// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
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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 com.google.protobuf.Descriptors.Descriptor;
import com.google.protobuf.Descriptors.EnumValueDescriptor;
import com.google.protobuf.Descriptors.FieldDescriptor;
import com.google.protobuf.Descriptors.OneofDescriptor;
import java.io.InputStream;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
/**
* An implementation of {@link Message} that can represent arbitrary types,
* given a {@link Descriptors.Descriptor}.
*
* @author kenton@google.com Kenton Varda
*/
public final class DynamicMessage extends AbstractMessage {
private final Descriptor type;
private final FieldSet<FieldDescriptor> fields;
private final FieldDescriptor[] oneofCases;
private final UnknownFieldSet unknownFields;
private int memoizedSize = -1;
/**
* Construct a {@code DynamicMessage} using the given {@code FieldSet}.
* oneofCases stores the FieldDescriptor for each oneof to indicate
* which field is set. Caller should make sure the array is immutable.
*
* This contructor is package private and will be used in
* {@code DynamicMutableMessage} to convert a mutable message to an immutable
* message.
*/
DynamicMessage(Descriptor type, FieldSet<FieldDescriptor> fields,
FieldDescriptor[] oneofCases,
UnknownFieldSet unknownFields) {
this.type = type;
this.fields = fields;
this.oneofCases = oneofCases;
this.unknownFields = unknownFields;
}
/**
* Get a {@code DynamicMessage} representing the default instance of the
* given type.
*/
public static DynamicMessage getDefaultInstance(Descriptor type) {
int oneofDeclCount = type.toProto().getOneofDeclCount();
FieldDescriptor[] oneofCases = new FieldDescriptor[oneofDeclCount];
return new DynamicMessage(type, FieldSet.<FieldDescriptor>emptySet(),
oneofCases,
UnknownFieldSet.getDefaultInstance());
}
/** Parse a message of the given type from the given input stream. */
public static DynamicMessage parseFrom(Descriptor type,
CodedInputStream input)
throws IOException {
return newBuilder(type).mergeFrom(input).buildParsed();
}
/** Parse a message of the given type from the given input stream. */
public static DynamicMessage parseFrom(
Descriptor type,
CodedInputStream input,
ExtensionRegistry extensionRegistry)
throws IOException {
return newBuilder(type).mergeFrom(input, extensionRegistry).buildParsed();
}
/** Parse {@code data} as a message of the given type and return it. */
public static DynamicMessage parseFrom(Descriptor type, ByteString data)
throws InvalidProtocolBufferException {
return newBuilder(type).mergeFrom(data).buildParsed();
}
/** Parse {@code data} as a message of the given type and return it. */
public static DynamicMessage parseFrom(Descriptor type, ByteString data,
ExtensionRegistry extensionRegistry)
throws InvalidProtocolBufferException {
return newBuilder(type).mergeFrom(data, extensionRegistry).buildParsed();
}
/** Parse {@code data} as a message of the given type and return it. */
public static DynamicMessage parseFrom(Descriptor type, byte[] data)
throws InvalidProtocolBufferException {
return newBuilder(type).mergeFrom(data).buildParsed();
}
/** Parse {@code data} as a message of the given type and return it. */
public static DynamicMessage parseFrom(Descriptor type, byte[] data,
ExtensionRegistry extensionRegistry)
throws InvalidProtocolBufferException {
return newBuilder(type).mergeFrom(data, extensionRegistry).buildParsed();
}
/** Parse a message of the given type from {@code input} and return it. */
public static DynamicMessage parseFrom(Descriptor type, InputStream input)
throws IOException {
return newBuilder(type).mergeFrom(input).buildParsed();
}
/** Parse a message of the given type from {@code input} and return it. */
public static DynamicMessage parseFrom(Descriptor type, InputStream input,
ExtensionRegistry extensionRegistry)
throws IOException {
return newBuilder(type).mergeFrom(input, extensionRegistry).buildParsed();
}
/** Construct a {@link Message.Builder} for the given type. */
public static Builder newBuilder(Descriptor type) {
return new Builder(type);
}
/**
* Construct a {@link Message.Builder} for a message of the same type as
* {@code prototype}, and initialize it with {@code prototype}'s contents.
*/
public static Builder newBuilder(Message prototype) {
return new Builder(prototype.getDescriptorForType()).mergeFrom(prototype);
}
// -----------------------------------------------------------------
// Implementation of Message interface.
public Descriptor getDescriptorForType() {
return type;
}
public DynamicMessage getDefaultInstanceForType() {
return getDefaultInstance(type);
}
public Map<FieldDescriptor, Object> getAllFields() {
return fields.getAllFields();
}
public boolean hasOneof(OneofDescriptor oneof) {
verifyOneofContainingType(oneof);
FieldDescriptor field = oneofCases[oneof.getIndex()];
if (field == null) {
return false;
}
return true;
}
public FieldDescriptor getOneofFieldDescriptor(OneofDescriptor oneof) {
verifyOneofContainingType(oneof);
return oneofCases[oneof.getIndex()];
}
public boolean hasField(FieldDescriptor field) {
verifyContainingType(field);
return fields.hasField(field);
}
public Object getField(FieldDescriptor field) {
verifyContainingType(field);
Object result = fields.getField(field);
if (result == null) {
if (field.isRepeated()) {
result = Collections.emptyList();
} else if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) {
result = getDefaultInstance(field.getMessageType());
} else {
result = field.getDefaultValue();
}
}
return result;
}
public int getRepeatedFieldCount(FieldDescriptor field) {
verifyContainingType(field);
return fields.getRepeatedFieldCount(field);
}
public Object getRepeatedField(FieldDescriptor field, int index) {
verifyContainingType(field);
return fields.getRepeatedField(field, index);
}
public UnknownFieldSet getUnknownFields() {
return unknownFields;
}
static boolean isInitialized(Descriptor type,
FieldSet<FieldDescriptor> fields) {
// Check that all required fields are present.
for (final FieldDescriptor field : type.getFields()) {
if (field.isRequired()) {
if (!fields.hasField(field)) {
return false;
}
}
}
// Check that embedded messages are initialized.
return fields.isInitialized();
}
@Override
public boolean isInitialized() {
return isInitialized(type, fields);
}
@Override
public void writeTo(CodedOutputStream output) throws IOException {
if (type.getOptions().getMessageSetWireFormat()) {
fields.writeMessageSetTo(output);
unknownFields.writeAsMessageSetTo(output);
} else {
fields.writeTo(output);
unknownFields.writeTo(output);
}
}
@Override
public int getSerializedSize() {
int size = memoizedSize;
if (size != -1) return size;
if (type.getOptions().getMessageSetWireFormat()) {
size = fields.getMessageSetSerializedSize();
size += unknownFields.getSerializedSizeAsMessageSet();
} else {
size = fields.getSerializedSize();
size += unknownFields.getSerializedSize();
}
memoizedSize = size;
return size;
}
public Builder newBuilderForType() {
return new Builder(type);
}
public Builder toBuilder() {
return newBuilderForType().mergeFrom(this);
}
public Parser<DynamicMessage> getParserForType() {
return new AbstractParser<DynamicMessage>() {
public DynamicMessage parsePartialFrom(
CodedInputStream input,
ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
Builder builder = newBuilder(type);
try {
builder.mergeFrom(input, extensionRegistry);
} catch (InvalidProtocolBufferException e) {
throw e.setUnfinishedMessage(builder.buildPartial());
} catch (IOException e) {
throw new InvalidProtocolBufferException(e.getMessage())
.setUnfinishedMessage(builder.buildPartial());
}
return builder.buildPartial();
}
};
}
/** Verifies that the field is a field of this message. */
private void verifyContainingType(FieldDescriptor field) {
if (field.getContainingType() != type) {
throw new IllegalArgumentException(
"FieldDescriptor does not match message type.");
}
}
/** Verifies that the oneof is an oneof of this message. */
private void verifyOneofContainingType(OneofDescriptor oneof) {
if (oneof.getContainingType() != type) {
throw new IllegalArgumentException(
"OneofDescriptor does not match message type.");
}
}
// =================================================================
/**
* Builder for {@link DynamicMessage}s.
*/
public static final class Builder extends AbstractMessage.Builder<Builder> {
private final Descriptor type;
private FieldSet<FieldDescriptor> fields;
private final FieldDescriptor[] oneofCases;
private UnknownFieldSet unknownFields;
/** Construct a {@code Builder} for the given type. */
private Builder(Descriptor type) {
this.type = type;
this.fields = FieldSet.newFieldSet();
this.unknownFields = UnknownFieldSet.getDefaultInstance();
this.oneofCases = new FieldDescriptor[type.toProto().getOneofDeclCount()];
}
// ---------------------------------------------------------------
// Implementation of Message.Builder interface.
@Override
public Builder clear() {
if (fields.isImmutable()) {
fields = FieldSet.newFieldSet();
} else {
fields.clear();
}
unknownFields = UnknownFieldSet.getDefaultInstance();
return this;
}
@Override
public Builder mergeFrom(Message other) {
if (other instanceof DynamicMessage) {
// This should be somewhat faster than calling super.mergeFrom().
DynamicMessage otherDynamicMessage = (DynamicMessage) other;
if (otherDynamicMessage.type != type) {
throw new IllegalArgumentException(
"mergeFrom(Message) can only merge messages of the same type.");
}
ensureIsMutable();
fields.mergeFrom(otherDynamicMessage.fields);
mergeUnknownFields(otherDynamicMessage.unknownFields);
for (int i = 0; i < oneofCases.length; i++) {
if (oneofCases[i] == null) {
oneofCases[i] = otherDynamicMessage.oneofCases[i];
} else {
if ((otherDynamicMessage.oneofCases[i] != null)
&& (oneofCases[i] != otherDynamicMessage.oneofCases[i])) {
fields.clearField(oneofCases[i]);
oneofCases[i] = otherDynamicMessage.oneofCases[i];
}
}
}
return this;
} else {
return super.mergeFrom(other);
}
}
public DynamicMessage build() {
if (!isInitialized()) {
throw newUninitializedMessageException(
new DynamicMessage(type, fields,
java.util.Arrays.copyOf(oneofCases, oneofCases.length), unknownFields));
}
return buildPartial();
}
/**
* Helper for DynamicMessage.parseFrom() methods to call. Throws
* {@link InvalidProtocolBufferException} instead of
* {@link UninitializedMessageException}.
*/
private DynamicMessage buildParsed() throws InvalidProtocolBufferException {
if (!isInitialized()) {
throw newUninitializedMessageException(
new DynamicMessage(type, fields,
java.util.Arrays.copyOf(oneofCases, oneofCases.length), unknownFields))
.asInvalidProtocolBufferException();
}
return buildPartial();
}
public DynamicMessage buildPartial() {
fields.makeImmutable();
DynamicMessage result =
new DynamicMessage(type, fields,
java.util.Arrays.copyOf(oneofCases, oneofCases.length), unknownFields);
return result;
}
@Override
public Builder clone() {
Builder result = new Builder(type);
result.fields.mergeFrom(fields);
result.mergeUnknownFields(unknownFields);
System.arraycopy(oneofCases, 0, result.oneofCases, 0 , oneofCases.length);
return result;
}
public boolean isInitialized() {
return DynamicMessage.isInitialized(type, fields);
}
public Descriptor getDescriptorForType() {
return type;
}
public DynamicMessage getDefaultInstanceForType() {
return getDefaultInstance(type);
}
public Map<FieldDescriptor, Object> getAllFields() {
return fields.getAllFields();
}
public Builder newBuilderForField(FieldDescriptor field) {
verifyContainingType(field);
if (field.getJavaType() != FieldDescriptor.JavaType.MESSAGE) {
throw new IllegalArgumentException(
"newBuilderForField is only valid for fields with message type.");
}
return new Builder(field.getMessageType());
}
public boolean hasOneof(OneofDescriptor oneof) {
verifyOneofContainingType(oneof);
FieldDescriptor field = oneofCases[oneof.getIndex()];
if (field == null) {
return false;
}
return true;
}
public FieldDescriptor getOneofFieldDescriptor(OneofDescriptor oneof) {
verifyOneofContainingType(oneof);
return oneofCases[oneof.getIndex()];
}
public Builder clearOneof(OneofDescriptor oneof) {
verifyOneofContainingType(oneof);
FieldDescriptor field = oneofCases[oneof.getIndex()];
if (field != null) {
clearField(field);
}
return this;
}
public boolean hasField(FieldDescriptor field) {
verifyContainingType(field);
return fields.hasField(field);
}
public Object getField(FieldDescriptor field) {
verifyContainingType(field);
Object result = fields.getField(field);
if (result == null) {
if (field.isRepeated()) {
result = Collections.emptyList();
} else if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) {
result = getDefaultInstance(field.getMessageType());
} else {
result = field.getDefaultValue();
}
}
return result;
}
public Builder setField(FieldDescriptor field, Object value) {
verifyContainingType(field);
ensureIsMutable();
if (field.getType() == FieldDescriptor.Type.ENUM) {
verifyEnumType(field, value);
}
OneofDescriptor oneofDescriptor = field.getContainingOneof();
if (oneofDescriptor != null) {
int index = oneofDescriptor.getIndex();
FieldDescriptor oldField = oneofCases[index];
if ((oldField != null) && (oldField != field)) {
fields.clearField(oldField);
}
oneofCases[index] = field;
}
fields.setField(field, value);
return this;
}
public Builder clearField(FieldDescriptor field) {
verifyContainingType(field);
ensureIsMutable();
OneofDescriptor oneofDescriptor = field.getContainingOneof();
if (oneofDescriptor != null) {
int index = oneofDescriptor.getIndex();
if (oneofCases[index] == field) {
oneofCases[index] = null;
}
}
fields.clearField(field);
return this;
}
public int getRepeatedFieldCount(FieldDescriptor field) {
verifyContainingType(field);
return fields.getRepeatedFieldCount(field);
}
public Object getRepeatedField(FieldDescriptor field, int index) {
verifyContainingType(field);
return fields.getRepeatedField(field, index);
}
public Builder setRepeatedField(FieldDescriptor field,
int index, Object value) {
verifyContainingType(field);
ensureIsMutable();
fields.setRepeatedField(field, index, value);
return this;
}
public Builder addRepeatedField(FieldDescriptor field, Object value) {
verifyContainingType(field);
ensureIsMutable();
fields.addRepeatedField(field, value);
return this;
}
public UnknownFieldSet getUnknownFields() {
return unknownFields;
}
public Builder setUnknownFields(UnknownFieldSet unknownFields) {
this.unknownFields = unknownFields;
return this;
}
@Override
public Builder mergeUnknownFields(UnknownFieldSet unknownFields) {
this.unknownFields =
UnknownFieldSet.newBuilder(this.unknownFields)
.mergeFrom(unknownFields)
.build();
return this;
}
/** Verifies that the field is a field of this message. */
private void verifyContainingType(FieldDescriptor field) {
if (field.getContainingType() != type) {
throw new IllegalArgumentException(
"FieldDescriptor does not match message type.");
}
}
/** Verifies that the oneof is an oneof of this message. */
private void verifyOneofContainingType(OneofDescriptor oneof) {
if (oneof.getContainingType() != type) {
throw new IllegalArgumentException(
"OneofDescriptor does not match message type.");
}
}
/** Verifies that the value is EnumValueDescriptor and matchs Enum Type. */
private void verifyEnumType(FieldDescriptor field, Object value) {
if (value == null) {
throw new NullPointerException();
}
if (!(value instanceof EnumValueDescriptor)) {
throw new IllegalArgumentException(
"DynamicMessage should use EnumValueDescriptor to set Enum Value.");
}
if (field.getEnumType() != ((EnumValueDescriptor) value).getType()) {
throw new IllegalArgumentException(
"EnumValueDescriptor doesn't much Enum Field.");
}
}
private void ensureIsMutable() {
if (fields.isImmutable()) {
fields = fields.clone();
}
}
@Override
public com.google.protobuf.Message.Builder getFieldBuilder(FieldDescriptor field) {
// TODO(xiangl): need implementation for dynamic message
throw new UnsupportedOperationException(
"getFieldBuilder() called on a dynamic message type.");
}
}
}