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Diffstat (limited to 'src/google/protobuf/compiler/java/java_shared_code_generator.cc')
| -rw-r--r-- | src/google/protobuf/compiler/java/java_shared_code_generator.cc | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/src/google/protobuf/compiler/java/java_shared_code_generator.cc b/src/google/protobuf/compiler/java/java_shared_code_generator.cc new file mode 100644 index 0000000..ea77f79 --- /dev/null +++ b/src/google/protobuf/compiler/java/java_shared_code_generator.cc @@ -0,0 +1,201 @@ +// 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. + +// Author: xiaofeng@google.com (Feng Xiao) + +#include <google/protobuf/compiler/java/java_shared_code_generator.h> + +#include <memory> + +#include <google/protobuf/compiler/java/java_helpers.h> +#include <google/protobuf/compiler/java/java_name_resolver.h> +#include <google/protobuf/compiler/code_generator.h> +#include <google/protobuf/io/printer.h> +#include <google/protobuf/io/zero_copy_stream.h> +#include <google/protobuf/descriptor.pb.h> +#include <google/protobuf/descriptor.h> +#include <google/protobuf/stubs/strutil.h> + +namespace google { +namespace protobuf { +namespace compiler { +namespace java { + +SharedCodeGenerator::SharedCodeGenerator(const FileDescriptor* file) + : name_resolver_(new ClassNameResolver), file_(file) { +} + +SharedCodeGenerator::~SharedCodeGenerator() { +} + +void SharedCodeGenerator::Generate(GeneratorContext* context, + vector<string>* file_list) { + string java_package = FileJavaPackage(file_); + string package_dir = JavaPackageToDir(java_package); + + if (HasDescriptorMethods(file_)) { + // Generate descriptors. + string classname = name_resolver_->GetDescriptorClassName(file_); + string filename = package_dir + classname + ".java"; + file_list->push_back(filename); + scoped_ptr<io::ZeroCopyOutputStream> output(context->Open(filename)); + scoped_ptr<io::Printer> printer(new io::Printer(output.get(), '$')); + + printer->Print( + "// Generated by the protocol buffer compiler. DO NOT EDIT!\n" + "// source: $filename$\n" + "\n", + "filename", file_->name()); + if (!java_package.empty()) { + printer->Print( + "package $package$;\n" + "\n", + "package", java_package); + } + printer->Print( + "public final class $classname$ {\n" + " public static com.google.protobuf.Descriptors.FileDescriptor\n" + " descriptor;\n" + " static {\n", + "classname", classname); + printer->Indent(); + printer->Indent(); + GenerateDescriptors(printer.get()); + printer->Outdent(); + printer->Outdent(); + printer->Print( + " }\n" + "}\n"); + + printer.reset(); + output.reset(); + } +} + + +void SharedCodeGenerator::GenerateDescriptors(io::Printer* printer) { + // Embed the descriptor. We simply serialize the entire FileDescriptorProto + // and embed it as a string literal, which is parsed and built into real + // descriptors at initialization time. We unfortunately have to put it in + // a string literal, not a byte array, because apparently using a literal + // byte array causes the Java compiler to generate *instructions* to + // initialize each and every byte of the array, e.g. as if you typed: + // b[0] = 123; b[1] = 456; b[2] = 789; + // This makes huge bytecode files and can easily hit the compiler's internal + // code size limits (error "code to large"). String literals are apparently + // embedded raw, which is what we want. + FileDescriptorProto file_proto; + file_->CopyTo(&file_proto); + + + string file_data; + file_proto.SerializeToString(&file_data); + + printer->Print( + "java.lang.String[] descriptorData = {\n"); + printer->Indent(); + + // Only write 40 bytes per line. + static const int kBytesPerLine = 40; + for (int i = 0; i < file_data.size(); i += kBytesPerLine) { + if (i > 0) { + // Every 400 lines, start a new string literal, in order to avoid the + // 64k length limit. + if (i % 400 == 0) { + printer->Print(",\n"); + } else { + printer->Print(" +\n"); + } + } + printer->Print("\"$data$\"", + "data", CEscape(file_data.substr(i, kBytesPerLine))); + } + + printer->Outdent(); + printer->Print("\n};\n"); + + // ----------------------------------------------------------------- + // Create the InternalDescriptorAssigner. + + printer->Print( + "com.google.protobuf.Descriptors.FileDescriptor." + "InternalDescriptorAssigner assigner =\n" + " new com.google.protobuf.Descriptors.FileDescriptor." + " InternalDescriptorAssigner() {\n" + " public com.google.protobuf.ExtensionRegistry assignDescriptors(\n" + " com.google.protobuf.Descriptors.FileDescriptor root) {\n" + " descriptor = root;\n" + // Custom options will be handled when immutable messages' outer class is + // loaded. Here we just return null and let custom options be unknown + // fields. + " return null;\n" + " }\n" + " };\n"); + + // ----------------------------------------------------------------- + // Find out all dependencies. + vector<pair<string, string> > dependencies; + for (int i = 0; i < file_->dependency_count(); i++) { + if (ShouldIncludeDependency(file_->dependency(i))) { + string filename = file_->dependency(i)->name(); + string classname = FileJavaPackage(file_->dependency(i)) + "." + + name_resolver_->GetDescriptorClassName( + file_->dependency(i)); + dependencies.push_back(make_pair(filename, classname)); + } + } + + // ----------------------------------------------------------------- + // Invoke internalBuildGeneratedFileFrom() to build the file. + printer->Print( + "com.google.protobuf.Descriptors.FileDescriptor\n" + " .internalBuildGeneratedFileFrom(descriptorData,\n" + " new com.google.protobuf.Descriptors.FileDescriptor[] {\n"); + + for (int i = 0; i < dependencies.size(); i++) { + const string& dependency = dependencies[i].second; + printer->Print( + " $dependency$.getDescriptor(),\n", + "dependency", dependency); + } + + printer->Print( + " }, assigner);\n"); +} + +bool SharedCodeGenerator::ShouldIncludeDependency( + const FileDescriptor* descriptor) { + return true; +} + +} // namespace java +} // namespace compiler +} // namespace protobuf +} // namespace google |