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 00111 virtual XPath* 00112 create(bool fOptimize = true) = 0; 00113 00119 #if defined(XALAN_NO_NAMESPACES) 00120 struct DeleteXPathFunctor : public unary_function<const XPath*, void> 00121 #else 00122 struct DeleteXPathFunctor : public std::unary_function<const XPath*, void> 00123 #endif 00124 { 00125 public: 00126 00127 DeleteXPathFunctor( 00128 XPathFactory& theFactoryInstance, 00129 bool fInReset = false) : 00130 m_factoryInstance(theFactoryInstance), 00131 m_fInReset(fInReset) 00132 { 00133 } 00134 00135 result_type 00136 operator()(argument_type theXPath) const 00137 { 00138 if (m_fInReset == true) 00139 { 00140 m_factoryInstance.doReturnObject(theXPath, 00141 true); 00142 } 00143 else 00144 { 00145 m_factoryInstance.returnObject(theXPath); 00146 } 00147 } 00148 00149 private: 00150 00151 XPathFactory& m_factoryInstance; 00152 00153 const bool m_fInReset; 00154 }; 00155 00156 friend struct DeleteXPathFunctor; 00157 00158 protected: 00159 00160 virtual bool 00161 doReturnObject( 00162 const XPath* theXPath, 00163 bool fInReset = false) = 0; 00164 }; 00165 00166 00167 00171 class XPathGuard 00172 { 00173 public: 00174 00181 XPathGuard( 00182 XPathFactory& theFactory, 00183 const XPath* theXPath) : 00184 m_factory(&theFactory), 00185 m_object(theXPath) 00186 { 00187 } 00188 00189 // Note that copy construction transfers ownership, just 00190 // as std::auto_ptr. 00191 XPathGuard(XPathGuard& theRHS) 00192 { 00193 // Release the current object... 00194 release(); 00195 00196 // Copy the factory and object pointers... 00197 m_factory = theRHS.m_factory; 00198 m_object = theRHS.m_object; 00199 00200 // The source object no longer points to 00201 // the object... 00202 theRHS.m_factory = 0; 00203 theRHS.m_object = 0; 00204 } 00205 00206 ~XPathGuard() 00207 { 00208 reset(); 00209 } 00210 00216 const XPath* 00217 operator->() const 00218 { 00219 assert(m_object != 0); 00220 00221 return m_object; 00222 } 00223 00229 const XPath* 00230 get() const 00231 { 00232 return m_object; 00233 } 00234 00238 void 00239 reset() 00240 { 00241 if (m_object != 0) 00242 { 00243 assert(m_factory != 0); 00244 00245 m_factory->returnObject(m_object); 00246 00247 m_object = 0; 00248 } 00249 00250 m_factory = 0; 00251 } 00252 00258 const XPath* 00259 release() 00260 { 00261 const XPath* const theTemp = m_object; 00262 00263 m_object = 0; 00264 00265 return theTemp; 00266 } 00267 00268 private: 00269 00270 XPathGuard& 00271 operator=(const XPathGuard&); 00272 00273 bool 00274 operator==(const XPathGuard&) const; 00275 00276 00277 // Data members... 00278 XPathFactory* m_factory; 00279 const XPath* m_object; 00280 }; 00281 00282 #endif // XPATHFACTORY_HEADER_GUARD_1357924680
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