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// Protocol Buffers - Google's data interchange format
// Copyright 2013 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.nano;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Base class of those Protocol Buffer messages that need to store unknown fields,
* such as extensions.
*/
public abstract class ExtendableMessageNano<M extends ExtendableMessageNano<M>>
extends MessageNano {
/**
* A container for fields unknown to the message, including extensions. Extension fields can
* can be accessed through the {@link #getExtension} and {@link #setExtension} methods.
*/
protected List<UnknownFieldData> unknownFieldData;
@Override
protected int computeSerializedSize() {
int size = 0;
int unknownFieldCount = unknownFieldData == null ? 0 : unknownFieldData.size();
for (int i = 0; i < unknownFieldCount; i++) {
UnknownFieldData unknownField = unknownFieldData.get(i);
size += CodedOutputByteBufferNano.computeRawVarint32Size(unknownField.tag);
size += unknownField.bytes.length;
}
return size;
}
@Override
public void writeTo(CodedOutputByteBufferNano output) throws IOException {
int unknownFieldCount = unknownFieldData == null ? 0 : unknownFieldData.size();
for (int i = 0; i < unknownFieldCount; i++) {
UnknownFieldData unknownField = unknownFieldData.get(i);
output.writeRawVarint32(unknownField.tag);
output.writeRawBytes(unknownField.bytes);
}
}
/**
* Gets the value stored in the specified extension of this message.
*/
public final <T> T getExtension(Extension<M, T> extension) {
return extension.getValueFrom(unknownFieldData);
}
/**
* Sets the value of the specified extension of this message.
*/
public final <T> M setExtension(Extension<M, T> extension, T value) {
unknownFieldData = extension.setValueTo(value, unknownFieldData);
@SuppressWarnings("unchecked") // Generated code should guarantee type safety
M typedThis = (M) this;
return typedThis;
}
/**
* Stores the binary data of an unknown field.
*
* <p>Generated messages will call this for unknown fields if the store_unknown_fields
* option is on.
*
* <p>Note that the tag might be a end-group tag (rather than the start of an unknown field) in
* which case we do not want to add an unknown field entry.
*
* @param input the input buffer.
* @param tag the tag of the field.
* @return {@literal true} unless the tag is an end-group tag.
*/
protected final boolean storeUnknownField(CodedInputByteBufferNano input, int tag)
throws IOException {
int startPos = input.getPosition();
if (!input.skipField(tag)) {
return false; // This wasn't an unknown field, it's an end-group tag.
}
if (unknownFieldData == null) {
unknownFieldData = new ArrayList<UnknownFieldData>();
}
int endPos = input.getPosition();
byte[] bytes = input.getData(startPos, endPos - startPos);
unknownFieldData.add(new UnknownFieldData(tag, bytes));
return true;
}
}
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