From 80b1d62bfcea65c59e2160da71dad84b1bd19cef Mon Sep 17 00:00:00 2001 From: "kenton@google.com" Date: Wed, 29 Jul 2009 01:13:20 +0000 Subject: Submit recent changes from internal branch, including "lite mode" for C++ and Java. See CHANGES.txt for more details. --- src/google/protobuf/message_lite.h | 237 +++++++++++++++++++++++++++++++++++++ 1 file changed, 237 insertions(+) create mode 100644 src/google/protobuf/message_lite.h (limited to 'src/google/protobuf/message_lite.h') diff --git a/src/google/protobuf/message_lite.h b/src/google/protobuf/message_lite.h new file mode 100644 index 00000000..d289d8c7 --- /dev/null +++ b/src/google/protobuf/message_lite.h @@ -0,0 +1,237 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 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. + +// Authors: wink@google.com (Wink Saville), +// kenton@google.com (Kenton Varda) +// Based on original Protocol Buffers design by +// Sanjay Ghemawat, Jeff Dean, and others. +// + +#ifndef GOOGLE_PROTOBUF_MESSAGE_LITE_H__ +#define GOOGLE_PROTOBUF_MESSAGE_LITE_H__ + +#include +#include + +namespace google { +namespace protobuf { + +// Interface to light weight protocol messages. +// +// This interface is implemented by all protocol message objects. Most +// users will be more interested in the Message interface, which is a +// subclass of MessageLite. Use MessageLite instead when you only need +// the subset of features which it supports -- namely, nothing that uses +// descriptors or reflection. You can instruct the protocol compiler +// to generate classes which implement only MessageLite, not the full +// Message interface, by adding the following line to the .proto file: +// +// option optimize_for = LITE_RUNTIME; +// +// This is particularly useful on resource-constrained systems where +// the full protocol buffers runtime library is too big. +// +// Note that on non-constrained systems (e.g. servers) when you need +// to link in lots of protocol definitions, a better way to reduce +// total code footprint is to use optimize_for = CODE_SIZE. This +// will make the generated code smaller while still supporting all the +// same features (at the expense of speed). optimize_for = LITE_RUNTIME +// is best when you only have a small number of message types linked +// into your binary, in which case the size of the protocol buffers +// runtime itself is the biggest problem. +class LIBPROTOBUF_EXPORT MessageLite { + public: + inline MessageLite() {} + virtual ~MessageLite(); + + // Basic Operations ------------------------------------------------ + + // Get the name of this message type, e.g. "foo.bar.BazProto". + virtual string GetTypeName() const = 0; + + // Construct a new instance of the same type. Ownership is passed to the + // caller. + virtual MessageLite* New() const = 0; + + // Clear all fields of the message and set them to their default values. + // Clear() avoids freeing memory, assuming that any memory allocated + // to hold parts of the message will be needed again to hold the next + // message. If you actually want to free the memory used by a Message, + // you must delete it. + virtual void Clear() = 0; + + // Quickly check if all required fields have values set. + virtual bool IsInitialized() const = 0; + + // This is not implemented for Lite messages -- it just returns "(cannot + // determine missing fields for lite message)". However, it is implemented + // for full messages. See message.h. + virtual string InitializationErrorString() const; + + // If |other| is the exact same class as this, calls MergeFrom(). Otherwise, + // results are undefined (probably crash). + virtual void CheckTypeAndMergeFrom(const MessageLite& other) = 0; + + // Parsing --------------------------------------------------------- + // Methods for parsing in protocol buffer format. Most of these are + // just simple wrappers around MergeFromCodedStream(). + + // Fill the message with a protocol buffer parsed from the given input + // stream. Returns false on a read error or if the input is in the + // wrong format. + bool ParseFromCodedStream(io::CodedInputStream* input); + // Like ParseFromCodedStream(), but accepts messages that are missing + // required fields. + bool ParsePartialFromCodedStream(io::CodedInputStream* input); + // Read a protocol buffer from the given zero-copy input stream. If + // successful, the entire input will be consumed. + bool ParseFromZeroCopyStream(io::ZeroCopyInputStream* input); + // Like ParseFromZeroCopyStream(), but accepts messages that are missing + // required fields. + bool ParsePartialFromZeroCopyStream(io::ZeroCopyInputStream* input); + // Read a protocol buffer from the given zero-copy input stream, expecting + // the message to be exactly "size" bytes long. If successful, exactly + // this many bytes will have been consumed from the input. + bool ParseFromBoundedZeroCopyStream(io::ZeroCopyInputStream* input, int size); + // Like ParseFromBoundedZeroCopyStream(), but accepts messages that are + // missing required fields. + bool ParsePartialFromBoundedZeroCopyStream(io::ZeroCopyInputStream* input, + int size); + // Parse a protocol buffer contained in a string. + bool ParseFromString(const string& data); + // Like ParseFromString(), but accepts messages that are missing + // required fields. + bool ParsePartialFromString(const string& data); + // Parse a protocol buffer contained in an array of bytes. + bool ParseFromArray(const void* data, int size); + // Like ParseFromArray(), but accepts messages that are missing + // required fields. + bool ParsePartialFromArray(const void* data, int size); + + + // Reads a protocol buffer from the stream and merges it into this + // Message. Singular fields read from the input overwrite what is + // already in the Message and repeated fields are appended to those + // already present. + // + // It is the responsibility of the caller to call input->LastTagWas() + // (for groups) or input->ConsumedEntireMessage() (for non-groups) after + // this returns to verify that the message's end was delimited correctly. + // + // ParsefromCodedStream() is implemented as Clear() followed by + // MergeFromCodedStream(). + bool MergeFromCodedStream(io::CodedInputStream* input); + + // Like MergeFromCodedStream(), but succeeds even if required fields are + // missing in the input. + // + // MergeFromCodedStream() is just implemented as MergePartialFromCodedStream() + // followed by IsInitialized(). + virtual bool MergePartialFromCodedStream(io::CodedInputStream* input) = 0; + + // Serialization --------------------------------------------------- + // Methods for serializing in protocol buffer format. Most of these + // are just simple wrappers around ByteSize() and SerializeWithCachedSizes(). + + // Write a protocol buffer of this message to the given output. Returns + // false on a write error. If the message is missing required fields, + // this may GOOGLE_CHECK-fail. + bool SerializeToCodedStream(io::CodedOutputStream* output) const; + // Like SerializeToCodedStream(), but allows missing required fields. + bool SerializePartialToCodedStream(io::CodedOutputStream* output) const; + // Write the message to the given zero-copy output stream. All required + // fields must be set. + bool SerializeToZeroCopyStream(io::ZeroCopyOutputStream* output) const; + // Like SerializeToZeroCopyStream(), but allows missing required fields. + bool SerializePartialToZeroCopyStream(io::ZeroCopyOutputStream* output) const; + // Serialize the message and store it in the given string. All required + // fields must be set. + bool SerializeToString(string* output) const; + // Like SerializeToString(), but allows missing required fields. + bool SerializePartialToString(string* output) const; + // Serialize the message and store it in the given byte array. All required + // fields must be set. + bool SerializeToArray(void* data, int size) const; + // Like SerializeToArray(), but allows missing required fields. + bool SerializePartialToArray(void* data, int size) const; + + // Make a string encoding the message. Is equivalent to calling + // SerializeToString() on a string and using that. Returns the empty + // string if SerializeToString() would have returned an error. + // Note: If you intend to generate many such strings, you may + // reduce heap fragmentation by instead re-using the same string + // object with calls to SerializeToString(). + string SerializeAsString() const; + // Like SerializeAsString(), but allows missing required fields. + string SerializePartialAsString() const; + + // Like SerializeToString(), but appends to the data to the string's existing + // contents. All required fields must be set. + bool AppendToString(string* output) const; + // Like AppendToString(), but allows missing required fields. + bool AppendPartialToString(string* output) const; + + // Computes the serialized size of the message. This recursively calls + // ByteSize() on all embedded messages. If a subclass does not override + // this, it MUST override SetCachedSize(). + virtual int ByteSize() const = 0; + + // Serializes the message without recomputing the size. The message must + // not have changed since the last call to ByteSize(); if it has, the results + // are undefined. + virtual void SerializeWithCachedSizes( + io::CodedOutputStream* output) const = 0; + + // Like SerializeWithCachedSizes, but writes directly to *target, returning + // a pointer to the byte immediately after the last byte written. "target" + // must point at a byte array of at least ByteSize() bytes. + virtual uint8* SerializeWithCachedSizesToArray(uint8* target) const; + + // Returns the result of the last call to ByteSize(). An embedded message's + // size is needed both to serialize it (because embedded messages are + // length-delimited) and to compute the outer message's size. Caching + // the size avoids computing it multiple times. + // + // ByteSize() does not automatically use the cached size when available + // because this would require invalidating it every time the message was + // modified, which would be too hard and expensive. (E.g. if a deeply-nested + // sub-message is changed, all of its parents' cached sizes would need to be + // invalidated, which is too much work for an otherwise inlined setter + // method.) + virtual int GetCachedSize() const = 0; + + private: + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageLite); +}; + +} // namespace protobuf + +} // namespace google +#endif // GOOGLE_PROTOBUF_MESSAGE_LITE_H__ -- cgit v1.2.3