00001 /* 00002 * Copyright 1999-2004 The Apache Software Foundation. 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 #if !defined(XALAN_DOMSTRINGCACHE_HEADER_GUARD) 00017 #define XALAN_DOMSTRINGCACHE_HEADER_GUARD 00018 00019 00020 00021 // Base include file. Must be first. 00022 #include <xalanc/PlatformSupport/PlatformSupportDefinitions.hpp> 00023 00024 00025 00026 #include <xalanc/Include/XalanVector.hpp> 00027 00028 00029 00030 #include <xalanc/XalanDOM/XalanDOMString.hpp> 00031 00032 00033 00034 #include <xalanc/PlatformSupport/XalanDOMStringReusableAllocator.hpp> 00035 00036 00037 00038 XALAN_CPP_NAMESPACE_BEGIN 00039 00040 00041 00042 class XALAN_PLATFORMSUPPORT_EXPORT XalanDOMStringCache 00043 { 00044 public: 00045 00046 enum { eDefaultMaximumSize = 100 }; 00047 00048 typedef XalanVector<XalanDOMString*> StringListType; 00049 00050 explicit 00051 XalanDOMStringCache(MemoryManagerType& theManager, 00052 unsigned int theMaximumSize = eDefaultMaximumSize); 00053 00054 ~XalanDOMStringCache(); 00055 00056 unsigned int 00057 getMaximumSize() const 00058 { 00059 return m_maximumSize; 00060 } 00061 00062 void 00063 setMaximumSize(unsigned int theSize) 00064 { 00065 m_maximumSize = theSize; 00066 } 00067 00068 XalanDOMString& 00069 get(); 00070 00071 bool 00072 release(XalanDOMString& theString); 00073 00074 /* 00075 * Clear all of the strings in the cache. This 00076 * destroys all of the strings. 00077 * 00078 */ 00079 void 00080 clear(); 00081 00082 /* 00083 * Reset the cache so that all strings that are 00084 * currently in use are available. 00085 */ 00086 void 00087 reset(); 00088 00089 class GetAndRelease 00090 { 00091 public: 00092 00093 GetAndRelease(XalanDOMStringCache& theCache) : 00094 m_cache(theCache), 00095 m_string(&theCache.get()) 00096 { 00097 } 00098 00099 ~GetAndRelease() 00100 { 00101 m_cache.release(*m_string); 00102 } 00103 00104 XalanDOMString& 00105 get() const 00106 { 00107 return *m_string; 00108 } 00109 00110 private: 00111 00112 XalanDOMStringCache& m_cache; 00113 00114 XalanDOMString* const m_string; 00115 }; 00116 00117 private: 00118 00119 // not implemented 00120 XalanDOMStringCache(const XalanDOMStringCache&); 00121 00122 bool 00123 operator==(const XalanDOMStringCache&) const; 00124 00125 XalanDOMStringCache& 00126 operator=(const XalanDOMStringCache&); 00127 00131 StringListType m_availableList; 00132 00136 StringListType m_busyList; 00137 00138 unsigned int m_maximumSize; 00139 00140 XalanDOMStringReusableAllocator m_allocator; 00141 }; 00142 00143 00144 00145 XALAN_CPP_NAMESPACE_END 00146 00147 00148 00149 #endif // XALAN_RESULTNAMESPACESSTACK_HEADER_GUARD
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