## Xalan-C++ API Documentation

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# XPathFactory.hpp

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    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(XPATHFACTORY_HEADER_GUARD_1357924680)
    00017 #define XPATHFACTORY_HEADER_GUARD_1357924680
    00018
    00019
    00020
    00021 // Base include file.  Must be first.
    00022 #include <xalanc/XPath/XPathDefinitions.hpp>
    00023
    00024 #include <xalanc/Include/XalanMemoryManagement.hpp>
    00025
    00026 #include <cassert>
    00027 #include <functional>
    00028
    00029
    00030
    00031 XALAN_CPP_NAMESPACE_BEGIN
    00032
    00033
    00034
    00035 class XPath;
    00036
    00037
    00038
    00039 class XALAN_XPATH_EXPORT XPathFactory
    00040 {
    00041 public:
    00042
    00043     explicit
    00044     XPathFactory();
    00045
    00046     virtual
    00047     ~XPathFactory();
    00048
    00055     bool
    00056     returnObject(const XPath*   theXPath)
    00057     {
    00058         return doReturnObject(theXPath);
    00059     }
    00060
    00065     virtual void
    00066     reset() = 0;
    00067
    00073     virtual XPath*
    00074     create() = 0;
    00075
    00081 #if defined(XALAN_NO_STD_NAMESPACE)
    00082     struct DeleteXPathFunctor : public unary_function<const XPath*, void>
    00083 #else
    00084     struct DeleteXPathFunctor : public std::unary_function<const XPath*, void>
    00085 #endif
    00086     {
    00087     public:
    00088
    00089         DeleteXPathFunctor(
    00090             XPathFactory&       theFactoryInstance,
    00091             bool                fInReset = false) :
    00092             m_factoryInstance(theFactoryInstance),
    00093             m_fInReset(fInReset)
    00094         {
    00095         }
    00096
    00097         result_type
    00098         operator()(argument_type    theXPath) const
    00099         {
    00100             if (m_fInReset == true)
    00101             {
    00102                 m_factoryInstance.doReturnObject(theXPath,
    00103                                                  true);
    00104             }
    00105             else
    00106             {
    00107                 m_factoryInstance.returnObject(theXPath);
    00108             }
    00109         }
    00110
    00111     private:
    00112
    00113         XPathFactory&       m_factoryInstance;
    00114
    00115         const bool          m_fInReset;
    00116     };
    00117
    00118     friend struct DeleteXPathFunctor;
    00119
    00120 protected:
    00121
    00122     virtual bool
    00123     doReturnObject(
    00124             const XPath*    theXPath,
    00125             bool            fInReset = false) = 0;
    00126 };
    00127
    00128
    00129
    00133 class XPathGuard
    00134 {
    00135 public:
    00136
    00143     XPathGuard(
    00144             XPathFactory&   theFactory,
    00145             const XPath*    theXPath) :
    00146         m_factory(&theFactory),
    00147         m_object(theXPath)
    00148     {
    00149     }
    00150
    00151     // Note that copy construction transfers ownership, just
    00152     // as std::auto_ptr.
    00153     XPathGuard(XPathGuard&  theRHS)
    00154     {
    00155         // Release the current object...
    00156         release();
    00157
    00158         // Copy the factory and object pointers...
    00159         m_factory = theRHS.m_factory;
    00160         m_object = theRHS.m_object;
    00161
    00162         // The source object no longer points to
    00163         // the object...
    00164         theRHS.m_factory = 0;
    00165         theRHS.m_object = 0;
    00166     }
    00167
    00168     ~XPathGuard()
    00169     {
    00170         reset();
    00171     }
    00172
    00178     const XPath*
    00179     operator->() const
    00180     {
    00181         assert(m_object != 0);
    00182
    00183         return m_object;
    00184     }
    00185
    00191     const XPath*
    00192     get() const
    00193     {
    00194         return m_object;
    00195     }
    00196
    00200     void
    00201     reset()
    00202     {
    00203         if (m_object != 0)
    00204         {
    00205             assert(m_factory != 0);
    00206
    00207             m_factory->returnObject(m_object);
    00208
    00209             m_object = 0;
    00210         }
    00211
    00212         m_factory = 0;
    00213     }
    00214
    00220     const XPath*
    00221     release()
    00222     {
    00223         const XPath* const  theTemp = m_object;
    00224
    00225         m_object = 0;
    00226
    00227         return theTemp;
    00228     }
    00229
    00230 private:
    00231
    00232     XPathGuard&
    00233     operator=(const XPathGuard&);
    00234
    00235     bool
    00236     operator==(const XPathGuard&) const;
    00237
    00238
    00239     // Data members...
    00240     XPathFactory*   m_factory;
    00241     const XPath*    m_object;
    00242 };
    00243
    00244
    00245
    00246 XALAN_CPP_NAMESPACE_END
    00247
    00248
    00249
    00250 #endif  // XPATHFACTORY_HEADER_GUARD_1357924680

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Xalan-C++ XSLT Processor Version 1.10 Copyright © 1999-2004 The Apache Software Foundation. All Rights Reserved.