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+// 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.
+
+#ifndef GOOGLE_PROTOBUF_COMPILER_JAVA_NAME_RESOLVER_H__
+#define GOOGLE_PROTOBUF_COMPILER_JAVA_NAME_RESOLVER_H__
+
+#include <map>
+#include <string>
+
+#include <google/protobuf/stubs/common.h>
+
+namespace google {
+namespace protobuf {
+class Descriptor;
+class EnumDescriptor;
+class FieldDescriptor;
+class FileDescriptor;
+class ServiceDescriptor;
+
+namespace compiler {
+namespace java {
+
+// Used to get the Java class related names for a given descriptor. It caches
+// the results to avoid redundant calculation across multiple name queries.
+// Thread-safety note: This class is *not* thread-safe.
+class ClassNameResolver {
+ public:
+  ClassNameResolver();
+  ~ClassNameResolver();
+
+  // Gets the unqualified outer class name for the file.
+  string GetFileClassName(const FileDescriptor* file, bool immutable);
+  // Gets the unqualified immutable outer class name of a file.
+  string GetFileImmutableClassName(const FileDescriptor* file);
+  // Gets the unqualified default immutable outer class name of a file
+  // (converted from the proto file's name).
+  string GetFileDefaultImmutableClassName(const FileDescriptor* file);
+
+  // Check whether there is any type defined in the proto file that has
+  // the given class name.
+  bool HasConflictingClassName(const FileDescriptor* file,
+                               const string& classname);
+
+  // Gets the name of the outer class that holds descriptor information.
+  // Descriptors are shared between immutable messages and mutable messages.
+  // Since both of them are generated optionally, the descriptors need to be
+  // put in another common place.
+  string GetDescriptorClassName(const FileDescriptor* file);
+
+  // Gets the fully-qualified class name corresponding to the given descriptor.
+  string GetClassName(const Descriptor* descriptor, bool immutable);
+  string GetClassName(const EnumDescriptor* descriptor, bool immutable);
+  string GetClassName(const ServiceDescriptor* descriptor, bool immutable);
+  string GetClassName(const FileDescriptor* descriptor, bool immutable);
+
+  template<class DescriptorType>
+  string GetImmutableClassName(const DescriptorType* descriptor) {
+    return GetClassName(descriptor, true);
+  }
+  template<class DescriptorType>
+  string GetMutableClassName(const DescriptorType* descriptor) {
+    return GetClassName(descriptor, false);
+  }
+
+  // Gets the fully qualified name of an extension identifier.
+  string GetExtensionIdentifierName(const FieldDescriptor* descriptor,
+                                    bool immutable);
+
+  // Gets the fully qualified name for generated classes in Java convention.
+  // Nested classes will be separated using '$' instead of '.'
+  // For example:
+  //   com.package.OuterClass$OuterMessage$InnerMessage
+  string GetJavaImmutableClassName(const Descriptor* descriptor);
+ private:
+  // Get the full name of a Java class by prepending the Java package name
+  // or outer class name.
+  string GetClassFullName(const string& name_without_package,
+                          const FileDescriptor* file,
+                          bool immutable,
+                          bool multiple_files);
+  // Get the Java Class style full name of a message.
+  string GetJavaClassFullName(
+      const string& name_without_package,
+      const FileDescriptor* file,
+      bool immutable);
+  // Caches the result to provide better performance.
+  map<const FileDescriptor*, string> file_immutable_outer_class_names_;
+
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ClassNameResolver);
+};
+
+}  // namespace java
+}  // namespace compiler
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_COMPILER_JAVA_NAME_RESOLVER_H__