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199 lines
7.8 KiB
C++
199 lines
7.8 KiB
C++
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: xiaofeng@google.com (Feng Xiao)
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#include <thirdparty/protobuf/compiler/java/shared_code_generator.h>
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#include <memory>
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#include <thirdparty/protobuf/compiler/code_generator.h>
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#include <thirdparty/protobuf/io/printer.h>
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#include <thirdparty/protobuf/io/zero_copy_stream.h>
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#include <thirdparty/protobuf/descriptor.h>
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#include <thirdparty/protobuf/stubs/strutil.h>
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#include <thirdparty/protobuf/compiler/java/helpers.h>
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#include <thirdparty/protobuf/compiler/java/name_resolver.h>
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#include <thirdparty/protobuf/compiler/java/names.h>
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#include <thirdparty/protobuf/descriptor.pb.h>
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namespace google {
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namespace protobuf {
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namespace compiler {
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namespace java {
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SharedCodeGenerator::SharedCodeGenerator(const FileDescriptor* file,
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const Options& options)
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: name_resolver_(new ClassNameResolver), file_(file), options_(options) {}
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SharedCodeGenerator::~SharedCodeGenerator() {}
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void SharedCodeGenerator::Generate(
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GeneratorContext* context, std::vector<std::string>* file_list,
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std::vector<std::string>* annotation_file_list) {
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std::string java_package = FileJavaPackage(file_);
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std::string package_dir = JavaPackageToDir(java_package);
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if (HasDescriptorMethods(file_, options_.enforce_lite)) {
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// Generate descriptors.
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std::string classname = name_resolver_->GetDescriptorClassName(file_);
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std::string filename = package_dir + classname + ".java";
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file_list->push_back(filename);
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std::unique_ptr<io::ZeroCopyOutputStream> output(context->Open(filename));
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GeneratedCodeInfo annotations;
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io::AnnotationProtoCollector<GeneratedCodeInfo> annotation_collector(
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&annotations);
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std::unique_ptr<io::Printer> printer(
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new io::Printer(output.get(), '$',
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options_.annotate_code ? &annotation_collector : NULL));
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std::string info_relative_path = classname + ".java.pb.meta";
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std::string info_full_path = filename + ".pb.meta";
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printer->Print(
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"// Generated by the protocol buffer compiler. DO NOT EDIT!\n"
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"// source: $filename$\n"
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"\n",
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"filename", file_->name());
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if (!java_package.empty()) {
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printer->Print(
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"package $package$;\n"
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"\n",
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"package", java_package);
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}
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PrintGeneratedAnnotation(printer.get(), '$',
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options_.annotate_code ? info_relative_path : "");
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printer->Print(
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"public final class $classname$ {\n"
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" public static com.google.protobuf.Descriptors.FileDescriptor\n"
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" descriptor;\n"
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" static {\n",
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"classname", classname);
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printer->Annotate("classname", file_->name());
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printer->Indent();
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printer->Indent();
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GenerateDescriptors(printer.get());
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printer->Outdent();
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printer->Outdent();
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printer->Print(
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" }\n"
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"}\n");
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if (options_.annotate_code) {
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std::unique_ptr<io::ZeroCopyOutputStream> info_output(
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context->Open(info_full_path));
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annotations.SerializeToZeroCopyStream(info_output.get());
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annotation_file_list->push_back(info_full_path);
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}
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printer.reset();
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output.reset();
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}
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}
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void SharedCodeGenerator::GenerateDescriptors(io::Printer* printer) {
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// Embed the descriptor. We simply serialize the entire FileDescriptorProto
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// and embed it as a string literal, which is parsed and built into real
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// descriptors at initialization time. We unfortunately have to put it in
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// a string literal, not a byte array, because apparently using a literal
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// byte array causes the Java compiler to generate *instructions* to
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// initialize each and every byte of the array, e.g. as if you typed:
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// b[0] = 123; b[1] = 456; b[2] = 789;
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// This makes huge bytecode files and can easily hit the compiler's internal
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// code size limits (error "code to large"). String literals are apparently
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// embedded raw, which is what we want.
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FileDescriptorProto file_proto;
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file_->CopyTo(&file_proto);
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std::string file_data;
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file_proto.SerializeToString(&file_data);
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printer->Print("java.lang.String[] descriptorData = {\n");
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printer->Indent();
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// Limit the number of bytes per line.
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static const int kBytesPerLine = 40;
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// Limit the number of lines per string part.
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static const int kLinesPerPart = 400;
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// Every block of bytes, start a new string literal, in order to avoid the
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// 64k length limit. Note that this value needs to be <64k.
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static const int kBytesPerPart = kBytesPerLine * kLinesPerPart;
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for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
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if (i > 0) {
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if (i % kBytesPerPart == 0) {
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printer->Print(",\n");
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} else {
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printer->Print(" +\n");
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}
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}
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printer->Print("\"$data$\"", "data",
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CEscape(file_data.substr(i, kBytesPerLine)));
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}
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printer->Outdent();
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printer->Print("\n};\n");
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// -----------------------------------------------------------------
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// Find out all dependencies.
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std::vector<std::pair<std::string, std::string> > dependencies;
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for (int i = 0; i < file_->dependency_count(); i++) {
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std::string filename = file_->dependency(i)->name();
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std::string package = FileJavaPackage(file_->dependency(i));
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std::string classname =
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name_resolver_->GetDescriptorClassName(file_->dependency(i));
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std::string full_name;
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if (package.empty()) {
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full_name = classname;
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} else {
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full_name = package + "." + classname;
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}
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dependencies.push_back(std::make_pair(filename, full_name));
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}
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// -----------------------------------------------------------------
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// Invoke internalBuildGeneratedFileFrom() to build the file.
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printer->Print(
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"descriptor = com.google.protobuf.Descriptors.FileDescriptor\n"
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" .internalBuildGeneratedFileFrom(descriptorData,\n");
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printer->Print(
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" new com.google.protobuf.Descriptors.FileDescriptor[] {\n");
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for (int i = 0; i < dependencies.size(); i++) {
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const std::string& dependency = dependencies[i].second;
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printer->Print(" $dependency$.getDescriptor(),\n", "dependency",
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dependency);
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}
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printer->Print(" });\n");
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}
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} // namespace java
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} // namespace compiler
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} // namespace protobuf
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} // namespace google
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