Page Speed Optimization Libraries  1.4.26.1
net/instaweb/util/public/json_writer.h
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00001 /*
00002  * Copyright 2011 Google Inc.
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *      http:///www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00018 
00019 #ifndef NET_INSTAWEB_UTIL_PUBLIC_JSON_WRITER_H_
00020 #define NET_INSTAWEB_UTIL_PUBLIC_JSON_WRITER_H_
00021 
00022 #include <utility>
00023 #include <vector>
00024 
00025 #include "net/instaweb/util/public/basictypes.h"
00026 #include "net/instaweb/util/public/string.h"
00027 #include "net/instaweb/util/public/string_util.h"
00028 #include "net/instaweb/util/public/writer.h"
00029 
00030 namespace Json {
00031 class Value;
00032 }  
00033 
00034 namespace net_instaweb {
00035 
00036 static const char kInstanceHtml[] = "instance_html";
00037 
00038 class HtmlElement;
00039 class MessageHandler;
00040 
00042 typedef std::pair<HtmlElement*, Json::Value*> ElementJsonPair;
00043 
00045 class JsonWriter : public Writer {
00046  public:
00049   JsonWriter(Writer* writer,
00050              const std::vector<ElementJsonPair>* element_json_stack);
00051   virtual ~JsonWriter();
00052 
00053   virtual bool Write(const StringPiece& str, MessageHandler* message_handler);
00054   virtual bool Flush(MessageHandler* message_handler);
00056   void UpdateDictionary();
00057 
00058  private:
00059   Writer* writer_;
00060   GoogleString buffer_;
00061   const std::vector<ElementJsonPair>* element_json_stack_;
00062 
00063   DISALLOW_COPY_AND_ASSIGN(JsonWriter);
00064 };
00065 
00066 }  
00067 
00068 #endif  ///< NET_INSTAWEB_UTIL_PUBLIC_JSON_WRITER_H_
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