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A trimmed-down version of the Protocol Buffers library.
The newest version!
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// 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 java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Collection;
/**
* A partial implementation of the {@link MessageLite} interface which
* implements as many methods of that interface as possible in terms of other
* methods.
*
* @author [email protected] Kenton Varda
*/
public abstract class AbstractMessageLite<
MessageType extends AbstractMessageLite,
BuilderType extends AbstractMessageLite.Builder>
implements MessageLite {
protected int memoizedHashCode = 0;
@Override
public ByteString toByteString() {
try {
final ByteString.CodedBuilder out =
ByteString.newCodedBuilder(getSerializedSize());
writeTo(out.getCodedOutput());
return out.build();
} catch (IOException e) {
throw new RuntimeException(getSerializingExceptionMessage("ByteString"), e);
}
}
@Override
public byte[] toByteArray() {
try {
final byte[] result = new byte[getSerializedSize()];
final CodedOutputStream output = CodedOutputStream.newInstance(result);
writeTo(output);
output.checkNoSpaceLeft();
return result;
} catch (IOException e) {
throw new RuntimeException(getSerializingExceptionMessage("byte array"), e);
}
}
@Override
public void writeTo(final OutputStream output) throws IOException {
final int bufferSize =
CodedOutputStream.computePreferredBufferSize(getSerializedSize());
final CodedOutputStream codedOutput =
CodedOutputStream.newInstance(output, bufferSize);
writeTo(codedOutput);
codedOutput.flush();
}
@Override
public void writeDelimitedTo(final OutputStream output) throws IOException {
final int serialized = getSerializedSize();
final int bufferSize = CodedOutputStream.computePreferredBufferSize(
CodedOutputStream.computeRawVarint32Size(serialized) + serialized);
final CodedOutputStream codedOutput =
CodedOutputStream.newInstance(output, bufferSize);
codedOutput.writeRawVarint32(serialized);
writeTo(codedOutput);
codedOutput.flush();
}
/**
* Package private helper method for AbstractParser to create
* UninitializedMessageException.
*/
UninitializedMessageException newUninitializedMessageException() {
return new UninitializedMessageException(this);
}
private String getSerializingExceptionMessage(String target) {
return "Serializing " + getClass().getName() + " to a " + target
+ " threw an IOException (should never happen).";
}
protected static void checkByteStringIsUtf8(ByteString byteString)
throws IllegalArgumentException {
if (!byteString.isValidUtf8()) {
throw new IllegalArgumentException("Byte string is not UTF-8.");
}
}
protected static void addAll(final Iterable values,
final Collection list) {
Builder.addAll(values, list);
}
/**
* 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 abstract static class Builder<
MessageType extends AbstractMessageLite,
BuilderType extends Builder>
implements MessageLite.Builder {
// The compiler produces an error if this is not declared explicitly.
@Override
public abstract BuilderType clone();
@Override
public BuilderType mergeFrom(final CodedInputStream input) throws IOException {
return mergeFrom(input, ExtensionRegistryLite.getEmptyRegistry());
}
// Re-defined here for return type covariance.
@Override
public abstract BuilderType mergeFrom(
final CodedInputStream input, final ExtensionRegistryLite extensionRegistry)
throws IOException;
@Override
public BuilderType mergeFrom(final ByteString data) throws InvalidProtocolBufferException {
try {
final CodedInputStream input = data.newCodedInput();
mergeFrom(input);
input.checkLastTagWas(0);
return (BuilderType) this;
} catch (InvalidProtocolBufferException e) {
throw e;
} catch (IOException e) {
throw new RuntimeException(getReadingExceptionMessage("ByteString"), e);
}
}
@Override
public BuilderType mergeFrom(
final ByteString data, final ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
try {
final CodedInputStream input = data.newCodedInput();
mergeFrom(input, extensionRegistry);
input.checkLastTagWas(0);
return (BuilderType) this;
} catch (InvalidProtocolBufferException e) {
throw e;
} catch (IOException e) {
throw new RuntimeException(getReadingExceptionMessage("ByteString"), e);
}
}
@Override
public BuilderType mergeFrom(final byte[] data) throws InvalidProtocolBufferException {
return mergeFrom(data, 0, data.length);
}
@Override
public BuilderType mergeFrom(final byte[] data, final int off, final int len)
throws InvalidProtocolBufferException {
try {
final CodedInputStream input =
CodedInputStream.newInstance(data, off, len);
mergeFrom(input);
input.checkLastTagWas(0);
return (BuilderType) this;
} catch (InvalidProtocolBufferException e) {
throw e;
} catch (IOException e) {
throw new RuntimeException(getReadingExceptionMessage("byte array"), e);
}
}
@Override
public BuilderType mergeFrom(final byte[] data, final ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
return mergeFrom(data, 0, data.length, extensionRegistry);
}
@Override
public BuilderType mergeFrom(
final byte[] data,
final int off,
final int len,
final ExtensionRegistryLite extensionRegistry)
throws InvalidProtocolBufferException {
try {
final CodedInputStream input =
CodedInputStream.newInstance(data, off, len);
mergeFrom(input, extensionRegistry);
input.checkLastTagWas(0);
return (BuilderType) this;
} catch (InvalidProtocolBufferException e) {
throw e;
} catch (IOException e) {
throw new RuntimeException(getReadingExceptionMessage("byte array"), e);
}
}
@Override
public BuilderType mergeFrom(final InputStream input) throws IOException {
final CodedInputStream codedInput = CodedInputStream.newInstance(input);
mergeFrom(codedInput);
codedInput.checkLastTagWas(0);
return (BuilderType) this;
}
@Override
public BuilderType mergeFrom(
final InputStream input, final ExtensionRegistryLite extensionRegistry) throws IOException {
final CodedInputStream codedInput = CodedInputStream.newInstance(input);
mergeFrom(codedInput, extensionRegistry);
codedInput.checkLastTagWas(0);
return (BuilderType) this;
}
/**
* An InputStream implementations which reads from some other InputStream
* but is limited to a particular number of bytes. Used by
* mergeDelimitedFrom(). This is intentionally package-private so that
* UnknownFieldSet can share it.
*/
static final class LimitedInputStream extends FilterInputStream {
private int limit;
LimitedInputStream(InputStream in, int limit) {
super(in);
this.limit = limit;
}
@Override
public int available() throws IOException {
return Math.min(super.available(), limit);
}
@Override
public int read() throws IOException {
if (limit <= 0) {
return -1;
}
final int result = super.read();
if (result >= 0) {
--limit;
}
return result;
}
@Override
public int read(final byte[] b, final int off, int len)
throws IOException {
if (limit <= 0) {
return -1;
}
len = Math.min(len, limit);
final int result = super.read(b, off, len);
if (result >= 0) {
limit -= result;
}
return result;
}
@Override
public long skip(final long n) throws IOException {
final long result = super.skip(Math.min(n, limit));
if (result >= 0) {
limit -= result;
}
return result;
}
}
@Override
public boolean mergeDelimitedFrom(
final InputStream input, final ExtensionRegistryLite extensionRegistry) throws IOException {
final int firstByte = input.read();
if (firstByte == -1) {
return false;
}
final int size = CodedInputStream.readRawVarint32(firstByte, input);
final InputStream limitedInput = new LimitedInputStream(input, size);
mergeFrom(limitedInput, extensionRegistry);
return true;
}
@Override
public boolean mergeDelimitedFrom(final InputStream input) throws IOException {
return mergeDelimitedFrom(input,
ExtensionRegistryLite.getEmptyRegistry());
}
@Override
@SuppressWarnings("unchecked") // isInstance takes care of this
public BuilderType mergeFrom(final MessageLite other) {
if (!getDefaultInstanceForType().getClass().isInstance(other)) {
throw new IllegalArgumentException(
"mergeFrom(MessageLite) can only merge messages of the same type.");
}
return internalMergeFrom((MessageType) other);
}
protected abstract BuilderType internalMergeFrom(MessageType message);
private String getReadingExceptionMessage(String target) {
return "Reading " + getClass().getName() + " from a " + target
+ " threw an IOException (should never happen).";
}
/**
* Construct an UninitializedMessageException reporting missing fields in
* the given message.
*/
protected static UninitializedMessageException
newUninitializedMessageException(MessageLite message) {
return new UninitializedMessageException(message);
}
/**
* Adds the {@code values} to the {@code list}. This is a helper method
* used by generated code. Users should ignore it.
*
* @throws NullPointerException if {@code values} or any of the elements of
* {@code values} is null. When that happens, some elements of
* {@code values} may have already been added to the result {@code list}.
*/
protected static void addAll(final Iterable values,
final Collection list) {
if (values == null) {
throw new NullPointerException();
}
if (values instanceof LazyStringList) {
// For StringOrByteStringLists, check the underlying elements to avoid
// forcing conversions of ByteStrings to Strings.
checkForNullValues(((LazyStringList) values).getUnderlyingElements());
list.addAll((Collection) values);
} else if (values instanceof Collection) {
checkForNullValues(values);
list.addAll((Collection) values);
} else {
for (final T value : values) {
if (value == null) {
throw new NullPointerException();
}
list.add(value);
}
}
}
private static void checkForNullValues(final Iterable values) {
for (final Object value : values) {
if (value == null) {
throw new NullPointerException();
}
}
}
}
}