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FunctionNamespaceURI.hpp

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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
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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.
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00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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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
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00055  * <http://www.apache.org/>.
00056  */
00057 #if !defined(FUNCTIONNAMESPACEURI_HEADER_GUARD_1357924680)
00058 #define FUNCTIONNAMESPACEURI_HEADER_GUARD_1357924680
00059 
00060 
00061 
00062 // Base header file.  Must be first.
00063 #include <XPath/XPathDefinitions.hpp>
00064 
00065 
00066 
00067 #include <vector>
00068 
00069 
00070 
00071 // Base class header file...
00072 #include <XPath/Function.hpp>
00073 
00074 
00075 
00076 #include <XPath/NodeRefListBase.hpp>
00077 #include <XPath/XObject.hpp>
00078 #include <XPath/XObjectFactory.hpp>
00079 #include <XPath/XPathExecutionContext.hpp>
00080 
00081 
00082 
00086 //
00087 // These are all inline, even though
00088 // there are virtual functions, because we expect that they will only be
00089 // needed by the XPath class.
00090 class XALAN_XPATH_EXPORT FunctionNamespaceURI : public Function
00091 {
00092 public:
00093 
00094     // These methods are inherited from Function ...
00095 
00096     virtual XObject*
00097     execute(
00098             XPathExecutionContext&          executionContext,
00099             XalanNode*                      context,
00100             int                             /* opPos */,
00101             const XObjectArgVectorType&     args)
00102     {
00103         XalanDOMString  theNamespace;
00104 
00105         if (args.size() > 1)
00106         {
00107             executionContext.error("The namespace-uri() function takes zero arguments or one argument!",
00108                                    context);
00109         }
00110         else if (args.size() == 1)
00111         {
00112             theNamespace = getNamespaceFromNodeSet(*args[0],
00113                                                    executionContext);
00114         }
00115         else if (context == 0)
00116         {
00117             executionContext.error("The namespace-uri() function requires a non-null context node!",
00118                                    context);
00119         }
00120         else
00121         {
00122             // The XPath standard says that if there are no arguments,
00123             // the argument defaults to a node set with the context node
00124             // as the only member.
00125             // So we have to create an XObject with the context node as
00126             // the only member.
00127             // We shroud the temporary getNamespaceFromNodeSet( in a
00128             // FactoryObjectAutoPointer because it can be deleted once
00129             // we're done.
00130 
00131             // An XObject that contains the context node.
00132             XObjectGuard    theXObject(executionContext.getXObjectFactory(),
00133                                        executionContext.createNodeSet(*context));
00134 
00135 
00136             theNamespace = getNamespaceFromNodeSet(*theXObject.get(),
00137                                                    executionContext);
00138         }
00139 
00140         return executionContext.getXObjectFactory().createString(theNamespace);
00141     }
00142 
00143     virtual Function*
00144     clone() const
00145     {
00146         return new FunctionNamespaceURI(*this);
00147     }
00148 
00149 private:
00150 
00151     static XalanDOMString
00152     getNamespaceFromNodeSet(const XObject&          theXObject,
00153                             XPathExecutionContext&  theContext)
00154     {
00155         XalanDOMString  theNamespace;
00156 
00157         const NodeRefListBase&  theList = theXObject.nodeset();
00158 
00159         if (theList.getLength() > 0)
00160         {
00161             theNamespace = theContext.getNamespaceOfNode(*theList.item(0));
00162         }
00163 
00164         return theNamespace;
00165     }
00166 
00167     // Not implemented...
00168     FunctionNamespaceURI&
00169     operator=(const FunctionNamespaceURI&);
00170 
00171     bool
00172     operator==(const FunctionNamespaceURI&) const;
00173 };
00174 
00175 
00176 
00177 #endif  // FUNCTIONNAMESPACEURI_HEADER_GUARD_1357924680

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