// 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:
//
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// notice, this list of conditions and the following disclaimer.
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// 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
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package com.google.protobuf;

import static org.junit.Assert.assertArrayEquals;

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.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import junit.framework.TestCase;

/** Unit tests for map fields. */
public class MapTest extends TestCase {

  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);
  }

  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);

    assertEquals(usingAccessors, usingMutableMap);
  }

  private void copyMapValues(TestMap source, TestMap.Builder destination) {
    destination
        .putAllInt32ToInt32Field(source.getInt32ToInt32Field())
        .putAllInt32ToStringField(source.getInt32ToStringField())
        .putAllInt32ToBytesField(source.getInt32ToBytesField())
        .putAllInt32ToEnumField(source.getInt32ToEnumField())
        .putAllInt32ToMessageField(source.getInt32ToMessageField())
        .putAllStringToInt32Field(source.getStringToInt32Field());
  }

  private void assertMapValuesSet(TestMap message) {
    assertEquals(3, message.getInt32ToInt32Field().size());
    assertEquals(11, message.getInt32ToInt32Field().get(1).intValue());
    assertEquals(22, message.getInt32ToInt32Field().get(2).intValue());
    assertEquals(33, message.getInt32ToInt32Field().get(3).intValue());

    assertEquals(3, message.getInt32ToStringField().size());
    assertEquals("11", message.getInt32ToStringField().get(1));
    assertEquals("22", message.getInt32ToStringField().get(2));
    assertEquals("33", message.getInt32ToStringField().get(3));

    assertEquals(3, message.getInt32ToBytesField().size());
    assertEquals(TestUtil.toBytes("11"), message.getInt32ToBytesField().get(1));
    assertEquals(TestUtil.toBytes("22"), message.getInt32ToBytesField().get(2));
    assertEquals(TestUtil.toBytes("33"), message.getInt32ToBytesField().get(3));

    assertEquals(3, message.getInt32ToEnumField().size());
    assertEquals(TestMap.EnumValue.FOO, message.getInt32ToEnumField().get(1));
    assertEquals(TestMap.EnumValue.BAR, message.getInt32ToEnumField().get(2));
    assertEquals(TestMap.EnumValue.BAZ, message.getInt32ToEnumField().get(3));

    assertEquals(3, message.getInt32ToMessageField().size());
    assertEquals(11, message.getInt32ToMessageField().get(1).getValue());
    assertEquals(22, message.getInt32ToMessageField().get(2).getValue());
    assertEquals(33, message.getInt32ToMessageField().get(3).getValue());

    assertEquals(3, message.getStringToInt32Field().size());
    assertEquals(11, message.getStringToInt32Field().get("1").intValue());
    assertEquals(22, message.getStringToInt32Field().get("2").intValue());
    assertEquals(33, message.getStringToInt32Field().get("3").intValue());
  }

  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);
  }

  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);

    assertEquals(usingAccessors, usingMutableMap);
    //
    usingMutableMapBuilder = usingMutableMap.toBuilder();
    updateMapValuesUsingMutableMap(usingMutableMapBuilder);
    usingMutableMap = usingMutableMapBuilder.build();
    assertMapValuesUpdated(usingMutableMap);

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

    assertEquals(usingAccessors, usingMutableMap);
  }

  private void assertMapValuesUpdated(TestMap message) {
    assertEquals(3, message.getInt32ToInt32Field().size());
    assertEquals(111, message.getInt32ToInt32Field().get(1).intValue());
    assertEquals(33, message.getInt32ToInt32Field().get(3).intValue());
    assertEquals(44, message.getInt32ToInt32Field().get(4).intValue());

    assertEquals(3, message.getInt32ToStringField().size());
    assertEquals("111", message.getInt32ToStringField().get(1));
    assertEquals("33", message.getInt32ToStringField().get(3));
    assertEquals("44", message.getInt32ToStringField().get(4));

    assertEquals(3, message.getInt32ToBytesField().size());
    assertEquals(TestUtil.toBytes("111"), message.getInt32ToBytesField().get(1));
    assertEquals(TestUtil.toBytes("33"), message.getInt32ToBytesField().get(3));
    assertEquals(TestUtil.toBytes("44"), message.getInt32ToBytesField().get(4));

    assertEquals(3, message.getInt32ToEnumField().size());
    assertEquals(TestMap.EnumValue.BAR, message.getInt32ToEnumField().get(1));
    assertEquals(TestMap.EnumValue.BAZ, message.getInt32ToEnumField().get(3));
    assertEquals(TestMap.EnumValue.QUX, message.getInt32ToEnumField().get(4));

    assertEquals(3, message.getInt32ToMessageField().size());
    assertEquals(111, message.getInt32ToMessageField().get(1).getValue());
    assertEquals(33, message.getInt32ToMessageField().get(3).getValue());
    assertEquals(44, message.getInt32ToMessageField().get(4).getValue());

    assertEquals(3, message.getStringToInt32Field().size());
    assertEquals(111, message.getStringToInt32Field().get("1").intValue());
    assertEquals(33, message.getStringToInt32Field().get("3").intValue());
    assertEquals(44, message.getStringToInt32Field().get("4").intValue());
  }

  private void assertMapValuesCleared(TestMapOrBuilder testMapOrBuilder) {
    assertEquals(0, testMapOrBuilder.getInt32ToInt32Field().size());
    assertEquals(0, testMapOrBuilder.getInt32ToInt32FieldCount());
    assertEquals(0, testMapOrBuilder.getInt32ToStringField().size());
    assertEquals(0, testMapOrBuilder.getInt32ToStringFieldCount());
    assertEquals(0, testMapOrBuilder.getInt32ToBytesField().size());
    assertEquals(0, testMapOrBuilder.getInt32ToBytesFieldCount());
    assertEquals(0, testMapOrBuilder.getInt32ToEnumField().size());
    assertEquals(0, testMapOrBuilder.getInt32ToEnumFieldCount());
    assertEquals(0, testMapOrBuilder.getInt32ToMessageField().size());
    assertEquals(0, testMapOrBuilder.getInt32ToMessageFieldCount());
    assertEquals(0, testMapOrBuilder.getStringToInt32Field().size());
    assertEquals(0, testMapOrBuilder.getStringToInt32FieldCount());
  }

  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.getInt32ToInt32Field(), 1, 2);
    assertImmutable(testMapOrBuilder.getInt32ToStringField(), 1, "2");
    assertImmutable(testMapOrBuilder.getInt32ToBytesField(), 1, TestUtil.toBytes("2"));
    assertImmutable(testMapOrBuilder.getInt32ToEnumField(), 1, TestMap.EnumValue.FOO);
    assertImmutable(
        testMapOrBuilder.getInt32ToMessageField(), 1, MessageValue.getDefaultInstance());
    assertImmutable(testMapOrBuilder.getStringToInt32Field(), "1", 2);
  }

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

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

  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);
  }

  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());
  }

  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.getInt32ToEnumFieldValue()).build();

    assertEquals(0, destination.getInt32ToEnumFieldValue().get(0).intValue());
    assertEquals(1, destination.getInt32ToEnumFieldValue().get(1).intValue());
    assertEquals(1000, destination.getInt32ToEnumFieldValue().get(2).intValue());
    assertEquals(3, destination.getInt32ToEnumFieldCount());
  }

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

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

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

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

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

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

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

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

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

    builder = message.toBuilder();
    builder.clear();
    message = builder.build();
    assertEquals(message.getSerializedSize(), message.toByteString().size());
    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()));
  }

  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());
    assertEquals(0, map.getInt32ToInt32FieldOrDefault(5, -1));

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

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

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

    try {
      tryParseTestMap(BizarroTestMap.newBuilder().putInt32ToMessageField(stringKey, bytes).build());
      fail();
    } catch (InvalidProtocolBufferException expected) {
      assertTrue(expected.getUnfinishedMessage() instanceof TestMap);
      map = (TestMap) expected.getUnfinishedMessage();
      assertTrue(map.getInt32ToMessageField().isEmpty());
    }

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

  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());
  }

  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();

    assertEquals(m1, m2);
    assertEquals(m1.hashCode(), m2.hashCode());

    // Make sure we did compare map fields.
    b2.putInt32ToInt32Field(1, 0);
    m2 = b2.build();
    assertFalse(m1.equals(m2));
    // 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();
    assertFalse(m1.equals(m2));
    assertFalse(m2.equals(m1));
  }

  public void testNestedBuilderOnChangeEventPropagation() {
    TestOnChangeEventPropagation.Builder parent = TestOnChangeEventPropagation.newBuilder();
    parent.getOptionalMessageBuilder().putInt32ToInt32Field(1, 2);
    TestOnChangeEventPropagation message = parent.build();
    assertEquals(2, message.getOptionalMessage().getInt32ToInt32Field().get(1).intValue());

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

    // Should be able to observe the change.
    message = parent.build();
    assertEquals(3, message.getOptionalMessage().getInt32ToInt32Field().get(1).intValue());

    // 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();
    assertEquals(4, message.getOptionalMessage().getInt32ToInt32Field().get(1).intValue());

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

    // Should be able to observe the change.
    message = parent.build();
    assertEquals(0, message.getOptionalMessage().getInt32ToInt32Field().size());
  }

  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();
    assertEquals(1, message.getOptionalMessage().getInt32ToInt32Field().size());

    // 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();
    assertEquals(4, message.getOptionalMessage().getInt32ToInt32Field().get(1).intValue());

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

    // Should be able to observe the change.
    message = parentBuilder.build();
    assertEquals(0, message.getOptionalMessage().getInt32ToInt32Field().size());
  }

  // 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");
      assertTrue(values.containsKey(key));
      assertEquals(value, values.get(key));
    }
    assertEquals(values.size(), message.getRepeatedFieldCount(field));
    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");
      assertTrue(values.containsKey(key));
      assertEquals(value, values.get(key));
    }
  }

  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;
  }

  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();
    assertEquals(0, message.getInt32ToInt32Field().size());
    assertEquals(0, message.getInt32ToMessageField().size());

    // 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();
    assertEquals(22, message.getInt32ToInt32Field().get(11).intValue());
    assertEquals(44, message.getInt32ToInt32Field().get(33).intValue());
    assertEquals(222, message.getInt32ToMessageField().get(111).getValue());
    assertEquals(444, message.getInt32ToMessageField().get(333).getValue());

    // 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();
    assertEquals(66, message.getInt32ToInt32Field().get(55).intValue());
    assertEquals(666, message.getInt32ToMessageField().get(555).getValue());

    // 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();
    assertEquals(55, message.getInt32ToInt32Field().get(55).intValue());
    assertEquals(555, message.getInt32ToMessageField().get(555).getValue());

    // 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();
    assertEquals(11, message.getInt32ToInt32Field().get(22).intValue());
    assertEquals(33, message.getInt32ToInt32Field().get(44).intValue());
    assertEquals(55, message.getInt32ToInt32Field().get(55).intValue());
  }

  // See additional coverage in TextFormatTest.java.
  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);
  }

  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()).build();

    assertEquals(message, dynamicMessage);
    assertEquals(message.hashCode(), dynamicMessage.hashCode());
  }

  // Check that DynamicMessage handles map field serialization the same way as generated code
  // regarding unset key and value field in a map entry.
  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);
    // Assert the serialized bytes are equivalent.
    assertEquals(generatedMessage.toByteString(), bytes);
  }

  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();

    assertEquals(m1, m2);
    assertEquals(m1.hashCode(), m2.hashCode());

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

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

    assertEquals(TestMap.EnumValue.FOO, message.getInt32ToEnumField().get(0));
    assertEquals(TestMap.EnumValue.BAR, message.getInt32ToEnumField().get(1));
    assertEquals(TestMap.EnumValue.UNRECOGNIZED, message.getInt32ToEnumField().get(2));
    assertEquals(1000, message.getInt32ToEnumFieldValue().get(2).intValue());

    // Unknown enum values should be preserved after:
    //   1. Serialization and parsing.
    //   2. toBuild().
    //   3. mergeFrom().
    message = TestMap.parseFrom(message.toByteString());
    assertEquals(1000, message.getInt32ToEnumFieldValue().get(2).intValue());
    builder = message.toBuilder();
    assertEquals(1000, builder.getInt32ToEnumFieldValue().get(2).intValue());
    builder = TestMap.newBuilder().mergeFrom(message);
    assertEquals(1000, builder.getInt32ToEnumFieldValue().get(2).intValue());

    // hashCode()/equals() should take unknown enum values into account.
    builder.putAllInt32ToEnumFieldValue(newMap(2, 1001));
    TestMap message2 = builder.build();
    assertFalse(message.hashCode() == message2.hashCode());
    assertFalse(message.equals(message2));
    // Unknown values will be converted to UNRECOGNIZED so the resulted enum map
    // should be the same.
    assertEquals(message2.getInt32ToEnumField(), message.getInt32ToEnumField());
  }

  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();
      assertEquals(data.get(key).intValue(), value);
      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.getInt32ToEnumFieldValue().entrySet()) {
      assertEquals(data.get(entry.getKey()) + 1, entry.getValue().intValue());
    }
  }

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

    assertEquals(
        Arrays.asList("1", "2", "3"), new ArrayList<>(message.getStringToInt32Field().keySet()));
  }

  public void testGetMap() {
    TestMap.Builder builder = TestMap.newBuilder();
    setMapValuesUsingAccessors(builder);
    TestMap message = builder.build();
    assertEquals(message.getStringToInt32Field(), message.getStringToInt32FieldMap());
    assertEquals(message.getInt32ToBytesField(), message.getInt32ToBytesFieldMap());
    assertEquals(message.getInt32ToEnumField(), message.getInt32ToEnumFieldMap());
    assertEquals(message.getInt32ToEnumFieldValue(), message.getInt32ToEnumFieldValueMap());
    assertEquals(message.getInt32ToMessageField(), message.getInt32ToMessageFieldMap());
  }

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

  private void assertMapContainsSetValues(TestMapOrBuilder testMapOrBuilder) {
    assertTrue(testMapOrBuilder.containsInt32ToInt32Field(1));
    assertTrue(testMapOrBuilder.containsInt32ToInt32Field(2));
    assertTrue(testMapOrBuilder.containsInt32ToInt32Field(3));
    assertFalse(testMapOrBuilder.containsInt32ToInt32Field(-1));

    assertTrue(testMapOrBuilder.containsInt32ToStringField(1));
    assertTrue(testMapOrBuilder.containsInt32ToStringField(2));
    assertTrue(testMapOrBuilder.containsInt32ToStringField(3));
    assertFalse(testMapOrBuilder.containsInt32ToStringField(-1));

    assertTrue(testMapOrBuilder.containsInt32ToBytesField(1));
    assertTrue(testMapOrBuilder.containsInt32ToBytesField(2));
    assertTrue(testMapOrBuilder.containsInt32ToBytesField(3));
    assertFalse(testMapOrBuilder.containsInt32ToBytesField(-1));

    assertTrue(testMapOrBuilder.containsInt32ToEnumField(1));
    assertTrue(testMapOrBuilder.containsInt32ToEnumField(2));
    assertTrue(testMapOrBuilder.containsInt32ToEnumField(3));
    assertFalse(testMapOrBuilder.containsInt32ToEnumField(-1));

    assertTrue(testMapOrBuilder.containsInt32ToMessageField(1));
    assertTrue(testMapOrBuilder.containsInt32ToMessageField(2));
    assertTrue(testMapOrBuilder.containsInt32ToMessageField(3));
    assertFalse(testMapOrBuilder.containsInt32ToMessageField(-1));

    assertTrue(testMapOrBuilder.containsStringToInt32Field("1"));
    assertTrue(testMapOrBuilder.containsStringToInt32Field("2"));
    assertTrue(testMapOrBuilder.containsStringToInt32Field("3"));
    assertFalse(testMapOrBuilder.containsStringToInt32Field("-1"));
  }

  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);
    assertEquals(4, builder.getInt32ToInt32FieldCount());
    assertEquals(4, builder.build().getInt32ToInt32FieldCount());

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

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

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

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

    assertEquals("11", testMapOrBuilder.getInt32ToStringFieldOrDefault(1, "-11"));
    assertNull("-11", testMapOrBuilder.getInt32ToStringFieldOrDefault(-1, null));

    assertEquals(TestUtil.toBytes("11"), testMapOrBuilder.getInt32ToBytesFieldOrDefault(1, null));
    assertNull(testMapOrBuilder.getInt32ToBytesFieldOrDefault(-1, null));

    assertEquals(TestMap.EnumValue.FOO, testMapOrBuilder.getInt32ToEnumFieldOrDefault(1, null));
    assertNull(testMapOrBuilder.getInt32ToEnumFieldOrDefault(-1, null));

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

    assertEquals(
        MessageValue.newBuilder().setValue(11).build(),
        testMapOrBuilder.getInt32ToMessageFieldOrDefault(1, null));
    assertNull(testMapOrBuilder.getInt32ToMessageFieldOrDefault(-1, null));

    assertEquals(11, testMapOrBuilder.getStringToInt32FieldOrDefault("1", -11));
    assertEquals(-11, testMapOrBuilder.getStringToInt32FieldOrDefault("-1", -11));

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

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

  public void doTestGetOrThrow(TestMapOrBuilder testMapOrBuilder) {
    assertEquals(11, testMapOrBuilder.getInt32ToInt32FieldOrThrow(1));
    try {
      testMapOrBuilder.getInt32ToInt32FieldOrThrow(-1);
      fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertEquals("11", testMapOrBuilder.getInt32ToStringFieldOrThrow(1));

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

    assertEquals(TestUtil.toBytes("11"), testMapOrBuilder.getInt32ToBytesFieldOrThrow(1));

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

    assertEquals(TestMap.EnumValue.FOO, testMapOrBuilder.getInt32ToEnumFieldOrThrow(1));
    try {
      testMapOrBuilder.getInt32ToEnumFieldOrThrow(-1);
      fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertEquals(
        TestMap.EnumValue.BAR.getNumber(), testMapOrBuilder.getInt32ToEnumFieldValueOrThrow(2));
    try {
      testMapOrBuilder.getInt32ToEnumFieldValueOrThrow(-1);
      fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertEquals(
        MessageValue.newBuilder().setValue(11).build(),
        testMapOrBuilder.getInt32ToMessageFieldOrThrow(1));
    try {
      testMapOrBuilder.getInt32ToMessageFieldOrThrow(-1);
      fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

    assertEquals(11, testMapOrBuilder.getStringToInt32FieldOrThrow("1"));
    try {
      testMapOrBuilder.getStringToInt32FieldOrThrow("-1");
      fail();
    } catch (IllegalArgumentException e) {
      // expected
    }

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

  public void testPut() {
    TestMap.Builder builder = TestMap.newBuilder();
    builder.putInt32ToInt32Field(1, 11);
    assertEquals(11, builder.getInt32ToInt32FieldOrThrow(1));

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

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

    builder.putInt32ToEnumField(1, TestMap.EnumValue.FOO);
    assertEquals(TestMap.EnumValue.FOO, builder.getInt32ToEnumFieldOrThrow(1));
    try {
      builder.putInt32ToEnumField(1, null);
      fail();
    } catch (NullPointerException e) {
      // expected
    }

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

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

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

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

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

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

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

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

  public void testReservedWordsFieldNames() {
    ReservedAsMapField.newBuilder().build();
    ReservedAsMapFieldWithEnumValue.newBuilder().build();
  }

  public void testDeterministicSerialziation() 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:
          fail("Unexpected fields.");
      }
      input.popLimit(oldLimit);
    }
    assertEquals(Arrays.asList(-2, 0, 1, 4, 5), int32Keys);
    assertEquals(Arrays.asList(-2, 0, 1, 4, 5), uint32Keys);
    assertEquals(Arrays.asList(-2L, 0L, 1L, 4L, 5L), int64Keys);
    assertEquals(Arrays.asList("", "bar", "baz", "foo", "hello", "world"), stringKeys);
  }

  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();
    assertEquals(
        TestMap.MessageValue.newBuilder().setValue(10).build(),
        message.getInt32ToMessageFieldMap().get(10));
  }

  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();
    assertEquals(
        TestMap.MessageValue.newBuilder().setValue(10).build(),
        message.getInt32ToMessageFieldMap().get(10));
  }

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

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

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

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

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

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

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

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

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

    assertArrayEquals(new byte[0], builder.build().toByteArray());
  }
}
