// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package com.google.protobuf;
import com.google.protobuf.Descriptors.FieldDescriptor;
import com.google.protobuf.Descriptors.OneofDescriptor;
import com.google.protobuf.Internal.EnumLite;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
/**
* A partial implementation of the {@link Message} interface which implements
* as many methods of that interface as possible in terms of other methods.
*
* @author kenton@google.com Kenton Varda
*/
public abstract class AbstractMessage extends AbstractMessageLite
implements Message {
public boolean isInitialized() {
return MessageReflection.isInitialized(this);
}
public List<String> findInitializationErrors() {
return MessageReflection.findMissingFields(this);
}
public String getInitializationErrorString() {
return MessageReflection.delimitWithCommas(findInitializationErrors());
}
/** TODO(jieluo): Clear it when all subclasses have implemented this method. */
@Override
public boolean hasOneof(OneofDescriptor oneof) {
throw new UnsupportedOperationException("hasOneof() is not implemented.");
}
/** TODO(jieluo): Clear it when all subclasses have implemented this method. */
@Override
public FieldDescriptor getOneofFieldDescriptor(OneofDescriptor oneof) {
throw new UnsupportedOperationException(
"getOneofFieldDescriptor() is not implemented.");
}
@Override
public final String toString() {
return TextFormat.printToString(this);
}
public void writeTo(final CodedOutputStream output) throws IOException {
MessageReflection.writeMessageTo(this, output, false);
}
private int memoizedSize = -1;
public int getSerializedSize() {
int size = memoizedSize;
if (size != -1) {
return size;
}
memoizedSize = MessageReflection.getSerializedSize(this);
return memoizedSize;
}
@Override
public boolean equals(final Object other) {
if (other == this) {
return true;
}
if (!(other instanceof Message)) {
return false;
}
final Message otherMessage = (Message) other;
if (getDescriptorForType() != otherMessage.getDescriptorForType()) {
return false;
}
return compareFields(getAllFields(), otherMessage.getAllFields()) &&
getUnknownFields().equals(otherMessage.getUnknownFields());
}
@Override
public int hashCode() {
int hash = memoizedHashCode;
if (hash == 0) {
hash = 41;
hash = (19 * hash) + getDescriptorForType().hashCode();
hash = hashFields(hash, getAllFields());
hash = (29 * hash) + getUnknownFields().hashCode();
memoizedHashCode = hash;
}
return hash;
}
private static ByteString toByteString(Object value) {
if (value instanceof byte[]) {
return ByteString.copyFrom((byte[]) value);
} else {
return (ByteString) value;
}
}
/**
* Compares two bytes fields. The parameters must be either a byte array or a
* ByteString object. They can be of different type though.
*/
private static boolean compareBytes(Object a, Object b) {
if (a instanceof byte[] && b instanceof byte[]) {
return Arrays.equals((byte[])a, (byte[])b);
}
return toByteString(a).equals(toByteString(b));
}
/**
* Compares two set of fields.
* This method is used to implement {@link AbstractMessage#equals(Object)}
* and {@link AbstractMutableMessage#equals(Object)}. It takes special care
* of bytes fields because immutable messages and mutable messages use
* different Java type to reprensent a bytes field and this method should be
* able to compare immutable messages, mutable messages and also an immutable
* message to a mutable message.
*/
static boolean compareFields(Map<FieldDescriptor, Object> a,
Map<FieldDescriptor, Object> b) {
if (a.size() != b.size()) {
return false;
}
for (FieldDescriptor descriptor : a.keySet()) {
if (!b.containsKey(descriptor)) {
return false;
}
Object value1 = a.get(descriptor);
Object value2 = b.get(descriptor);
if (descriptor.getType() == FieldDescriptor.Type.BYTES) {
if (descriptor.isRepeated()) {
List list1 = (List) value1;
List list2 = (List) value2;
if (list1.size() != list2.size()) {
return false;
}
for (int i = 0; i < list1.size(); i++) {
if (!compareBytes(list1.get(i), list2.get(i))) {
return false;
}
}
} else {
// Compares a singular bytes field.
if (!compareBytes(value1, value2)) {
return false;
}
}
} else {
// Compare non-bytes fields.
if (!value1.equals(value2)) {
return false;
}
}
}
return true;
}
/** Get a hash code for given fields and values, using the given seed. */
@SuppressWarnings("unchecked")
protected static int hashFields(int hash, Map<FieldDescriptor, Object> map) {
for (Map.Entry<FieldDescriptor, Object> entry : map.entrySet()) {
FieldDescriptor field = entry.getKey();
Object value = entry.getValue();
hash = (37 * hash) + field.getNumber();
if (field.getType() != FieldDescriptor.Type.ENUM){
hash = (53 * hash) + value.hashCode();
} else if (field.isRepeated()) {
List<? extends EnumLite> list = (List<? extends EnumLite>) value;
hash = (53 * hash) + Internal.hashEnumList(list);
} else {
hash = (53 * hash) + Internal.hashEnum((EnumLite) value);
}
}
return hash;
}
/**
* Package private helper method for AbstractParser to create
* UninitializedMessageException with missing field information.
*/
@Override
UninitializedMessageException newUninitializedMessageException() {
return Builder.newUninitializedMessageException(this);
}
// =================================================================
/**
* A partial implementation of the {@link Message.Builder} interface which
* implements as many methods of that interface as possible in terms of
* other methods.
*/
@SuppressWarnings("unchecked")
public static abstract class Builder<BuilderType extends Builder>
extends AbstractMessageLite.Builder<BuilderType>
implements Message.Builder {
// The compiler produces an error if this is not declared explicitly.
@Override
public abstract BuilderType clone();
/** TODO(jieluo): Clear it when all subclasses have implemented this method. */
@Override
public boolean hasOneof(OneofDescriptor oneof) {
throw new UnsupportedOperationException("hasOneof() is not implemented.");
}
/** TODO(jieluo): Clear it when all subclasses have implemented this method. */
@Override
public FieldDescriptor getOneofFieldDescriptor(OneofDescriptor oneof) {
throw new UnsupportedOperationException(
"getOneofFieldDescriptor() is not implemented.");
}
/** TODO(jieluo): Clear it when all subclasses have implemented this method. */
@Override
public BuilderType clearOneof(OneofDescriptor oneof) {
throw new UnsupportedOperationException("clearOneof() is not implemented.");
}
public BuilderType clear() {
for (final Map.Entry<FieldDescriptor, Object> entry :
getAllFields().entrySet()) {
clearField(entry.getKey());
}
return (BuilderType) this;
}
public List<String> findInitializationErrors() {
return MessageReflection.findMissingFields(this);
}
public String getInitializationErrorString() {
return MessageReflection.delimitWithCommas(findInitializationErrors());
}
public BuilderType mergeFrom(final Message other) {
if (other.getDescriptorForType() != getDescriptorForType()) {
throw new IllegalArgumentException(
"mergeFrom(Message) can only merge messages of the same type.");
}
// Note: We don't attempt to verify that other's fields have valid
// types. Doing so would be a losing battle. We'd have to verify
// all sub-messages as well, and we'd have to make copies of all of
// them to insure that they don't change after verification (since
// the Message interface itself cannot enforce immutability of
// implementations).
// TODO(kenton): Provide a function somewhere called makeDeepCopy()
// which allows people to make secure deep copies of messages.
for (final Map.Entry<FieldDescriptor, Object> entry :
other.getAllFields().entrySet()) {
final FieldDescriptor field = entry.getKey();
if (field.isRepeated()) {
for (final Object element : (List)entry.getValue()) {
addRepeatedField(field, element);
}
} else if (field.getJavaType() == FieldDescriptor.JavaType.MESSAGE) {
final Message existingValue = (Message)getField(field);
if (existingValue == existingValue.getDefaultInstanceForType()) {
setField(field, entry.getValue());
} else {
setField(field,
existingValue.newBuilderForType()
.mergeFrom(existingValue)
.mergeFrom((Message)entry.getValue())
.build());
}
} else {
setField(field, entry.getValue());
}
}
mergeUnknownFields(other.getUnknownFields());
return (BuilderType) this;
}
@Override
public BuilderType mergeFrom(final CodedInputStream input)
throws IOException {
return mergeFrom(input, ExtensionRegistry.getEmptyRegistry());
}
@Override
public BuilderType mergeFrom(
final CodedInputStream input,
final ExtensionRegistryLite extensionRegistry)
throws IOException {
final UnknownFieldSet.Builder unknownFields =
UnknownFieldSet.newBuilder(getUnknownFields());
while (true) {
final int tag = input.readTag();
if (tag == 0) {
break;
}
MessageReflection.BuilderAdapter builderAdapter =
new MessageReflection.BuilderAdapter(this);
if (!MessageReflection.mergeFieldFrom(input, unknownFields,
extensionRegistry,
getDescriptorForType(),
builderAdapter,
tag)) {
// end group tag
break;
}
}
setUnknownFields(unknownFields.build());
return (BuilderType) this;
}
public BuilderType mergeUnknownFields(final UnknownFieldSet unknownFields) {
setUnknownFields(
UnknownFieldSet.newBuilder(getUnknownFields())
.mergeFrom(unknownFields)
.build());
return (BuilderType) this;
}
public Message.Builder getFieldBuilder(final FieldDescriptor field) {
throw new UnsupportedOperationException(
"getFieldBuilder() called on an unsupported message type.");
}
public String toString() {
return TextFormat.printToString(this);
}
/**
* Construct an UninitializedMessageException reporting missing fields in
* the given message.
*/
protected static UninitializedMessageException
newUninitializedMessageException(Message message) {
return new UninitializedMessageException(
MessageReflection.findMissingFields(message));
}
// ===============================================================
// The following definitions seem to be required in order to make javac
// not produce weird errors like:
//
// java/com/google/protobuf/DynamicMessage.java:203: types
// com.google.protobuf.AbstractMessage.Builder<
// com.google.protobuf.DynamicMessage.Builder> and
// com.google.protobuf.AbstractMessage.Builder<
// com.google.protobuf.DynamicMessage.Builder> are incompatible; both
// define mergeFrom(com.google.protobuf.ByteString), but with unrelated
// return types.
//
// Strangely, these lines are only needed if javac is invoked separately
// on AbstractMessage.java and AbstractMessageLite.java. If javac is
// invoked on both simultaneously, it works. (Or maybe the important
// point is whether or not DynamicMessage.java is compiled together with
// AbstractMessageLite.java -- not sure.) I suspect this is a compiler
// bug.
@Override
public BuilderType mergeFrom(final ByteString data)
throws InvalidProtocolBufferException {
return super.mergeFrom(data);
}
@Override
public BuilderType mergeFrom(
final ByteString data,
final ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
return super.mergeFrom(data, extensionRegistry);
}
@Override
public BuilderType mergeFrom(final byte[] data)
throws InvalidProtocolBufferException {
return super.mergeFrom(data);
}
@Override
public BuilderType mergeFrom(
final byte[] data, final int off, final int len)
throws InvalidProtocolBufferException {
return super.mergeFrom(data, off, len);
}
@Override
public BuilderType mergeFrom(
final byte[] data,
final ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
return super.mergeFrom(data, extensionRegistry);
}
@Override
public BuilderType mergeFrom(
final byte[] data, final int off, final int len,
final ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
return super.mergeFrom(data, off, len, extensionRegistry);
}
@Override
public BuilderType mergeFrom(final InputStream input)
throws IOException {
return super.mergeFrom(input);
}
@Override
public BuilderType mergeFrom(
final InputStream input,
final ExtensionRegistryLite extensionRegistry)
throws IOException {
return super.mergeFrom(input, extensionRegistry);
}
@Override
public boolean mergeDelimitedFrom(final InputStream input)
throws IOException {
return super.mergeDelimitedFrom(input);
}
@Override
public boolean mergeDelimitedFrom(
final InputStream input,
final ExtensionRegistryLite extensionRegistry)
throws IOException {
return super.mergeDelimitedFrom(input, extensionRegistry);
}
}
}