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Diffstat (limited to 'java/src/main/java/com/google/protobuf/MessageReflection.java')
| -rw-r--r-- | java/src/main/java/com/google/protobuf/MessageReflection.java | 931 |
1 files changed, 931 insertions, 0 deletions
diff --git a/java/src/main/java/com/google/protobuf/MessageReflection.java b/java/src/main/java/com/google/protobuf/MessageReflection.java new file mode 100644 index 0000000..edb5b5c --- /dev/null +++ b/java/src/main/java/com/google/protobuf/MessageReflection.java @@ -0,0 +1,931 @@ +// 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 com.google.protobuf.Descriptors.FieldDescriptor; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.List; +import java.util.Map; +import java.util.TreeMap; + +/** + * Reflection utility methods shared by both mutable and immutable messages. + * + * @author liujisi@google.com (Pherl Liu) + */ +class MessageReflection { + + static void writeMessageTo(Message message, CodedOutputStream output, + boolean alwaysWriteRequiredFields) + throws IOException { + final boolean isMessageSet = + message.getDescriptorForType().getOptions().getMessageSetWireFormat(); + + Map<FieldDescriptor, Object> fields = message.getAllFields(); + if (alwaysWriteRequiredFields) { + fields = new TreeMap<FieldDescriptor, Object>(fields); + for (final FieldDescriptor field : + message.getDescriptorForType().getFields()) { + if (field.isRequired() && !fields.containsKey(field)) { + fields.put(field, message.getField(field)); + } + } + } + for (final Map.Entry<Descriptors.FieldDescriptor, Object> entry : + fields.entrySet()) { + final Descriptors.FieldDescriptor field = entry.getKey(); + final Object value = entry.getValue(); + if (isMessageSet && field.isExtension() && + field.getType() == Descriptors.FieldDescriptor.Type.MESSAGE && + !field.isRepeated()) { + output.writeMessageSetExtension(field.getNumber(), (Message) value); + } else { + FieldSet.writeField(field, value, output); + } + } + + final UnknownFieldSet unknownFields = message.getUnknownFields(); + if (isMessageSet) { + unknownFields.writeAsMessageSetTo(output); + } else { + unknownFields.writeTo(output); + } + } + + static int getSerializedSize(Message message) { + int size = 0; + final boolean isMessageSet = + message.getDescriptorForType().getOptions().getMessageSetWireFormat(); + + for (final Map.Entry<Descriptors.FieldDescriptor, Object> entry : + message.getAllFields().entrySet()) { + final Descriptors.FieldDescriptor field = entry.getKey(); + final Object value = entry.getValue(); + if (isMessageSet && field.isExtension() && + field.getType() == Descriptors.FieldDescriptor.Type.MESSAGE && + !field.isRepeated()) { + size += CodedOutputStream.computeMessageSetExtensionSize( + field.getNumber(), (Message) value); + } else { + size += FieldSet.computeFieldSize(field, value); + } + } + + final UnknownFieldSet unknownFields = message.getUnknownFields(); + if (isMessageSet) { + size += unknownFields.getSerializedSizeAsMessageSet(); + } else { + size += unknownFields.getSerializedSize(); + } + return size; + } + + static String delimitWithCommas(List<String> parts) { + StringBuilder result = new StringBuilder(); + for (String part : parts) { + if (result.length() > 0) { + result.append(", "); + } + result.append(part); + } + return result.toString(); + } + + @SuppressWarnings("unchecked") + static boolean isInitialized(MessageOrBuilder message) { + // Check that all required fields are present. + for (final Descriptors.FieldDescriptor field : message + .getDescriptorForType() + .getFields()) { + if (field.isRequired()) { + if (!message.hasField(field)) { + return false; + } + } + } + + // Check that embedded messages are initialized. + for (final Map.Entry<Descriptors.FieldDescriptor, Object> entry : + message.getAllFields().entrySet()) { + final Descriptors.FieldDescriptor field = entry.getKey(); + if (field.getJavaType() == Descriptors.FieldDescriptor.JavaType.MESSAGE) { + if (field.isRepeated()) { + for (final Message element + : (List<Message>) entry.getValue()) { + if (!element.isInitialized()) { + return false; + } + } + } else { + if (!((Message) entry.getValue()).isInitialized()) { + return false; + } + } + } + } + + return true; + } + + private static String subMessagePrefix(final String prefix, + final Descriptors.FieldDescriptor field, + final int index) { + final StringBuilder result = new StringBuilder(prefix); + if (field.isExtension()) { + result.append('(') + .append(field.getFullName()) + .append(')'); + } else { + result.append(field.getName()); + } + if (index != -1) { + result.append('[') + .append(index) + .append(']'); + } + result.append('.'); + return result.toString(); + } + + private static void findMissingFields(final MessageOrBuilder message, + final String prefix, + final List<String> results) { + for (final Descriptors.FieldDescriptor field : + message.getDescriptorForType().getFields()) { + if (field.isRequired() && !message.hasField(field)) { + results.add(prefix + field.getName()); + } + } + + for (final Map.Entry<Descriptors.FieldDescriptor, Object> entry : + message.getAllFields().entrySet()) { + final Descriptors.FieldDescriptor field = entry.getKey(); + final Object value = entry.getValue(); + + if (field.getJavaType() == Descriptors.FieldDescriptor.JavaType.MESSAGE) { + if (field.isRepeated()) { + int i = 0; + for (final Object element : (List) value) { + findMissingFields((MessageOrBuilder) element, + subMessagePrefix(prefix, field, i++), + results); + } + } else { + if (message.hasField(field)) { + findMissingFields((MessageOrBuilder) value, + subMessagePrefix(prefix, field, -1), + results); + } + } + } + } + } + + /** + * Populates {@code this.missingFields} with the full "path" of each missing + * required field in the given message. + */ + static List<String> findMissingFields( + final MessageOrBuilder message) { + final List<String> results = new ArrayList<String>(); + findMissingFields(message, "", results); + return results; + } + + static interface MergeTarget { + enum ContainerType { + MESSAGE, EXTENSION_SET + } + + /** + * Returns the descriptor for the target. + */ + public Descriptors.Descriptor getDescriptorForType(); + + public ContainerType getContainerType(); + + public ExtensionRegistry.ExtensionInfo findExtensionByName( + ExtensionRegistry registry, String name); + + public ExtensionRegistry.ExtensionInfo findExtensionByNumber( + ExtensionRegistry registry, Descriptors.Descriptor containingType, + int fieldNumber); + + /** + * Obtains the value of the given field, or the default value if it is not + * set. For primitive fields, the boxed primitive value is returned. For + * enum fields, the EnumValueDescriptor for the value is returned. For + * embedded message fields, the sub-message is returned. For repeated + * fields, a java.util.List is returned. + */ + public Object getField(Descriptors.FieldDescriptor field); + + /** + * Returns true if the given field is set. This is exactly equivalent to + * calling the generated "has" accessor method corresponding to the field. + * + * @throws IllegalArgumentException The field is a repeated field, or {@code + * field.getContainingType() != getDescriptorForType()}. + */ + boolean hasField(Descriptors.FieldDescriptor field); + + /** + * Sets a field to the given value. The value must be of the correct type + * for this field, i.e. the same type that + * {@link Message#getField(Descriptors.FieldDescriptor)} + * would return. + */ + MergeTarget setField(Descriptors.FieldDescriptor field, Object value); + + /** + * Clears the field. This is exactly equivalent to calling the generated + * "clear" accessor method corresponding to the field. + */ + MergeTarget clearField(Descriptors.FieldDescriptor field); + + /** + * Sets an element of a repeated field to the given value. The value must + * be of the correct type for this field, i.e. the same type that {@link + * Message#getRepeatedField(Descriptors.FieldDescriptor, int)} would return. + * + * @throws IllegalArgumentException The field is not a repeated field, or + * {@code field.getContainingType() != + * getDescriptorForType()}. + */ + MergeTarget setRepeatedField(Descriptors.FieldDescriptor field, + int index, Object value); + + /** + * Like {@code setRepeatedField}, but appends the value as a new element. + * + * @throws IllegalArgumentException The field is not a repeated field, or + * {@code field.getContainingType() != + * getDescriptorForType()}. + */ + MergeTarget addRepeatedField(Descriptors.FieldDescriptor field, + Object value); + + /** + * Returns true if the given oneof is set. + * + * @throws IllegalArgumentException if + * {@code oneof.getContainingType() != getDescriptorForType()}. + */ + boolean hasOneof(Descriptors.OneofDescriptor oneof); + + /** + * Clears the oneof. This is exactly equivalent to calling the generated + * "clear" accessor method corresponding to the oneof. + */ + MergeTarget clearOneof(Descriptors.OneofDescriptor oneof); + + /** + * Obtains the FieldDescriptor if the given oneof is set. Returns null + * if no field is set. + */ + Descriptors.FieldDescriptor getOneofFieldDescriptor(Descriptors.OneofDescriptor oneof); + + /** + * Parse the input stream into a sub field group defined based on either + * FieldDescriptor or the default instance. + */ + Object parseGroup(CodedInputStream input, ExtensionRegistryLite registry, + Descriptors.FieldDescriptor descriptor, Message defaultInstance) + throws IOException; + + /** + * Parse the input stream into a sub field message defined based on either + * FieldDescriptor or the default instance. + */ + Object parseMessage(CodedInputStream input, ExtensionRegistryLite registry, + Descriptors.FieldDescriptor descriptor, Message defaultInstance) + throws IOException; + + /** + * Parse from a ByteString into a sub field message defined based on either + * FieldDescriptor or the default instance. There isn't a varint indicating + * the length of the message at the beginning of the input ByteString. + */ + Object parseMessageFromBytes( + ByteString bytes, ExtensionRegistryLite registry, + Descriptors.FieldDescriptor descriptor, Message defaultInstance) + throws IOException; + + /** + * Read a primitive field from input. Note that builders and mutable + * messages may use different Java types to represent a primtive field. + */ + Object readPrimitiveField( + CodedInputStream input, WireFormat.FieldType type, + boolean checkUtf8) throws IOException; + + /** + * Returns a new merge target for a sub-field. When defaultInstance is + * provided, it indicates the descriptor is for an extension type, and + * implementations should create a new instance from the defaultInstance + * prototype directly. + */ + MergeTarget newMergeTargetForField( + Descriptors.FieldDescriptor descriptor, + Message defaultInstance); + + /** + * Finishes the merge and returns the underlying object. + */ + Object finish(); + } + + static class BuilderAdapter implements MergeTarget { + + private final Message.Builder builder; + + public Descriptors.Descriptor getDescriptorForType() { + return builder.getDescriptorForType(); + } + + public BuilderAdapter(Message.Builder builder) { + this.builder = builder; + } + + public Object getField(Descriptors.FieldDescriptor field) { + return builder.getField(field); + } + + @Override + public boolean hasField(Descriptors.FieldDescriptor field) { + return builder.hasField(field); + } + + public MergeTarget setField(Descriptors.FieldDescriptor field, + Object value) { + builder.setField(field, value); + return this; + } + + public MergeTarget clearField(Descriptors.FieldDescriptor field) { + builder.clearField(field); + return this; + } + + public MergeTarget setRepeatedField( + Descriptors.FieldDescriptor field, int index, Object value) { + builder.setRepeatedField(field, index, value); + return this; + } + + public MergeTarget addRepeatedField( + Descriptors.FieldDescriptor field, Object value) { + builder.addRepeatedField(field, value); + return this; + } + + @Override + public boolean hasOneof(Descriptors.OneofDescriptor oneof) { + return builder.hasOneof(oneof); + } + + @Override + public MergeTarget clearOneof(Descriptors.OneofDescriptor oneof) { + builder.clearOneof(oneof); + return this; + } + + @Override + public Descriptors.FieldDescriptor getOneofFieldDescriptor(Descriptors.OneofDescriptor oneof) { + return builder.getOneofFieldDescriptor(oneof); + } + + public ContainerType getContainerType() { + return ContainerType.MESSAGE; + } + + public ExtensionRegistry.ExtensionInfo findExtensionByName( + ExtensionRegistry registry, String name) { + return registry.findImmutableExtensionByName(name); + } + + public ExtensionRegistry.ExtensionInfo findExtensionByNumber( + ExtensionRegistry registry, Descriptors.Descriptor containingType, + int fieldNumber) { + return registry.findImmutableExtensionByNumber(containingType, + fieldNumber); + } + + public Object parseGroup(CodedInputStream input, + ExtensionRegistryLite extensionRegistry, + Descriptors.FieldDescriptor field, Message defaultInstance) + throws IOException { + Message.Builder subBuilder; + // When default instance is not null. The field is an extension field. + if (defaultInstance != null) { + subBuilder = defaultInstance.newBuilderForType(); + } else { + subBuilder = builder.newBuilderForField(field); + } + if (!field.isRepeated()) { + Message originalMessage = (Message) getField(field); + if (originalMessage != null) { + subBuilder.mergeFrom(originalMessage); + } + } + input.readGroup(field.getNumber(), subBuilder, extensionRegistry); + return subBuilder.buildPartial(); + } + + public Object parseMessage(CodedInputStream input, + ExtensionRegistryLite extensionRegistry, + Descriptors.FieldDescriptor field, Message defaultInstance) + throws IOException { + Message.Builder subBuilder; + // When default instance is not null. The field is an extension field. + if (defaultInstance != null) { + subBuilder = defaultInstance.newBuilderForType(); + } else { + subBuilder = builder.newBuilderForField(field); + } + if (!field.isRepeated()) { + Message originalMessage = (Message) getField(field); + if (originalMessage != null) { + subBuilder.mergeFrom(originalMessage); + } + } + input.readMessage(subBuilder, extensionRegistry); + return subBuilder.buildPartial(); + } + + public Object parseMessageFromBytes(ByteString bytes, + ExtensionRegistryLite extensionRegistry, + Descriptors.FieldDescriptor field, Message defaultInstance) + throws IOException { + Message.Builder subBuilder; + // When default instance is not null. The field is an extension field. + if (defaultInstance != null) { + subBuilder = defaultInstance.newBuilderForType(); + } else { + subBuilder = builder.newBuilderForField(field); + } + if (!field.isRepeated()) { + Message originalMessage = (Message) getField(field); + if (originalMessage != null) { + subBuilder.mergeFrom(originalMessage); + } + } + subBuilder.mergeFrom(bytes, extensionRegistry); + return subBuilder.buildPartial(); + } + + public MergeTarget newMergeTargetForField(Descriptors.FieldDescriptor field, + Message defaultInstance) { + if (defaultInstance != null) { + return new BuilderAdapter( + defaultInstance.newBuilderForType()); + } else { + return new BuilderAdapter(builder.newBuilderForField(field)); + } + } + + public Object readPrimitiveField( + CodedInputStream input, WireFormat.FieldType type, + boolean checkUtf8) throws IOException { + return FieldSet.readPrimitiveField(input, type, checkUtf8); + } + + public Object finish() { + return builder.buildPartial(); + } + } + + + static class ExtensionAdapter implements MergeTarget { + + private final FieldSet<Descriptors.FieldDescriptor> extensions; + + ExtensionAdapter(FieldSet<Descriptors.FieldDescriptor> extensions) { + this.extensions = extensions; + } + + public Descriptors.Descriptor getDescriptorForType() { + throw new UnsupportedOperationException( + "getDescriptorForType() called on FieldSet object"); + } + + public Object getField(Descriptors.FieldDescriptor field) { + return extensions.getField(field); + } + + public boolean hasField(Descriptors.FieldDescriptor field) { + return extensions.hasField(field); + } + + public MergeTarget setField(Descriptors.FieldDescriptor field, + Object value) { + extensions.setField(field, value); + return this; + } + + public MergeTarget clearField(Descriptors.FieldDescriptor field) { + extensions.clearField(field); + return this; + } + + public MergeTarget setRepeatedField( + Descriptors.FieldDescriptor field, int index, Object value) { + extensions.setRepeatedField(field, index, value); + return this; + } + + public MergeTarget addRepeatedField( + Descriptors.FieldDescriptor field, Object value) { + extensions.addRepeatedField(field, value); + return this; + } + + @Override + public boolean hasOneof(Descriptors.OneofDescriptor oneof) { + return false; + } + + @Override + public MergeTarget clearOneof(Descriptors.OneofDescriptor oneof) { + // Nothing to clear. + return this; + } + + @Override + public Descriptors.FieldDescriptor getOneofFieldDescriptor(Descriptors.OneofDescriptor oneof) { + return null; + } + + public ContainerType getContainerType() { + return ContainerType.EXTENSION_SET; + } + + public ExtensionRegistry.ExtensionInfo findExtensionByName( + ExtensionRegistry registry, String name) { + return registry.findImmutableExtensionByName(name); + } + + public ExtensionRegistry.ExtensionInfo findExtensionByNumber( + ExtensionRegistry registry, Descriptors.Descriptor containingType, + int fieldNumber) { + return registry.findImmutableExtensionByNumber(containingType, + fieldNumber); + } + + public Object parseGroup(CodedInputStream input, + ExtensionRegistryLite registry, Descriptors.FieldDescriptor field, + Message defaultInstance) throws IOException { + Message.Builder subBuilder = + defaultInstance.newBuilderForType(); + if (!field.isRepeated()) { + Message originalMessage = (Message) getField(field); + if (originalMessage != null) { + subBuilder.mergeFrom(originalMessage); + } + } + input.readGroup(field.getNumber(), subBuilder, registry); + return subBuilder.buildPartial(); + } + + public Object parseMessage(CodedInputStream input, + ExtensionRegistryLite registry, Descriptors.FieldDescriptor field, + Message defaultInstance) throws IOException { + Message.Builder subBuilder = + defaultInstance.newBuilderForType(); + if (!field.isRepeated()) { + Message originalMessage = (Message) getField(field); + if (originalMessage != null) { + subBuilder.mergeFrom(originalMessage); + } + } + input.readMessage(subBuilder, registry); + return subBuilder.buildPartial(); + } + + public Object parseMessageFromBytes(ByteString bytes, + ExtensionRegistryLite registry, Descriptors.FieldDescriptor field, + Message defaultInstance) throws IOException { + Message.Builder subBuilder = defaultInstance.newBuilderForType(); + if (!field.isRepeated()) { + Message originalMessage = (Message) getField(field); + if (originalMessage != null) { + subBuilder.mergeFrom(originalMessage); + } + } + subBuilder.mergeFrom(bytes, registry); + return subBuilder.buildPartial(); + } + + public MergeTarget newMergeTargetForField( + Descriptors.FieldDescriptor descriptor, Message defaultInstance) { + throw new UnsupportedOperationException( + "newMergeTargetForField() called on FieldSet object"); + } + + public Object readPrimitiveField( + CodedInputStream input, WireFormat.FieldType type, + boolean checkUtf8) throws IOException { + return FieldSet.readPrimitiveField(input, type, checkUtf8); + } + + public Object finish() { + throw new UnsupportedOperationException( + "finish() called on FieldSet object"); + } + } + + /** + * Parses a single field into MergeTarget. The target can be Message.Builder, + * FieldSet or MutableMessage. + * + * Package-private because it is used by GeneratedMessage.ExtendableMessage. + * + * @param tag The tag, which should have already been read. + * @return {@code true} unless the tag is an end-group tag. + */ + static boolean mergeFieldFrom( + CodedInputStream input, + UnknownFieldSet.Builder unknownFields, + ExtensionRegistryLite extensionRegistry, + Descriptors.Descriptor type, + MergeTarget target, + int tag) throws IOException { + if (type.getOptions().getMessageSetWireFormat() && + tag == WireFormat.MESSAGE_SET_ITEM_TAG) { + mergeMessageSetExtensionFromCodedStream( + input, unknownFields, extensionRegistry, type, target); + return true; + } + + final int wireType = WireFormat.getTagWireType(tag); + final int fieldNumber = WireFormat.getTagFieldNumber(tag); + + final Descriptors.FieldDescriptor field; + Message defaultInstance = null; + + if (type.isExtensionNumber(fieldNumber)) { + // extensionRegistry may be either ExtensionRegistry or + // ExtensionRegistryLite. Since the type we are parsing is a full + // message, only a full ExtensionRegistry could possibly contain + // extensions of it. Otherwise we will treat the registry as if it + // were empty. + if (extensionRegistry instanceof ExtensionRegistry) { + final ExtensionRegistry.ExtensionInfo extension = + target.findExtensionByNumber((ExtensionRegistry) extensionRegistry, + type, fieldNumber); + if (extension == null) { + field = null; + } else { + field = extension.descriptor; + defaultInstance = extension.defaultInstance; + if (defaultInstance == null && + field.getJavaType() + == Descriptors.FieldDescriptor.JavaType.MESSAGE) { + throw new IllegalStateException( + "Message-typed extension lacked default instance: " + + field.getFullName()); + } + } + } else { + field = null; + } + } else if (target.getContainerType() == MergeTarget.ContainerType.MESSAGE) { + field = type.findFieldByNumber(fieldNumber); + } else { + field = null; + } + + boolean unknown = false; + boolean packed = false; + if (field == null) { + unknown = true; // Unknown field. + } else if (wireType == FieldSet.getWireFormatForFieldType( + field.getLiteType(), + false /* isPacked */)) { + packed = false; + } else if (field.isPackable() && + wireType == FieldSet.getWireFormatForFieldType( + field.getLiteType(), + true /* isPacked */)) { + packed = true; + } else { + unknown = true; // Unknown wire type. + } + + if (unknown) { // Unknown field or wrong wire type. Skip. + return unknownFields.mergeFieldFrom(tag, input); + } + + if (packed) { + final int length = input.readRawVarint32(); + final int limit = input.pushLimit(length); + if (field.getLiteType() == WireFormat.FieldType.ENUM) { + while (input.getBytesUntilLimit() > 0) { + final int rawValue = input.readEnum(); + final Object value = field.getEnumType().findValueByNumber(rawValue); + if (value == null) { + // If the number isn't recognized as a valid value for this + // enum, drop it (don't even add it to unknownFields). + return true; + } + target.addRepeatedField(field, value); + } + } else { + while (input.getBytesUntilLimit() > 0) { + final Object value = + target.readPrimitiveField(input, field.getLiteType(), field.needsUtf8Check()); + target.addRepeatedField(field, value); + } + } + input.popLimit(limit); + } else { + final Object value; + switch (field.getType()) { + case GROUP: { + value = target + .parseGroup(input, extensionRegistry, field, defaultInstance); + break; + } + case MESSAGE: { + value = target + .parseMessage(input, extensionRegistry, field, defaultInstance); + break; + } + case ENUM: + final int rawValue = input.readEnum(); + value = field.getEnumType().findValueByNumber(rawValue); + // If the number isn't recognized as a valid value for this enum, + // drop it. + if (value == null) { + unknownFields.mergeVarintField(fieldNumber, rawValue); + return true; + } + break; + default: + value = target.readPrimitiveField(input, field.getLiteType(), field.needsUtf8Check()); + break; + } + + if (field.isRepeated()) { + target.addRepeatedField(field, value); + } else { + target.setField(field, value); + } + } + + return true; + } + + /** + * Called by {@code #mergeFieldFrom()} to parse a MessageSet extension into + * MergeTarget. + */ + private static void mergeMessageSetExtensionFromCodedStream( + CodedInputStream input, + UnknownFieldSet.Builder unknownFields, + ExtensionRegistryLite extensionRegistry, + Descriptors.Descriptor type, + MergeTarget target) throws IOException { + + // The wire format for MessageSet is: + // message MessageSet { + // repeated group Item = 1 { + // required int32 typeId = 2; + // required bytes message = 3; + // } + // } + // "typeId" is the extension's field number. The extension can only be + // a message type, where "message" contains the encoded bytes of that + // message. + // + // In practice, we will probably never see a MessageSet item in which + // the message appears before the type ID, or where either field does not + // appear exactly once. However, in theory such cases are valid, so we + // should be prepared to accept them. + + int typeId = 0; + ByteString rawBytes = null; // If we encounter "message" before "typeId" + ExtensionRegistry.ExtensionInfo extension = null; + + // Read bytes from input, if we get it's type first then parse it eagerly, + // otherwise we store the raw bytes in a local variable. + while (true) { + final int tag = input.readTag(); + if (tag == 0) { + break; + } + + if (tag == WireFormat.MESSAGE_SET_TYPE_ID_TAG) { + typeId = input.readUInt32(); + if (typeId != 0) { + // extensionRegistry may be either ExtensionRegistry or + // ExtensionRegistryLite. Since the type we are parsing is a full + // message, only a full ExtensionRegistry could possibly contain + // extensions of it. Otherwise we will treat the registry as if it + // were empty. + if (extensionRegistry instanceof ExtensionRegistry) { + extension = target.findExtensionByNumber( + (ExtensionRegistry) extensionRegistry, type, typeId); + } + } + + } else if (tag == WireFormat.MESSAGE_SET_MESSAGE_TAG) { + if (typeId != 0) { + if (extension != null && + ExtensionRegistryLite.isEagerlyParseMessageSets()) { + // We already know the type, so we can parse directly from the + // input with no copying. Hooray! + eagerlyMergeMessageSetExtension( + input, extension, extensionRegistry, target); + rawBytes = null; + continue; + } + } + // We haven't seen a type ID yet or we want parse message lazily. + rawBytes = input.readBytes(); + + } else { // Unknown tag. Skip it. + if (!input.skipField(tag)) { + break; // End of group + } + } + } + input.checkLastTagWas(WireFormat.MESSAGE_SET_ITEM_END_TAG); + + // Process the raw bytes. + if (rawBytes != null && typeId != 0) { // Zero is not a valid type ID. + if (extension != null) { // We known the type + mergeMessageSetExtensionFromBytes( + rawBytes, extension, extensionRegistry, target); + } else { // We don't know how to parse this. Ignore it. + if (rawBytes != null) { + unknownFields.mergeField(typeId, UnknownFieldSet.Field.newBuilder() + .addLengthDelimited(rawBytes).build()); + } + } + } + } + + private static void mergeMessageSetExtensionFromBytes( + ByteString rawBytes, + ExtensionRegistry.ExtensionInfo extension, + ExtensionRegistryLite extensionRegistry, + MergeTarget target) throws IOException { + + Descriptors.FieldDescriptor field = extension.descriptor; + boolean hasOriginalValue = target.hasField(field); + + if (hasOriginalValue || ExtensionRegistryLite.isEagerlyParseMessageSets()) { + // If the field already exists, we just parse the field. + Object value = target.parseMessageFromBytes( + rawBytes, extensionRegistry,field, extension.defaultInstance); + target.setField(field, value); + } else { + // Use LazyField to load MessageSet lazily. + LazyField lazyField = new LazyField( + extension.defaultInstance, extensionRegistry, rawBytes); + target.setField(field, lazyField); + } + } + + private static void eagerlyMergeMessageSetExtension( + CodedInputStream input, + ExtensionRegistry.ExtensionInfo extension, + ExtensionRegistryLite extensionRegistry, + MergeTarget target) throws IOException { + Descriptors.FieldDescriptor field = extension.descriptor; + Object value = target.parseMessage(input, extensionRegistry, field, + extension.defaultInstance); + target.setField(field, value); + } +} |