToInt32FieldOrDefault(null, -11);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected
    }
  }

  @Test
  public void testGetOrThrow() {
    TestMap.Builder builder = TestMap.newBuilder();
    assertMapCounts(0, builder);
    setMapValuesUsingAccessors(builder);
    doTestGetOrDefault(builder);
    doTestGetOrDefault(builder.build());
  }

  public void doTestGetOrThrow(TestMapOrBuilder testMapOrBuilder) {
    assertThat(testMapOrBuilder.getInt32ToInt32FieldOrThrow(1)).isEqualTo(11);
    try {
      testMapOrBuilder.getInt32ToInt32FieldOrThrow(-1);
      assertWithMessage("expected exception").fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertThat(testMapOrBuilder.getInt32ToStringFieldOrThrow(1)).isEqualTo("11");

    try {
      testMapOrBuilder.getInt32ToStringFieldOrThrow(-1);
      assertWithMessage("expected exception").fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertThat(testMapOrBuilder.getInt32ToBytesFieldOrThrow(1)).isEqualTo(TestUtil.toBytes("11"));

    try {
      testMapOrBuilder.getInt32ToBytesFieldOrThrow(-1);
      assertWithMessage("expected exception").fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertThat(testMapOrBuilder.getInt32ToEnumFieldOrThrow(1)).isEqualTo(TestMap.EnumValue.FOO);
    try {
      testMapOrBuilder.getInt32ToEnumFieldOrThrow(-1);
      assertWithMessage("expected exception").fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertThat(testMapOrBuilder.getInt32ToEnumFieldValueOrThrow(2))
        .isEqualTo(TestMap.EnumValue.BAR.getNumber());
    try {
      testMapOrBuilder.getInt32ToEnumFieldValueOrThrow(-1);
      assertWithMessage("expected exception").fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertThat(testMapOrBuilder.getInt32ToMessageFieldOrThrow(1))
        .isEqualTo(MessageValue.newBuilder().setValue(11).build());
    try {
      testMapOrBuilder.getInt32ToMessageFieldOrThrow(-1);
      assertWithMessage("expected exception").fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertThat(testMapOrBuilder.getStringToInt32FieldOrThrow("1")).isEqualTo(11);
    try {
      testMapOrBuilder.getStringToInt32FieldOrThrow("-1");
      assertWithMessage("expected exception").fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    try {
      testMapOrBuilder.getStringToInt32FieldOrThrow(null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected
    }
  }

  @Test
  public void testPut() {
    TestMap.Builder builder = TestMap.newBuilder();
    builder.putInt32ToInt32Field(1, 11);
    assertThat(builder.getInt32ToInt32FieldOrThrow(1)).isEqualTo(11);

    builder.putInt32ToStringField(1, "a");
    assertThat(builder.getInt32ToStringFieldOrThrow(1)).isEqualTo("a");
    try {
      builder.putInt32ToStringField(1, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected
    }

    builder.putInt32ToBytesField(1, TestUtil.toBytes("11"));
    assertThat(builder.getInt32ToBytesFieldOrThrow(1)).isEqualTo(TestUtil.toBytes("11"));
    try {
      builder.putInt32ToBytesField(1, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected
    }

    builder.putInt32ToEnumField(1, TestMap.EnumValue.FOO);
    assertThat(builder.getInt32ToEnumFieldOrThrow(1)).isEqualTo(TestMap.EnumValue.FOO);
    try {
      builder.putInt32ToEnumField(1, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected
    }

    builder.putInt32ToEnumFieldValue(1, TestMap.EnumValue.BAR.getNumber());
    assertThat(builder.getInt32ToEnumFieldValueOrThrow(1))
        .isEqualTo(TestMap.EnumValue.BAR.getNumber());
    builder.putInt32ToEnumFieldValue(1, -1);
    assertThat(builder.getInt32ToEnumFieldValueOrThrow(1)).isEqualTo(-1);
    assertThat(builder.getInt32ToEnumFieldOrThrow(1)).isEqualTo(TestMap.EnumValue.UNRECOGNIZED);

    builder.putStringToInt32Field("a", 1);
    assertThat(builder.getStringToInt32FieldOrThrow("a")).isEqualTo(1);
    try {
      builder.putStringToInt32Field(null, -1);
    } catch (NullPointerException e) {
      // expected
    }
  }

  @Test
  public void testRemove() {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    assertThat(builder.getInt32ToInt32FieldOrThrow(1)).isEqualTo(11);
    for (int times = 0; times < 2; times++) {
      builder.removeInt32ToInt32Field(1);
      assertThat(builder.getInt32ToInt32FieldOrDefault(1, -1)).isEqualTo(-1);
    }

    assertThat(builder.getInt32ToStringFieldOrThrow(1)).isEqualTo("11");
    for (int times = 0; times < 2; times++) {
      builder.removeInt32ToStringField(1);
      assertThat(builder.getInt32ToStringFieldOrDefault(1, null)).isNull();
    }

    assertThat(builder.getInt32ToBytesFieldOrThrow(1)).isEqualTo(TestUtil.toBytes("11"));
    for (int times = 0; times < 2; times++) {
      builder.removeInt32ToBytesField(1);
      assertThat(builder.getInt32ToBytesFieldOrDefault(1, null)).isNull();
    }

    assertThat(builder.getInt32ToEnumFieldOrThrow(1)).isEqualTo(TestMap.EnumValue.FOO);
    for (int times = 0; times < 2; times++) {
      builder.removeInt32ToEnumField(1);
      assertThat(builder.getInt32ToEnumFieldOrDefault(1, null)).isNull();
    }

    assertThat(builder.getStringToInt32FieldOrThrow("1")).isEqualTo(11);
    for (int times = 0; times < 2; times++) {
      builder.removeStringToInt32Field("1");
      assertThat(builder.getStringToInt32FieldOrDefault("1", -1)).isEqualTo(-1);
    }

    try {
      builder.removeStringToInt32Field(null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException e) {
      // expected
    }
  }

  @Test
  public void testReservedWordsFieldNames() {
    ReservedAsMapField unused1 = ReservedAsMapField.getDefaultInstance();
    ReservedAsMapFieldWithEnumValue unused2 = ReservedAsMapFieldWithEnumValue.getDefaultInstance();
  }

  @Test
  public void testDeterministicSerialization() throws Exception {
    TestMap.Builder builder = TestMap.newBuilder();
    // int32->int32
    builder.putInt32ToInt32Field(5, 1);
    builder.putInt32ToInt32Field(1, 1);
    builder.putInt32ToInt32Field(4, 1);
    builder.putInt32ToInt32Field(-2, 1);
    builder.putInt32ToInt32Field(0, 1);

    // uint32->int32
    builder.putUint32ToInt32Field(5, 1);
    builder.putUint32ToInt32Field(1, 1);
    builder.putUint32ToInt32Field(4, 1);
    builder.putUint32ToInt32Field(-2, 1);
    builder.putUint32ToInt32Field(0, 1);

    // int64->int32
    builder.putInt64ToInt32Field(5L, 1);
    builder.putInt64ToInt32Field(1L, 1);
    builder.putInt64ToInt32Field(4L, 1);
    builder.putInt64ToInt32Field(-2L, 1);
    builder.putInt64ToInt32Field(0L, 1);

    // string->int32
    builder.putStringToInt32Field("baz", 1);
    builder.putStringToInt32Field("foo", 1);
    builder.putStringToInt32Field("bar", 1);
    builder.putStringToInt32Field("", 1);
    builder.putStringToInt32Field("hello", 1);
    builder.putStringToInt32Field("world", 1);

    TestMap message = builder.build();
    byte[] serialized = new byte[message.getSerializedSize()];
    CodedOutputStream output = CodedOutputStream.newInstance(serialized);
    output.useDeterministicSerialization();
    message.writeTo(output);
    output.flush();

    CodedInputStream input = CodedInputStream.newInstance(serialized);
    List<Integer> int32Keys = new ArrayList<>();
    List<Integer> uint32Keys = new ArrayList<>();
    List<Long> int64Keys = new ArrayList<>();
    List<String> stringKeys = new ArrayList<>();
    int tag;
    while (true) {
      tag = input.readTag();
      if (tag == 0) {
        break;
      }
      int length = input.readRawVarint32();
      int oldLimit = input.pushLimit(length);
      switch (WireFormat.getTagFieldNumber(tag)) {
        case TestMap.STRING_TO_INT32_FIELD_FIELD_NUMBER:
          stringKeys.add(readMapStringKey(input));
          break;
        case TestMap.INT32_TO_INT32_FIELD_FIELD_NUMBER:
          int32Keys.add(readMapIntegerKey(input));
          break;
        case TestMap.UINT32_TO_INT32_FIELD_FIELD_NUMBER:
          uint32Keys.add(readMapIntegerKey(input));
          break;
        case TestMap.INT64_TO_INT32_FIELD_FIELD_NUMBER:
          int64Keys.add(readMapLongKey(input));
          break;
        default:
          assertWithMessage("Unexpected fields.").fail();
      }
      input.popLimit(oldLimit);
    }
    assertThat(int32Keys).containsExactly(-2, 0, 1, 4, 5).inOrder();
    assertThat(uint32Keys).containsExactly(-2, 0, 1, 4, 5).inOrder();
    assertThat(int64Keys).containsExactly(-2L, 0L, 1L, 4L, 5L).inOrder();
    assertThat(stringKeys).containsExactly("", "bar", "baz", "foo", "hello", "world").inOrder();
  }

  @Test
  public void testInitFromPartialDynamicMessage() {
    FieldDescriptor fieldDescriptor =
        TestMap.getDescriptor().findFieldByNumber(TestMap.INT32_TO_MESSAGE_FIELD_FIELD_NUMBER);
    Descriptor mapEntryType = fieldDescriptor.getMessageType();
    FieldDescriptor keyField = mapEntryType.findFieldByNumber(1);
    FieldDescriptor valueField = mapEntryType.findFieldByNumber(2);
    DynamicMessage dynamicMessage =
        DynamicMessage.newBuilder(TestMap.getDescriptor())
            .addRepeatedField(
                fieldDescriptor,
                DynamicMessage.newBuilder(mapEntryType)
                    .setField(keyField, 10)
                    .setField(valueField, TestMap.MessageValue.newBuilder().setValue(10).build())
                    .build())
            .build();
    TestMap message = TestMap.newBuilder().mergeFrom(dynamicMessage).build();
    assertThat(message.getInt32ToMessageFieldMap())
        .containsEntry(10, TestMap.MessageValue.newBuilder().setValue(10).build());
  }

  @Test
  public void testInitFromFullyDynamicMessage() {
    FieldDescriptor fieldDescriptor =
        TestMap.getDescriptor().findFieldByNumber(TestMap.INT32_TO_MESSAGE_FIELD_FIELD_NUMBER);
    Descriptor mapEntryType = fieldDescriptor.getMessageType();
    FieldDescriptor keyField = mapEntryType.findFieldByNumber(1);
    FieldDescriptor valueField = mapEntryType.findFieldByNumber(2);
    DynamicMessage dynamicMessage =
        DynamicMessage.newBuilder(TestMap.getDescriptor())
            .addRepeatedField(
                fieldDescriptor,
                DynamicMessage.newBuilder(mapEntryType)
                    .setField(keyField, 10)
                    .setField(
                        valueField,
                        DynamicMessage.newBuilder(TestMap.MessageValue.getDescriptor())
                            .setField(
                                TestMap.MessageValue.getDescriptor().findFieldByName("value"), 10)
                            .build())
                    .build())
            .build();
    TestMap message = TestMap.newBuilder().mergeFrom(dynamicMessage).build();
    assertThat(message.getInt32ToMessageFieldMap())
        .containsEntry(10, TestMap.MessageValue.newBuilder().setValue(10).build());
  }

  private int readMapIntegerKey(CodedInputStream input) throws IOException {
    int tag = input.readTag();
    assertThat(tag).isEqualTo(WireFormat.makeTag(1, WireFormat.WIRETYPE_VARINT));
    int ret = input.readInt32();
    // skip the value field.
    input.skipField(input.readTag());
    assertThat(input.isAtEnd()).isTrue();
    return ret;
  }

  private long readMapLongKey(CodedInputStream input) throws IOException {
    int tag = input.readTag();
    assertThat(tag).isEqualTo(WireFormat.makeTag(1, WireFormat.WIRETYPE_VARINT));
    long ret = input.readInt64();
    // skip the value field.
    input.skipField(input.readTag());
    assertThat(input.isAtEnd()).isTrue();
    return ret;
  }

  private String readMapStringKey(CodedInputStream input) throws IOException {
    int tag = input.readTag();
    assertThat(tag).isEqualTo(WireFormat.makeTag(1, WireFormat.WIRETYPE_LENGTH_DELIMITED));
    String ret = input.readString();
    // skip the value field.
    input.skipField(input.readTag());
    assertThat(input.isAtEnd()).isTrue();
    return ret;
  }

  private static <K, V> Map<K, V> newMap(K key1, V value1) {
    Map<K, V> map = new HashMap<>();
    map.put(key1, value1);
    return map;
  }

  private static <K, V> Map<K, V> newMap(K key1, V value1, K key2, V value2) {
    Map<K, V> map = new HashMap<>();
    map.put(key1, value1);
    map.put(key2, value2);
    return map;
  }

  private static <K, V> Map<K, V> newMap(K key1, V value1, K key2, V value2, K key3, V value3) {
    Map<K, V> map = new HashMap<>();
    map.put(key1, value1);
    map.put(key2, value2);
    map.put(key3, value3);
    return map;
  }

  @Test
  public void testMap_withNulls() {
    TestMap.Builder builder = TestMap.newBuilder();

    try {
      builder.putStringToInt32Field(null, 3);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException expected) {
    }

    try {
      builder.putAllStringToInt32Field(newMap(null, 3, "hi", 4));
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException expected) {
    }

    try {
      builder.putInt32ToMessageField(3, null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException expected) {
    }

    try {
      builder.putAllInt32ToMessageField(MapTest.<Integer, MessageValue>newMap(4, null, 5, null));
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException expected) {
    }

    try {
      builder.putAllInt32ToMessageField(null);
      assertWithMessage("expected exception").fail();
    } catch (NullPointerException expected) {
    }

    assertThat(builder.build().toByteArray()).isEqualTo(new byte[0]);
  }
}
