Page Speed Optimization Libraries
1.2.24.1
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00001 /* 00002 * Copyright 2010 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_HTTP_PUBLIC_HTTP_VALUE_H_ 00020 #define NET_INSTAWEB_HTTP_PUBLIC_HTTP_VALUE_H_ 00021 00022 #include <cstddef> 00023 #include "net/instaweb/util/public/basictypes.h" 00024 #include "net/instaweb/util/public/shared_string.h" 00025 #include "net/instaweb/util/public/string_util.h" 00026 #include "net/instaweb/util/public/writer.h" 00027 00028 namespace net_instaweb { 00029 00030 class ResponseHeaders; 00031 class MessageHandler; 00032 00036 class HTTPValue : public Writer { 00037 public: 00038 HTTPValue() : contents_size_(0) {} 00039 00041 void Clear(); 00042 00044 bool Empty() const { return storage_.empty(); } 00045 00054 void SetHeaders(ResponseHeaders* headers); 00055 00060 virtual bool Write(const StringPiece& str, MessageHandler* handler); 00061 virtual bool Flush(MessageHandler* handler); 00062 00064 bool ExtractHeaders(ResponseHeaders* headers, MessageHandler* handler) const; 00065 00069 bool ExtractContents(StringPiece* str) const; 00070 00072 bool unique() const { return storage_.unique(); } 00073 00079 bool Link(SharedString* src, ResponseHeaders* headers, 00080 MessageHandler* handler); 00081 00084 void Link(HTTPValue* src) { 00085 if (src != this) { 00086 storage_ = src->storage_; 00087 contents_size_ = src->contents_size(); 00088 } 00089 } 00090 00092 SharedString* share() { return &storage_; } 00093 00094 size_t size() const { return storage_.size(); } 00095 int64 contents_size() { return contents_size_; } 00096 00097 private: 00098 friend class HTTPValueTest; 00099 00101 char type_identifier() const { return *storage_.data(); } 00102 00103 unsigned int SizeOfFirstChunk() const; 00104 void SetSizeOfFirstChunk(unsigned int size); 00105 int64 ComputeContentsSize() const; 00106 00109 void CopyOnWrite(); 00110 00111 SharedString storage_; 00113 int64 contents_size_; 00114 00115 DISALLOW_COPY_AND_ASSIGN(HTTPValue); 00116 }; 00117 00118 } 00119 00120 #endif ///< NET_INSTAWEB_HTTP_PUBLIC_HTTP_VALUE_H_