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Core Protocol Buffers library. Protocol Buffers are a way of encoding structured data in an
efficient yet extensible format.
// 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 static com.google.protobuf.Internal.checkNotNull;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* 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.computeUInt32SizeNoTag(serialized) + serialized);
final CodedOutputStream codedOutput = CodedOutputStream.newInstance(output, bufferSize);
codedOutput.writeUInt32NoTag(serialized);
writeTo(codedOutput);
codedOutput.flush();
}
// We'd like these to be abstract but some folks are extending this class directly. They shouldn't
// be doing that and they should feel bad.
int getMemoizedSerializedSize() {
throw new UnsupportedOperationException();
}
void setMemoizedSerializedSize(int size) {
throw new UnsupportedOperationException();
}
int getSerializedSize(
Schema schema) {
int memoizedSerializedSize = getMemoizedSerializedSize();
if (memoizedSerializedSize == -1) {
memoizedSerializedSize = schema.getSerializedSize(this);
setMemoizedSerializedSize(memoizedSerializedSize);
}
return memoizedSerializedSize;
}
/** 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 List list) {
Builder.addAll(values, list);
}
/** Interface for an enum which signifies which field in a {@code oneof} was specified. */
protected interface InternalOneOfEnum {
/**
* Retrieves the field number of the field which was set in this {@code oneof}, or {@code 0} if
* none were.
*/
int getNumber();
}
/**
* 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 {
// because we take the minimum of an int and a long, result is guaranteed to be
// less than or equal to Integer.MAX_INT so this cast is safe
int result = (int) super.skip(Math.min(n, limit));
if (result >= 0) {
// if the superclass adheres to the contract for skip, this condition is always true
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).";
}
// We check nulls as we iterate to avoid iterating over values twice.
private static void addAllCheckingNulls(Iterable values, List list) {
if (list instanceof ArrayList && values instanceof Collection) {
((ArrayList) list).ensureCapacity(list.size() + ((Collection) values).size());
}
int begin = list.size();
for (T value : values) {
if (value == null) {
// encountered a null value so we must undo our modifications prior to throwing
String message = "Element at index " + (list.size() - begin) + " is null.";
for (int i = list.size() - 1; i >= begin; i--) {
list.remove(i);
}
throw new NullPointerException(message);
}
list.add(value);
}
}
/** Construct an UninitializedMessageException reporting missing fields in the given message. */
protected static UninitializedMessageException newUninitializedMessageException(
MessageLite message) {
return new UninitializedMessageException(message);
}
// For binary compatibility.
@Deprecated
protected static void addAll(final Iterable values, final Collection list) {
addAll(values, (List) list);
}
/**
* 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.
*/
protected static void addAll(final Iterable values, final List list) {
checkNotNull(values);
if (values instanceof LazyStringList) {
// For StringOrByteStringLists, check the underlying elements to avoid
// forcing conversions of ByteStrings to Strings.
// TODO: Could we just prohibit nulls in all protobuf lists and get rid of this? Is
// if even possible to hit this condition as all protobuf methods check for null first,
// right?
List lazyValues = ((LazyStringList) values).getUnderlyingElements();
LazyStringList lazyList = (LazyStringList) list;
int begin = list.size();
for (Object value : lazyValues) {
if (value == null) {
// encountered a null value so we must undo our modifications prior to throwing
String message = "Element at index " + (lazyList.size() - begin) + " is null.";
for (int i = lazyList.size() - 1; i >= begin; i--) {
lazyList.remove(i);
}
throw new NullPointerException(message);
}
if (value instanceof ByteString) {
lazyList.add((ByteString) value);
} else {
lazyList.add((String) value);
}
}
} else {
if (values instanceof PrimitiveNonBoxingCollection) {
list.addAll((Collection) values);
} else {
addAllCheckingNulls(values, list);
}
}
}
}
}
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