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+// 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.
+
+#ifndef GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_WRITER_H__
+#define GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_WRITER_H__
+
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/stubs/stringpiece.h>
+
+namespace google {
+namespace protobuf {
+namespace util {
+namespace converter {
+
+class DataPiece;
+
+// An ObjectWriter is an interface for writing a stream of events
+// representing objects and collections. Implementation of this
+// interface can be used to write an object stream to an in-memory
+// structure, protobufs, JSON, XML, or any other output format
+// desired. The ObjectSource interface is typically used as the
+// source of an object stream.
+//
+// See JsonObjectWriter for a sample implementation of ObjectWriter
+// and its use.
+//
+// Derived classes could be thread-unsafe.
+//
+// TODO(xinb): seems like a prime candidate to apply the RAII paradigm
+// and get rid the need to call EndXXX().
+class LIBPROTOBUF_EXPORT ObjectWriter {
+ public:
+  virtual ~ObjectWriter() {}
+
+  // Starts an object. If the name is empty, the object will not be named.
+  virtual ObjectWriter* StartObject(StringPiece name) = 0;
+
+  // Ends an object.
+  virtual ObjectWriter* EndObject() = 0;
+
+  // Starts a list. If the name is empty, the list will not be named.
+  virtual ObjectWriter* StartList(StringPiece name) = 0;
+
+  // Ends a list.
+  virtual ObjectWriter* EndList() = 0;
+
+  // Renders a boolean value.
+  virtual ObjectWriter* RenderBool(StringPiece name, bool value) = 0;
+
+  // Renders an 32-bit integer value.
+  virtual ObjectWriter* RenderInt32(StringPiece name, int32 value) = 0;
+
+  // Renders an 32-bit unsigned integer value.
+  virtual ObjectWriter* RenderUint32(StringPiece name, uint32 value) = 0;
+
+  // Renders a 64-bit integer value.
+  virtual ObjectWriter* RenderInt64(StringPiece name, int64 value) = 0;
+
+  // Renders an 64-bit unsigned integer value.
+  virtual ObjectWriter* RenderUint64(StringPiece name, uint64 value) = 0;
+
+  // Renders a double value.
+  virtual ObjectWriter* RenderDouble(StringPiece name, double value) = 0;
+
+  // Renders a float value.
+  virtual ObjectWriter* RenderFloat(StringPiece name, float value) = 0;
+
+  // Renders a StringPiece value. This is for rendering strings.
+  virtual ObjectWriter* RenderString(StringPiece name, StringPiece value) = 0;
+
+  // Renders a bytes value.
+  virtual ObjectWriter* RenderBytes(StringPiece name, StringPiece value) = 0;
+
+  // Renders a Null value.
+  virtual ObjectWriter* RenderNull(StringPiece name) = 0;
+
+
+  // Renders a DataPiece object to a ObjectWriter.
+  static void RenderDataPieceTo(const DataPiece& data, StringPiece name,
+                                ObjectWriter* ow);
+
+  // Indicates whether this ObjectWriter has completed writing the root message,
+  // usually this means writing of one complete object. Subclasses must override
+  // this behavior appropriately.
+  virtual bool done() { return false; }
+
+  void set_use_strict_base64_decoding(bool value) {
+    use_strict_base64_decoding_ = value;
+  }
+
+  bool use_strict_base64_decoding() const {
+    return use_strict_base64_decoding_;
+  }
+
+  // Whether empty strings should be rendered for the next name for Start/Render
+  // calls. This setting is only valid until the next key is rendered, after
+  // which it gets reset.
+  // It is up to the derived classes to interpret this and render accordingly.
+  // Default implementation ignores this setting.
+  virtual void empty_name_ok_for_next_key() {}
+
+ protected:
+  ObjectWriter() : use_strict_base64_decoding_(true) {}
+
+ private:
+  // If set to true, we use the stricter version of base64 decoding for byte
+  // fields by making sure decoded version encodes back to the original string.
+  bool use_strict_base64_decoding_;
+
+  // Do not add any data members to this class.
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ObjectWriter);
+};
+
+}  // namespace converter
+}  // namespace util
+}  // namespace protobuf
+
+}  // namespace google
+#endif  // GOOGLE_PROTOBUF_UTIL_CONVERTER_OBJECT_WRITER_H__