00001 /* 00002 * The Apache Software License, Version 1.1 00003 * 00004 * 00005 * Copyright (c) 1999 The Apache Software Foundation. All rights 00006 * reserved. 00007 * 00008 * Redistribution and use in source and binary forms, with or without 00009 * modification, are permitted provided that the following conditions 00010 * are met: 00011 * 00012 * 1. Redistributions of source code must retain the above copyright 00013 * notice, this list of conditions and the following disclaimer. 00014 * 00015 * 2. Redistributions in binary form must reproduce the above copyright 00016 * notice, this list of conditions and the following disclaimer in 00017 * the documentation and/or other materials provided with the 00018 * distribution. 00019 * 00020 * 3. The end-user documentation included with the redistribution, 00021 * if any, must include the following acknowledgment: 00022 * "This product includes software developed by the 00023 * Apache Software Foundation (http://www.apache.org/)." 00024 * Alternately, this acknowledgment may appear in the software itself, 00025 * if and wherever such third-party acknowledgments normally appear. 00026 * 00027 * 4. The names "Xalan" and "Apache Software Foundation" must 00028 * not be used to endorse or promote products derived from this 00029 * software without prior written permission. For written 00030 * permission, please contact apache@apache.org. 00031 * 00032 * 5. Products derived from this software may not be called "Apache", 00033 * nor may "Apache" appear in their name, without prior written 00034 * permission of the Apache Software Foundation. 00035 * 00036 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 00037 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 00038 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00039 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 00040 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00041 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00042 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 00043 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 00044 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00045 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 00046 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00047 * SUCH DAMAGE. 00048 * ==================================================================== 00049 * 00050 * This software consists of voluntary contributions made by many 00051 * individuals on behalf of the Apache Software Foundation and was 00052 * originally based on software copyright (c) 1999, International 00053 * Business Machines, Inc., http://www.ibm.com. For more 00054 * information on the Apache Software Foundation, please see 00055 * <http://www.apache.org/>. 00056 */ 00057 #if !defined(XPATHFACTORY_HEADER_GUARD_1357924680) 00058 #define XPATHFACTORY_HEADER_GUARD_1357924680 00059 00060 00061 00062 // Base include file. Must be first. 00063 #include <XPath/XPathDefinitions.hpp> 00064 00065 00066 00067 #include <cassert> 00068 #include <functional> 00069 00070 00071 00072 class XPath; 00073 00074 00075 00076 class XALAN_XPATH_EXPORT XPathFactory 00077 { 00078 public: 00079 00080 explicit 00081 XPathFactory(); 00082 00083 virtual 00084 ~XPathFactory(); 00085 00092 bool 00093 returnObject(const XPath* theXPath) 00094 { 00095 return doReturnObject(theXPath); 00096 } 00097 00102 virtual void 00103 reset() = 0; 00104 00110 virtual XPath* 00111 create() = 0; 00112 00118 #if defined(XALAN_NO_NAMESPACES) 00119 struct DeleteXPathFunctor : public unary_function<const XPath*, void> 00120 #else 00121 struct DeleteXPathFunctor : public std::unary_function<const XPath*, void> 00122 #endif 00123 { 00124 public: 00125 00126 DeleteXPathFunctor( 00127 XPathFactory& theFactoryInstance, 00128 bool fInReset = false) : 00129 m_factoryInstance(theFactoryInstance), 00130 m_fInReset(fInReset) 00131 { 00132 } 00133 00134 result_type 00135 operator()(argument_type theXPath) const 00136 { 00137 if (m_fInReset == true) 00138 { 00139 m_factoryInstance.doReturnObject(theXPath, 00140 true); 00141 } 00142 else 00143 { 00144 m_factoryInstance.returnObject(theXPath); 00145 } 00146 } 00147 00148 private: 00149 00150 XPathFactory& m_factoryInstance; 00151 00152 const bool m_fInReset; 00153 }; 00154 00155 friend struct DeleteXPathFunctor; 00156 00157 protected: 00158 00159 virtual bool 00160 doReturnObject( 00161 const XPath* theXPath, 00162 bool fInReset = false) = 0; 00163 }; 00164 00165 00166 00170 class XPathGuard 00171 { 00172 public: 00173 00180 XPathGuard( 00181 XPathFactory& theFactory, 00182 const XPath* theXPath) : 00183 m_factory(&theFactory), 00184 m_object(theXPath) 00185 { 00186 } 00187 00188 // Note that copy construction transfers ownership, just 00189 // as std::auto_ptr. 00190 XPathGuard(XPathGuard& theRHS) 00191 { 00192 // Release the current object... 00193 release(); 00194 00195 // Copy the factory and object pointers... 00196 m_factory = theRHS.m_factory; 00197 m_object = theRHS.m_object; 00198 00199 // The source object no longer points to 00200 // the object... 00201 theRHS.m_factory = 0; 00202 theRHS.m_object = 0; 00203 } 00204 00205 ~XPathGuard() 00206 { 00207 reset(); 00208 } 00209 00215 const XPath* 00216 operator->() const 00217 { 00218 assert(m_object != 0); 00219 00220 return m_object; 00221 } 00222 00228 const XPath* 00229 get() const 00230 { 00231 return m_object; 00232 } 00233 00237 void 00238 reset() 00239 { 00240 if (m_object != 0) 00241 { 00242 assert(m_factory != 0); 00243 00244 m_factory->returnObject(m_object); 00245 00246 m_object = 0; 00247 } 00248 00249 m_factory = 0; 00250 } 00251 00257 const XPath* 00258 release() 00259 { 00260 const XPath* const theTemp = m_object; 00261 00262 m_object = 0; 00263 00264 return theTemp; 00265 } 00266 00267 private: 00268 00269 XPathGuard& 00270 operator=(const XPathGuard&); 00271 00272 bool 00273 operator==(const XPathGuard&) const; 00274 00275 00276 // Data members... 00277 XPathFactory* m_factory; 00278 const XPath* m_object; 00279 }; 00280 00281 #endif // XPATHFACTORY_HEADER_GUARD_1357924680
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