## Xalan-C++ API Documentation

### The Xalan C++ XSLT Processor Version 1.5

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# XPathExecutionContext.hpp

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    00001 /*
    00002  * The Apache Software License, Version 1.1
    00003  *
    00004  *
    00005  * Copyright (c) 1999-2002 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  * @author <a href="mailto:david_n_bertoni@lotus.com">David N. Bertoni</a>
    00058  */
    00059 #if !defined(XPATHEXECUTIONCONTEXT_HEADER_GUARD_1357924680)
    00060 #define XPATHEXECUTIONCONTEXT_HEADER_GUARD_1357924680
    00061
    00062
    00063
    00064 // Base include file.  Must be first.
    00065 #include <XPath/XPathDefinitions.hpp>
    00066
    00067
    00068
    00069 #include <cassert>
    00070 #include <vector>
    00071
    00072
    00073
    00074 #include <XalanDOM/XalanDOMString.hpp>
    00075
    00076
    00077
    00078 // Base class header file...
    00079 #include <PlatformSupport/ExecutionContext.hpp>
    00080
    00081
    00082
    00083 #include <XPath/MutableNodeRefList.hpp>
    00084 #include <XPath/ResultTreeFragBase.hpp>
    00085
    00086
    00087
    00088 XALAN_CPP_NAMESPACE_BEGIN
    00089
    00090
    00091
    00092 class XalanDecimalFormatSymbols;
    00093 class PrefixResolver;
    00094 class XalanQName;
    00095 class XObject;
    00096 class XObjectPtr;
    00097 class XObjectFactory;
    00098 class XalanDocument;
    00099 class XalanElement;
    00100 class XalanNode;
    00101 class XalanText;
    00102
    00103
    00104
    00105 //
    00106 // An abstract class which provides support for executing XPath functions
    00107 // and extension functions.
    00108 //
    00109
    00110 class XALAN_XPATH_EXPORT XPathExecutionContext : public ExecutionContext
    00111 {
    00112 public:
    00113
    00114 #if defined(XALAN_NO_STD_NAMESPACE)
    00115     typedef vector<XObjectPtr>          XObjectArgVectorType;
    00116 #else
    00117     typedef std::vector<XObjectPtr>     XObjectArgVectorType;
    00118 #endif
    00119
    00120     typedef NodeRefListBase::size_type  size_type;
    00121
    00122     explicit
    00123     XPathExecutionContext(XObjectFactory*   theXObjectFactory = 0);
    00124
    00125     virtual
    00126     ~XPathExecutionContext();
    00127
    00132     virtual void
    00133     reset() = 0;
    00134
    00140     virtual XalanNode*
    00141     getCurrentNode() const = 0;
    00142
    00148     virtual void
    00149     setCurrentNode(XalanNode*   theCurrentNode) = 0;
    00150
    00151     class CurrentNodeSetAndRestore
    00152     {
    00153     public:
    00154
    00155         CurrentNodeSetAndRestore(
    00156                 XPathExecutionContext&  theExecutionContext,
    00157                 XalanNode*              theNewNode) :
    00158             m_executionContext(theExecutionContext),
    00159             m_savedNode(theExecutionContext.getCurrentNode())
    00160         {
    00161             theExecutionContext.setCurrentNode(theNewNode);
    00162         }
    00163
    00164         CurrentNodeSetAndRestore(
    00165                 XPathExecutionContext&  theExecutionContext,
    00166                 XalanNode*              theOldNode,
    00167                 XalanNode*              theNewNode) :
    00168             m_executionContext(theExecutionContext),
    00169             m_savedNode(theOldNode)
    00170         {
    00171             assert(theExecutionContext.getCurrentNode() == theOldNode);
    00172
    00173             theExecutionContext.setCurrentNode(theNewNode);
    00174         }
    00175
    00176         ~CurrentNodeSetAndRestore()
    00177         {
    00178             m_executionContext.setCurrentNode(m_savedNode);
    00179         }
    00180
    00181     private:
    00182
    00183         XPathExecutionContext&  m_executionContext;
    00184         XalanNode* const        m_savedNode;
    00185     };
    00186
    00192     XObjectFactory&
    00193     getXObjectFactory() const
    00194     {
    00195         assert(m_xobjectFactory != 0);
    00196
    00197         return *m_xobjectFactory;
    00198     }
    00199
    00207     virtual bool
    00208     isNodeAfter(
    00209             const XalanNode&    node1,
    00210             const XalanNode&    node2) const = 0;
    00211
    00217     virtual const NodeRefListBase&
    00218     getContextNodeList() const = 0;
    00219
    00225     virtual void
    00226     setContextNodeList(const NodeRefListBase&   theList) = 0;
    00227
    00228     class ContextNodeListSetAndRestore
    00229     {
    00230     public:
    00231
    00232         ContextNodeListSetAndRestore(
    00233                 XPathExecutionContext&      theExecutionContext,
    00234                 const NodeRefListBase&      theNodeList) :
    00235             m_executionContext(theExecutionContext),
    00236             m_savedNodeList(theExecutionContext.getContextNodeList())
    00237         {
    00238             m_executionContext.setContextNodeList(theNodeList);
    00239         }
    00240
    00241         ~ContextNodeListSetAndRestore()
    00242         {
    00243             m_executionContext.setContextNodeList(m_savedNodeList);
    00244         }
    00245
    00246     private:
    00247
    00248         XPathExecutionContext&  m_executionContext;
    00249         const NodeRefListBase&  m_savedNodeList;
    00250     };
    00251
    00252     /*
    00253      * Get the count of nodes in the current context node list.
    00254      *
    00255      * @return length of list
    00256      */
    00257     virtual size_type
    00258     getContextNodeListLength() const = 0;
    00259
    00260     /*
    00261      * Get the position of the node in the current context node list.
    00262      * Note that this is 1-based indexing (XPath/XSLT-style), not 0-based.
    00263      * Thus, 0 will be returned if the node was not found.
    00264      *
    00265      * @return position in list
    00266      */
    00267     virtual size_type
    00268     getContextNodeListPosition(const XalanNode&     contextNode) const = 0;
    00269
    00277     virtual bool
    00278     elementAvailable(const XalanQName&  theQName) const = 0;
    00279
    00289     virtual bool
    00290     elementAvailable(
    00291             const XalanDOMString&   theName,
    00292             const LocatorType*      locator) const = 0;
    00293
    00301     virtual bool
    00302     functionAvailable(const XalanQName&     theQName) const = 0;
    00303
    00312     virtual bool
    00313     functionAvailable(
    00314             const XalanDOMString&   theName,
    00315             const LocatorType*      locator) const = 0;
    00316
    00327     virtual const XObjectPtr
    00328     extFunction(
    00329             const XalanDOMString&           theNamespace,
    00330             const XalanDOMString&           functionName,
    00331             XalanNode*                      context,
    00332             const XObjectArgVectorType&     argVec,
    00333             const LocatorType*              locator) = 0;
    00334
    00342     virtual XalanDocument*
    00343     parseXML(
    00344             const XalanDOMString&   urlString,
    00345             const XalanDOMString&   base) const = 0;
    00346
    00352     virtual MutableNodeRefList*
    00353     borrowMutableNodeRefList() = 0;
    00354
    00361     virtual bool
    00362     returnMutableNodeRefList(MutableNodeRefList*    theList) = 0;
    00363
    00364     class BorrowReturnMutableNodeRefList
    00365     {
    00366     public:
    00367
    00368         BorrowReturnMutableNodeRefList(XPathExecutionContext&   executionContext) :
    00369             m_xpathExecutionContext(&executionContext),
    00370             m_mutableNodeRefList(executionContext.borrowMutableNodeRefList())
    00371         {
    00372             assert(m_mutableNodeRefList != 0);
    00373         }
    00374
    00375         // N.B. Non-const copy constructor semantics (like std::auto_ptr)
    00376         BorrowReturnMutableNodeRefList(const BorrowReturnMutableNodeRefList&    theSource) :
    00377             m_xpathExecutionContext(theSource.m_xpathExecutionContext),
    00378             m_mutableNodeRefList(theSource.m_mutableNodeRefList)
    00379         {
    00380             assert(m_mutableNodeRefList != 0);
    00381
    00382             ((BorrowReturnMutableNodeRefList&)theSource).m_mutableNodeRefList = 0;
    00383         }
    00384
    00385         ~BorrowReturnMutableNodeRefList()
    00386         {
    00387             release();
    00388         }
    00389
    00390         MutableNodeRefList&
    00391         operator*() const
    00392         {
    00393             assert(m_mutableNodeRefList != 0);
    00394
    00395             return *m_mutableNodeRefList;
    00396         }
    00397
    00398         MutableNodeRefList*
    00399         get() const
    00400         {
    00401             return m_mutableNodeRefList;
    00402         }
    00403
    00404         MutableNodeRefList*
    00405         operator->() const
    00406         {
    00407             return get();
    00408         }
    00409
    00410         void
    00411         release()
    00412         {
    00413             assert(m_xpathExecutionContext != 0);
    00414
    00415             if (m_mutableNodeRefList != 0)
    00416             {
    00417                 m_xpathExecutionContext->returnMutableNodeRefList(m_mutableNodeRefList);
    00418
    00419                 m_mutableNodeRefList = 0;
    00420             }
    00421         }
    00422
    00423         BorrowReturnMutableNodeRefList
    00424         clone() const
    00425         {
    00426             assert(m_xpathExecutionContext != 0);
    00427
    00428             BorrowReturnMutableNodeRefList  theResult(*m_xpathExecutionContext);
    00429
    00430             *theResult = *m_mutableNodeRefList;
    00431
    00432             return theResult;
    00433         }
    00434
    00435         // N.B. Non-const assignment operator semantics.
    00436         BorrowReturnMutableNodeRefList&
    00437         operator=(BorrowReturnMutableNodeRefList&   theRHS)
    00438         {
    00439             release();
    00440
    00441             m_xpathExecutionContext = theRHS.m_xpathExecutionContext;
    00442
    00443             m_mutableNodeRefList = theRHS.m_mutableNodeRefList;
    00444
    00445             theRHS.m_mutableNodeRefList = 0;
    00446
    00447             return *this;
    00448         }
    00449
    00450     private:
    00451
    00452         XPathExecutionContext*  m_xpathExecutionContext;
    00453
    00454         MutableNodeRefList*     m_mutableNodeRefList;
    00455     };
    00456
    00462     virtual XalanDOMString&
    00463     getCachedString() = 0;
    00464
    00472     virtual bool
    00473     releaseCachedString(XalanDOMString&     theString) = 0;
    00474
    00475     class GetAndReleaseCachedString
    00476     {
    00477     public:
    00478
    00479         GetAndReleaseCachedString(XPathExecutionContext&    theExecutionContext) :
    00480             m_executionContext(&theExecutionContext),
    00481             m_string(&theExecutionContext.getCachedString())
    00482         {
    00483         }
    00484
    00485         // Note non-const copy semantics...
    00486         GetAndReleaseCachedString(GetAndReleaseCachedString&    theSource) :
    00487             m_executionContext(theSource.m_executionContext),
    00488             m_string(theSource.m_string)
    00489         {
    00490             theSource.m_string = 0;
    00491         }
    00492
    00493         ~GetAndReleaseCachedString()
    00494         {
    00495             if (m_string != 0)
    00496             {
    00497                 m_executionContext->releaseCachedString(*m_string);
    00498             }
    00499         }
    00500
    00501         XalanDOMString&
    00502         get() const
    00503         {
    00504             assert(m_string != 0);
    00505
    00506             return *m_string;
    00507         }
    00508
    00509         XPathExecutionContext&
    00510         getExecutionContext() const
    00511         {
    00512             return *m_executionContext;
    00513         }
    00514
    00515     private:
    00516
    00517         // Not implemented...
    00518         GetAndReleaseCachedString&
    00519         operator=(const GetAndReleaseCachedString&);
    00520
    00521
    00522         // Data members...
    00523         XPathExecutionContext*  m_executionContext;
    00524
    00525         XalanDOMString*         m_string;
    00526     };
    00527
    00533     virtual MutableNodeRefList*
    00534     createMutableNodeRefList() const = 0;
    00535
    00546     virtual void
    00547     getNodeSetByKey(
    00548             XalanDocument*          doc,
    00549             const XalanQName&       qname,
    00550             const XalanDOMString&   ref,
    00551             MutableNodeRefList&     nodelist) = 0;
    00552
    00565     virtual void
    00566     getNodeSetByKey(
    00567             XalanDocument*          doc,
    00568             const XalanDOMString&   name,
    00569             const XalanDOMString&   ref,
    00570             const LocatorType*      locator,
    00571             MutableNodeRefList&     nodelist) = 0;
    00572
    00580     virtual const XObjectPtr
    00581     getVariable(
    00582             const XalanQName&   name,
    00583             const LocatorType*  locator = 0) = 0;
    00584
    00590     virtual const PrefixResolver*
    00591     getPrefixResolver() const = 0;
    00592
    00598     virtual void
    00599     setPrefixResolver(const PrefixResolver*     thePrefixResolver) = 0;
    00600
    00601     class PrefixResolverSetAndRestore
    00602     {
    00603     public:
    00604
    00605         PrefixResolverSetAndRestore(
    00606                 XPathExecutionContext&  theExecutionContext,
    00607                 const PrefixResolver*   theResolver) :
    00608             m_executionContext(theExecutionContext),
    00609             m_savedResolver(theExecutionContext.getPrefixResolver())
    00610         {
    00611             m_executionContext.setPrefixResolver(theResolver);
    00612         }
    00613
    00614         PrefixResolverSetAndRestore(
    00615                 XPathExecutionContext&  theExecutionContext,
    00616                 const PrefixResolver*   theOldResolver,
    00617                 const PrefixResolver*   theNewResolver) :
    00618             m_executionContext(theExecutionContext),
    00619             m_savedResolver(theOldResolver)
    00620         {
    00621             m_executionContext.setPrefixResolver(theNewResolver);
    00622         }
    00623
    00624         ~PrefixResolverSetAndRestore()
    00625         {
    00626             m_executionContext.setPrefixResolver(m_savedResolver);
    00627         }
    00628
    00629     private:
    00630
    00631         XPathExecutionContext&          m_executionContext;
    00632         const PrefixResolver* const     m_savedResolver;
    00633     };
    00634
    00641     virtual const XalanDOMString*
    00642     getNamespaceForPrefix(const XalanDOMString&     prefix) const = 0;
    00643
    00651     virtual XalanDOMString
    00652     findURIFromDoc(const XalanDocument*     owner) const = 0;
    00653
    00664     virtual const XalanDOMString&
    00665     getUnparsedEntityURI(
    00666             const XalanDOMString&   theName,
    00667             const XalanDocument&    theDocument) const = 0;
    00668
    00679     virtual bool
    00680     shouldStripSourceNode(const XalanNode&  node) = 0;
    00681
    00689     virtual bool
    00690     getThrowFoundIndex() const = 0;
    00691
    00699     virtual void
    00700     setThrowFoundIndex(bool     fThrow) = 0;
    00701
    00702     virtual XalanDocument*
    00703     getSourceDocument(const XalanDOMString&     theURI) const = 0;
    00704
    00711     virtual void
    00712     setSourceDocument(
    00713             const XalanDOMString&   theURI,
    00714             XalanDocument*          theDocument) = 0;
    00715
    00716
    00724     virtual const XalanDecimalFormatSymbols*
    00725     getDecimalFormatSymbols(const XalanQName&   qname) = 0;
    00726
    00727     // These interfaces are inherited from ExecutionContext...
    00728
    00729     virtual void
    00730     error(
    00731             const XalanDOMString&   msg,
    00732             const XalanNode*        sourceNode = 0,
    00733             const LocatorType*      locator = 0) const = 0;
    00734
    00735     virtual void
    00736     error(
    00737             const char*         msg,
    00738             const XalanNode*    sourceNode = 0,
    00739             const LocatorType*  locator = 0) const = 0;
    00740
    00741     virtual void
    00742     warn(
    00743             const XalanDOMString&   msg,
    00744             const XalanNode*        sourceNode = 0,
    00745             const LocatorType*      locator = 0) const = 0;
    00746
    00747     virtual void
    00748     warn(
    00749             const char*         msg,
    00750             const XalanNode*    sourceNode = 0,
    00751             const LocatorType*  locator = 0) const = 0;
    00752
    00753     virtual void
    00754     message(
    00755             const XalanDOMString&   msg,
    00756             const XalanNode*        sourceNode = 0,
    00757             const LocatorType*      locator = 0) const = 0;
    00758
    00759     virtual void
    00760     message(
    00761             const char*         msg,
    00762             const XalanNode*    sourceNode = 0,
    00763             const LocatorType*  locator = 0) const = 0;
    00764
    00765 protected:
    00766
    00767     XObjectFactory*     m_xobjectFactory;
    00768 };
    00769
    00770
    00771
    00772 XALAN_CPP_NAMESPACE_END
    00773
    00774
    00775
    00776 #endif  // XPATHEXECUTIONCONTEXT_HEADER_GUARD_1357924680

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