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// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.
// http://code.google.com/p/protobuf/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Author: kenton@google.com (Kenton Varda)
// Based on original Protocol Buffers design by
// Sanjay Ghemawat, Jeff Dean, and others.
#ifndef GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
#define GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
#include <google/protobuf/stubs/common.h>
#include <google/protobuf/descriptor.h>
namespace google {
namespace protobuf {
namespace io {
class Printer; // printer.h
}
}
namespace protobuf {
namespace compiler {
namespace cpp {
class FieldGenerator {
public:
FieldGenerator() {}
virtual ~FieldGenerator();
// Generate lines of code declaring members fields of the message class
// needed to represent this field. These are placed inside the message
// class.
virtual void GeneratePrivateMembers(io::Printer* printer) const = 0;
// Generate prototypes for all of the accessor functions related to this
// field. These are placed inside the class definition.
virtual void GenerateAccessorDeclarations(io::Printer* printer) const = 0;
// Generate inline definitions of accessor functions for this field.
// These are placed inside the header after all class definitions.
virtual void GenerateInlineAccessorDefinitions(
io::Printer* printer) const = 0;
// Generate definitions of accessors that aren't inlined. These are
// placed somewhere in the .cc file.
// Most field types don't need this, so the default implementation is empty.
virtual void GenerateNonInlineAccessorDefinitions(
io::Printer* printer) const {}
// Generate lines of code (statements, not declarations) which clear the
// field. This is used to define the clear_$name$() method as well as
// the Clear() method for the whole message.
virtual void GenerateClearingCode(io::Printer* printer) const = 0;
// Generate lines of code (statements, not declarations) which merges the
// contents of the field from the current message to the target message,
// which is stored in the generated code variable "from".
// This is used to fill in the MergeFrom method for the whole message.
// Details of this usage can be found in message.cc under the
// GenerateMergeFrom method.
virtual void GenerateMergingCode(io::Printer* printer) const = 0;
// Generate any initializers needed for the private members declared by
// GeneratePrivateMembers(). These go into the message class's
// constructor's initializer list. For each initializer, this method
// must print the comma and newline separating it from the *previous*
// initializer, not the *next* initailizer. That is, print a ",\n" first,
// e.g.:
// printer->Print(",\n$name$_($default$)");
virtual void GenerateInitializer(io::Printer* printer) const = 0;
// Generate any code that needs to go in the class's destructor.
// Most field types don't need this, so the default implementation is empty.
virtual void GenerateDestructorCode(io::Printer* printer) const {}
// Generate lines to decode this field, which will be placed inside the
// message's MergeFromCodedStream() method.
virtual void GenerateMergeFromCodedStream(io::Printer* printer) const = 0;
// Generate lines to serialize this field, which are placed within the
// message's SerializeWithCachedSizes() method.
virtual void GenerateSerializeWithCachedSizes(io::Printer* printer) const = 0;
// Generate lines to compute the serialized size of this field, which
// are placed in the message's ByteSize() method.
virtual void GenerateByteSize(io::Printer* printer) const = 0;
private:
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGenerator);
};
// Convenience class which constructs FieldGenerators for a Descriptor.
class FieldGeneratorMap {
public:
explicit FieldGeneratorMap(const Descriptor* descriptor);
~FieldGeneratorMap();
const FieldGenerator& get(const FieldDescriptor* field) const;
private:
const Descriptor* descriptor_;
scoped_array<scoped_ptr<FieldGenerator> > field_generators_;
static FieldGenerator* MakeGenerator(const FieldDescriptor* field);
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(FieldGeneratorMap);
};
} // namespace cpp
} // namespace compiler
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_COMPILER_CPP_FIELD_H__
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