com.google.protobuf.MapEntry Maven / Gradle / Ivy
Show all versions of protobuf-java Show documentation
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
package com.google.protobuf;
import com.google.protobuf.Descriptors.Descriptor;
import com.google.protobuf.Descriptors.EnumValueDescriptor;
import com.google.protobuf.Descriptors.FieldDescriptor;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import java.util.TreeMap;
/**
* Implements MapEntry messages.
*
* In reflection API, map fields will be treated as repeated message fields and each map entry is
* accessed as a message. This MapEntry class is used to represent these map entry messages in
* reflection API.
*
*
Protobuf internal. Users shouldn't use this class.
*/
public final class MapEntry extends AbstractMessage {
private static final class Metadata extends MapEntryLite.Metadata {
public final Descriptor descriptor;
public final Parser> parser;
public Metadata(
Descriptor descriptor,
MapEntry defaultInstance,
WireFormat.FieldType keyType,
WireFormat.FieldType valueType) {
super(keyType, defaultInstance.key, valueType, defaultInstance.value);
this.descriptor = descriptor;
this.parser =
new AbstractParser>() {
@Override
public MapEntry parsePartialFrom(
CodedInputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
return new MapEntry(Metadata.this, input, extensionRegistry);
}
};
}
}
private final K key;
private final V value;
private final Metadata metadata;
/** Create a default MapEntry instance. */
private MapEntry(
Descriptor descriptor,
WireFormat.FieldType keyType,
K defaultKey,
WireFormat.FieldType valueType,
V defaultValue) {
this.key = defaultKey;
this.value = defaultValue;
this.metadata = new Metadata(descriptor, this, keyType, valueType);
}
/** Create a MapEntry with the provided key and value. */
@SuppressWarnings("unchecked")
private MapEntry(Metadata metadata, K key, V value) {
this.key = key;
this.value = value;
this.metadata = metadata;
}
/** Parsing constructor. */
private MapEntry(
Metadata metadata, CodedInputStream input, ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
try {
this.metadata = metadata;
Map.Entry entry = MapEntryLite.parseEntry(input, metadata, extensionRegistry);
this.key = entry.getKey();
this.value = entry.getValue();
} catch (InvalidProtocolBufferException e) {
throw e.setUnfinishedMessage(this);
} catch (IOException e) {
throw new InvalidProtocolBufferException(e).setUnfinishedMessage(this);
}
}
/**
* Create a default MapEntry instance. A default MapEntry instance should be created only once for
* each map entry message type. Generated code should store the created default instance and use
* it later to create new MapEntry messages of the same type.
*/
public static MapEntry newDefaultInstance(
Descriptor descriptor,
WireFormat.FieldType keyType,
K defaultKey,
WireFormat.FieldType valueType,
V defaultValue) {
return new MapEntry(descriptor, keyType, defaultKey, valueType, defaultValue);
}
public K getKey() {
return key;
}
public V getValue() {
return value;
}
private volatile int cachedSerializedSize = -1;
@Override
public int getSerializedSize() {
if (cachedSerializedSize != -1) {
return cachedSerializedSize;
}
int size = MapEntryLite.computeSerializedSize(metadata, key, value);
cachedSerializedSize = size;
return size;
}
@Override
public void writeTo(CodedOutputStream output) throws IOException {
MapEntryLite.writeTo(output, metadata, key, value);
}
@Override
public boolean isInitialized() {
return isInitialized(metadata, value);
}
@Override
public Parser> getParserForType() {
return metadata.parser;
}
@Override
public Builder newBuilderForType() {
return new Builder(metadata);
}
@Override
public Builder toBuilder() {
return new Builder(metadata, key, value, true, true);
}
@Override
public MapEntry getDefaultInstanceForType() {
return new MapEntry(metadata, metadata.defaultKey, metadata.defaultValue);
}
@Override
public Descriptor getDescriptorForType() {
return metadata.descriptor;
}
@Override
public Map getAllFields() {
TreeMap result = new TreeMap();
for (final FieldDescriptor field : metadata.descriptor.getFields()) {
if (hasField(field)) {
result.put(field, getField(field));
}
}
return Collections.unmodifiableMap(result);
}
private void checkFieldDescriptor(FieldDescriptor field) {
if (field.getContainingType() != metadata.descriptor) {
throw new RuntimeException(
"Wrong FieldDescriptor \""
+ field.getFullName()
+ "\" used in message \""
+ metadata.descriptor.getFullName());
}
}
@Override
public boolean hasField(FieldDescriptor field) {
checkFieldDescriptor(field);
;
// A MapEntry always contains two fields.
return true;
}
@Override
public Object getField(FieldDescriptor field) {
checkFieldDescriptor(field);
Object result = field.getNumber() == 1 ? getKey() : getValue();
// Convert enums to EnumValueDescriptor.
if (field.getType() == FieldDescriptor.Type.ENUM) {
result = field.getEnumType().findValueByNumberCreatingIfUnknown((java.lang.Integer) result);
}
return result;
}
@Override
public int getRepeatedFieldCount(FieldDescriptor field) {
throw new RuntimeException("There is no repeated field in a map entry message.");
}
@Override
public Object getRepeatedField(FieldDescriptor field, int index) {
throw new RuntimeException("There is no repeated field in a map entry message.");
}
@Override
public UnknownFieldSet getUnknownFields() {
return UnknownFieldSet.getDefaultInstance();
}
/** Builder to create {@link MapEntry} messages. */
public static class Builder extends AbstractMessage.Builder> {
private final Metadata metadata;
private K key;
private V value;
private boolean hasKey;
private boolean hasValue;
private Builder(Metadata metadata) {
this(metadata, metadata.defaultKey, metadata.defaultValue, false, false);
}
private Builder(Metadata metadata, K key, V value, boolean hasKey, boolean hasValue) {
this.metadata = metadata;
this.key = key;
this.value = value;
this.hasKey = hasKey;
this.hasValue = hasValue;
}
public K getKey() {
return key;
}
public V getValue() {
return value;
}
public Builder setKey(K key) {
this.key = key;
this.hasKey = true;
return this;
}
public Builder clearKey() {
this.key = metadata.defaultKey;
this.hasKey = false;
return this;
}
public Builder setValue(V value) {
this.value = value;
this.hasValue = true;
return this;
}
public Builder clearValue() {
this.value = metadata.defaultValue;
this.hasValue = false;
return this;
}
@Override
public MapEntry build() {
MapEntry result = buildPartial();
if (!result.isInitialized()) {
throw newUninitializedMessageException(result);
}
return result;
}
@Override
public MapEntry buildPartial() {
return new MapEntry(metadata, key, value);
}
@Override
public Descriptor getDescriptorForType() {
return metadata.descriptor;
}
private void checkFieldDescriptor(FieldDescriptor field) {
if (field.getContainingType() != metadata.descriptor) {
throw new RuntimeException(
"Wrong FieldDescriptor \""
+ field.getFullName()
+ "\" used in message \""
+ metadata.descriptor.getFullName());
}
}
@Override
public Message.Builder newBuilderForField(FieldDescriptor field) {
checkFieldDescriptor(field);
;
// This method should be called for message fields and in a MapEntry
// message only the value field can possibly be a message field.
if (field.getNumber() != 2 || field.getJavaType() != FieldDescriptor.JavaType.MESSAGE) {
throw new RuntimeException("\"" + field.getFullName() + "\" is not a message value field.");
}
return ((Message) value).newBuilderForType();
}
@SuppressWarnings("unchecked")
@Override
public Builder setField(FieldDescriptor field, Object value) {
checkFieldDescriptor(field);
if (value == null) {
throw new NullPointerException(field.getFullName() + " is null");
}
if (field.getNumber() == 1) {
setKey((K) value);
} else {
if (field.getType() == FieldDescriptor.Type.ENUM) {
value = ((EnumValueDescriptor) value).getNumber();
} else if (field.getType() == FieldDescriptor.Type.MESSAGE) {
if (!metadata.defaultValue.getClass().isInstance(value)) {
// The value is not the exact right message type. However, if it
// is an alternative implementation of the same type -- e.g. a
// DynamicMessage -- we should accept it. In this case we can make
// a copy of the message.
value =
((Message) metadata.defaultValue).toBuilder().mergeFrom((Message) value).build();
}
}
setValue((V) value);
}
return this;
}
@Override
public Builder clearField(FieldDescriptor field) {
checkFieldDescriptor(field);
if (field.getNumber() == 1) {
clearKey();
} else {
clearValue();
}
return this;
}
@Override
public Builder setRepeatedField(FieldDescriptor field, int index, Object value) {
throw new RuntimeException("There is no repeated field in a map entry message.");
}
@Override
public Builder addRepeatedField(FieldDescriptor field, Object value) {
throw new RuntimeException("There is no repeated field in a map entry message.");
}
@Override
public Builder setUnknownFields(UnknownFieldSet unknownFields) {
// Unknown fields are discarded for MapEntry message.
return this;
}
@Override
public MapEntry getDefaultInstanceForType() {
return new MapEntry(metadata, metadata.defaultKey, metadata.defaultValue);
}
@Override
public boolean isInitialized() {
return MapEntry.isInitialized(metadata, value);
}
@Override
public Map getAllFields() {
final TreeMap result = new TreeMap();
for (final FieldDescriptor field : metadata.descriptor.getFields()) {
if (hasField(field)) {
result.put(field, getField(field));
}
}
return Collections.unmodifiableMap(result);
}
@Override
public boolean hasField(FieldDescriptor field) {
checkFieldDescriptor(field);
return field.getNumber() == 1 ? hasKey : hasValue;
}
@Override
public Object getField(FieldDescriptor field) {
checkFieldDescriptor(field);
Object result = field.getNumber() == 1 ? getKey() : getValue();
// Convert enums to EnumValueDescriptor.
if (field.getType() == FieldDescriptor.Type.ENUM) {
result = field.getEnumType().findValueByNumberCreatingIfUnknown((Integer) result);
}
return result;
}
@Override
public int getRepeatedFieldCount(FieldDescriptor field) {
throw new RuntimeException("There is no repeated field in a map entry message.");
}
@Override
public Object getRepeatedField(FieldDescriptor field, int index) {
throw new RuntimeException("There is no repeated field in a map entry message.");
}
@Override
public UnknownFieldSet getUnknownFields() {
return UnknownFieldSet.getDefaultInstance();
}
@Override
public Builder clone() {
return new Builder<>(metadata, key, value, hasKey, hasValue);
}
}
private static boolean isInitialized(Metadata metadata, V value) {
if (metadata.valueType.getJavaType() == WireFormat.JavaType.MESSAGE) {
return ((MessageLite) value).isInitialized();
}
return true;
}
/** Returns the metadata only for experimental runtime. */
final Metadata getMetadata() {
return metadata;
}
}