com.google.protobuf.UnknownFieldSetLite Maven / Gradle / Ivy
Show all versions of protobuf-javalite Show documentation
// 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 java.io.IOException;
import java.util.Arrays;
/**
* {@code UnknownFieldSetLite} is used to keep track of fields which were seen when parsing a
* protocol message but whose field numbers or types are unrecognized. This most frequently occurs
* when new fields are added to a message type and then messages containing those fields are read by
* old software that was compiled before the new types were added.
*
* For use by generated code only.
*
* @author [email protected] (Daniel Weis)
*/
public final class UnknownFieldSetLite {
// Arbitrarily chosen.
// TODO: Tune this number?
private static final int MIN_CAPACITY = 8;
private static final UnknownFieldSetLite DEFAULT_INSTANCE =
new UnknownFieldSetLite(0, new int[0], new Object[0], /* isMutable= */ false);
/**
* Get an empty {@code UnknownFieldSetLite}.
*
*
For use by generated code only.
*/
public static UnknownFieldSetLite getDefaultInstance() {
return DEFAULT_INSTANCE;
}
/** Returns a new mutable instance. */
static UnknownFieldSetLite newInstance() {
return new UnknownFieldSetLite();
}
/**
* Returns a mutable {@code UnknownFieldSetLite} that is the composite of {@code first} and {@code
* second}.
*/
static UnknownFieldSetLite mutableCopyOf(UnknownFieldSetLite first, UnknownFieldSetLite second) {
int count = first.count + second.count;
int[] tags = Arrays.copyOf(first.tags, count);
System.arraycopy(second.tags, 0, tags, first.count, second.count);
Object[] objects = Arrays.copyOf(first.objects, count);
System.arraycopy(second.objects, 0, objects, first.count, second.count);
return new UnknownFieldSetLite(count, tags, objects, /* isMutable= */ true);
}
/** The number of elements in the set. */
private int count;
/** The tag numbers for the elements in the set. */
private int[] tags;
/** The boxed values of the elements in the set. */
private Object[] objects;
/** The lazily computed serialized size of the set. */
private int memoizedSerializedSize = -1;
/** Indicates that this object is mutable. */
private boolean isMutable;
/** Constructs a mutable {@code UnknownFieldSetLite}. */
private UnknownFieldSetLite() {
this(0, new int[MIN_CAPACITY], new Object[MIN_CAPACITY], /* isMutable= */ true);
}
/** Constructs the {@code UnknownFieldSetLite}. */
private UnknownFieldSetLite(int count, int[] tags, Object[] objects, boolean isMutable) {
this.count = count;
this.tags = tags;
this.objects = objects;
this.isMutable = isMutable;
}
/**
* Marks this object as immutable.
*
*
Future calls to methods that attempt to modify this object will throw.
*/
public void makeImmutable() {
if (this.isMutable) {
this.isMutable = false;
}
}
/** Throws an {@link UnsupportedOperationException} if immutable. */
void checkMutable() {
if (!isMutable) {
throw new UnsupportedOperationException();
}
}
/**
* Serializes the set and writes it to {@code output}.
*
*
For use by generated code only.
*/
public void writeTo(CodedOutputStream output) throws IOException {
for (int i = 0; i < count; i++) {
int tag = tags[i];
int fieldNumber = WireFormat.getTagFieldNumber(tag);
switch (WireFormat.getTagWireType(tag)) {
case WireFormat.WIRETYPE_VARINT:
output.writeUInt64(fieldNumber, (Long) objects[i]);
break;
case WireFormat.WIRETYPE_FIXED32:
output.writeFixed32(fieldNumber, (Integer) objects[i]);
break;
case WireFormat.WIRETYPE_FIXED64:
output.writeFixed64(fieldNumber, (Long) objects[i]);
break;
case WireFormat.WIRETYPE_LENGTH_DELIMITED:
output.writeBytes(fieldNumber, (ByteString) objects[i]);
break;
case WireFormat.WIRETYPE_START_GROUP:
output.writeTag(fieldNumber, WireFormat.WIRETYPE_START_GROUP);
((UnknownFieldSetLite) objects[i]).writeTo(output);
output.writeTag(fieldNumber, WireFormat.WIRETYPE_END_GROUP);
break;
default:
throw InvalidProtocolBufferException.invalidWireType();
}
}
}
/**
* Serializes the set and writes it to {@code output} using {@code MessageSet} wire format.
*
*
For use by generated code only.
*/
public void writeAsMessageSetTo(CodedOutputStream output) throws IOException {
for (int i = 0; i < count; i++) {
int fieldNumber = WireFormat.getTagFieldNumber(tags[i]);
output.writeRawMessageSetExtension(fieldNumber, (ByteString) objects[i]);
}
}
/** Serializes the set and writes it to {@code writer} using {@code MessageSet} wire format. */
void writeAsMessageSetTo(Writer writer) throws IOException {
if (writer.fieldOrder() == Writer.FieldOrder.DESCENDING) {
// Write fields in descending order.
for (int i = count - 1; i >= 0; i--) {
int fieldNumber = WireFormat.getTagFieldNumber(tags[i]);
writer.writeMessageSetItem(fieldNumber, objects[i]);
}
} else {
// Write fields in ascending order.
for (int i = 0; i < count; i++) {
int fieldNumber = WireFormat.getTagFieldNumber(tags[i]);
writer.writeMessageSetItem(fieldNumber, objects[i]);
}
}
}
/** Serializes the set and writes it to {@code writer}. */
public void writeTo(Writer writer) throws IOException {
if (count == 0) {
return;
}
// TODO: tags are not sorted, so there's no write order guarantees
if (writer.fieldOrder() == Writer.FieldOrder.ASCENDING) {
for (int i = 0; i < count; ++i) {
writeField(tags[i], objects[i], writer);
}
} else {
for (int i = count - 1; i >= 0; --i) {
writeField(tags[i], objects[i], writer);
}
}
}
private static void writeField(int tag, Object object, Writer writer) throws IOException {
int fieldNumber = WireFormat.getTagFieldNumber(tag);
switch (WireFormat.getTagWireType(tag)) {
case WireFormat.WIRETYPE_VARINT:
writer.writeInt64(fieldNumber, (Long) object);
break;
case WireFormat.WIRETYPE_FIXED32:
writer.writeFixed32(fieldNumber, (Integer) object);
break;
case WireFormat.WIRETYPE_FIXED64:
writer.writeFixed64(fieldNumber, (Long) object);
break;
case WireFormat.WIRETYPE_LENGTH_DELIMITED:
writer.writeBytes(fieldNumber, (ByteString) object);
break;
case WireFormat.WIRETYPE_START_GROUP:
if (writer.fieldOrder() == Writer.FieldOrder.ASCENDING) {
writer.writeStartGroup(fieldNumber);
((UnknownFieldSetLite) object).writeTo(writer);
writer.writeEndGroup(fieldNumber);
} else {
writer.writeEndGroup(fieldNumber);
((UnknownFieldSetLite) object).writeTo(writer);
writer.writeStartGroup(fieldNumber);
}
break;
default:
// TODO: Change writeTo to throw IOException?
throw new RuntimeException(InvalidProtocolBufferException.invalidWireType());
}
}
/**
* Get the number of bytes required to encode this field, including field number, using {@code
* MessageSet} wire format.
*/
public int getSerializedSizeAsMessageSet() {
int size = memoizedSerializedSize;
if (size != -1) {
return size;
}
size = 0;
for (int i = 0; i < count; i++) {
int tag = tags[i];
int fieldNumber = WireFormat.getTagFieldNumber(tag);
size +=
CodedOutputStream.computeRawMessageSetExtensionSize(fieldNumber, (ByteString) objects[i]);
}
memoizedSerializedSize = size;
return size;
}
/**
* Get the number of bytes required to encode this set.
*
*
For use by generated code only.
*/
public int getSerializedSize() {
int size = memoizedSerializedSize;
if (size != -1) {
return size;
}
size = 0;
for (int i = 0; i < count; i++) {
int tag = tags[i];
int fieldNumber = WireFormat.getTagFieldNumber(tag);
switch (WireFormat.getTagWireType(tag)) {
case WireFormat.WIRETYPE_VARINT:
size += CodedOutputStream.computeUInt64Size(fieldNumber, (Long) objects[i]);
break;
case WireFormat.WIRETYPE_FIXED32:
size += CodedOutputStream.computeFixed32Size(fieldNumber, (Integer) objects[i]);
break;
case WireFormat.WIRETYPE_FIXED64:
size += CodedOutputStream.computeFixed64Size(fieldNumber, (Long) objects[i]);
break;
case WireFormat.WIRETYPE_LENGTH_DELIMITED:
size += CodedOutputStream.computeBytesSize(fieldNumber, (ByteString) objects[i]);
break;
case WireFormat.WIRETYPE_START_GROUP:
size +=
CodedOutputStream.computeTagSize(fieldNumber) * 2
+ ((UnknownFieldSetLite) objects[i]).getSerializedSize();
break;
default:
throw new IllegalStateException(InvalidProtocolBufferException.invalidWireType());
}
}
memoizedSerializedSize = size;
return size;
}
private static boolean tagsEquals(int[] tags1, int[] tags2, int count) {
for (int i = 0; i < count; ++i) {
if (tags1[i] != tags2[i]) {
return false;
}
}
return true;
}
private static boolean objectsEquals(Object[] objects1, Object[] objects2, int count) {
for (int i = 0; i < count; ++i) {
if (!objects1[i].equals(objects2[i])) {
return false;
}
}
return true;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof UnknownFieldSetLite)) {
return false;
}
UnknownFieldSetLite other = (UnknownFieldSetLite) obj;
if (count != other.count
|| !tagsEquals(tags, other.tags, count)
|| !objectsEquals(objects, other.objects, count)) {
return false;
}
return true;
}
private static int hashCode(int[] tags, int count) {
int hashCode = 17;
for (int i = 0; i < count; ++i) {
hashCode = 31 * hashCode + tags[i];
}
return hashCode;
}
private static int hashCode(Object[] objects, int count) {
int hashCode = 17;
for (int i = 0; i < count; ++i) {
hashCode = 31 * hashCode + objects[i].hashCode();
}
return hashCode;
}
@Override
public int hashCode() {
int hashCode = 17;
hashCode = 31 * hashCode + count;
hashCode = 31 * hashCode + hashCode(tags, count);
hashCode = 31 * hashCode + hashCode(objects, count);
return hashCode;
}
/**
* Prints a String representation of the unknown field set.
*
*
For use by generated code only.
*
* @param buffer the buffer to write to
* @param indent the number of spaces the fields should be indented by
*/
final void printWithIndent(StringBuilder buffer, int indent) {
for (int i = 0; i < count; i++) {
int fieldNumber = WireFormat.getTagFieldNumber(tags[i]);
MessageLiteToString.printField(buffer, indent, String.valueOf(fieldNumber), objects[i]);
}
}
// Package private for unsafe experimental runtime.
void storeField(int tag, Object value) {
checkMutable();
ensureCapacity(count + 1);
tags[count] = tag;
objects[count] = value;
count++;
}
/** Ensures that our arrays are long enough to store more metadata. */
private void ensureCapacity(int minCapacity) {
if (minCapacity > this.tags.length) {
// Increase by at least 50%
int newCapacity = count + count / 2;
// Or new capacity if higher
if (newCapacity < minCapacity) {
newCapacity = minCapacity;
}
// And never less than MIN_CAPACITY
if (newCapacity < MIN_CAPACITY) {
newCapacity = MIN_CAPACITY;
}
this.tags = Arrays.copyOf(this.tags, newCapacity);
this.objects = Arrays.copyOf(this.objects, newCapacity);
}
}
/**
* Parse a single field from {@code input} and merge it into this set.
*
*
For use by generated code only.
*
* @param tag The field's tag number, which was already parsed.
* @return {@code false} if the tag is an end group tag.
*/
boolean mergeFieldFrom(final int tag, final CodedInputStream input) throws IOException {
checkMutable();
final int fieldNumber = WireFormat.getTagFieldNumber(tag);
switch (WireFormat.getTagWireType(tag)) {
case WireFormat.WIRETYPE_VARINT:
storeField(tag, input.readInt64());
return true;
case WireFormat.WIRETYPE_FIXED32:
storeField(tag, input.readFixed32());
return true;
case WireFormat.WIRETYPE_FIXED64:
storeField(tag, input.readFixed64());
return true;
case WireFormat.WIRETYPE_LENGTH_DELIMITED:
storeField(tag, input.readBytes());
return true;
case WireFormat.WIRETYPE_START_GROUP:
final UnknownFieldSetLite subFieldSet = new UnknownFieldSetLite();
subFieldSet.mergeFrom(input);
input.checkLastTagWas(WireFormat.makeTag(fieldNumber, WireFormat.WIRETYPE_END_GROUP));
storeField(tag, subFieldSet);
return true;
case WireFormat.WIRETYPE_END_GROUP:
return false;
default:
throw InvalidProtocolBufferException.invalidWireType();
}
}
/**
* Convenience method for merging a new field containing a single varint value. This is used in
* particular when an unknown enum value is encountered.
*
*
For use by generated code only.
*/
UnknownFieldSetLite mergeVarintField(int fieldNumber, int value) {
checkMutable();
if (fieldNumber == 0) {
throw new IllegalArgumentException("Zero is not a valid field number.");
}
storeField(WireFormat.makeTag(fieldNumber, WireFormat.WIRETYPE_VARINT), (long) value);
return this;
}
/**
* Convenience method for merging a length-delimited field.
*
*
For use by generated code only.
*/
UnknownFieldSetLite mergeLengthDelimitedField(final int fieldNumber, final ByteString value) {
checkMutable();
if (fieldNumber == 0) {
throw new IllegalArgumentException("Zero is not a valid field number.");
}
storeField(WireFormat.makeTag(fieldNumber, WireFormat.WIRETYPE_LENGTH_DELIMITED), value);
return this;
}
/** Parse an entire message from {@code input} and merge its fields into this set. */
private UnknownFieldSetLite mergeFrom(final CodedInputStream input) throws IOException {
// Ensures initialization in mergeFieldFrom.
while (true) {
final int tag = input.readTag();
if (tag == 0 || !mergeFieldFrom(tag, input)) {
break;
}
}
return this;
}
@CanIgnoreReturnValue
UnknownFieldSetLite mergeFrom(UnknownFieldSetLite other) {
if (other.equals(getDefaultInstance())) {
return this;
}
checkMutable();
int newCount = this.count + other.count;
ensureCapacity(newCount);
System.arraycopy(other.tags, 0, tags, this.count, other.count);
System.arraycopy(other.objects, 0, objects, this.count, other.count);
this.count = newCount;
return this;
}
}