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FunctionName.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
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(FUNCTIONNAME_HEADER_GUARD_1357924680)
00058 #define FUNCTIONNAME_HEADER_GUARD_1357924680
00059 
00060 
00061 
00062 // Base header file.  Must be first.
00063 #include <XPath/XPathDefinitions.hpp>
00064 
00065 
00066 
00067 #include <cassert>
00068 
00069 
00070 
00071 // Base class header file...
00072 #include <XPath/Function.hpp>
00073 
00074 
00075 
00076 #include <XalanDOM/XalanNode.hpp>
00077 #include <XalanDOM/XalanAttr.hpp>
00078 #include <XalanDOM/XalanDOMString.hpp>
00079 
00080 
00081 
00082 #include <XPath/NodeRefListBase.hpp>
00083 #include <XPath/XObject.hpp>
00084 #include <XPath/XObjectFactory.hpp>
00085 #include <XPath/XPathExecutionContext.hpp>
00086 
00087 
00088 
00092 //
00093 // These are all inline, even though
00094 // there are virtual functions, because we expect that they will only be
00095 // needed by the XPath class.
00096 class XALAN_XPATH_EXPORT FunctionName : public Function
00097 {
00098 public:
00099 
00100     // These methods are inherited from Function ...
00101 
00102     virtual XObject*
00103     execute(
00104             XPathExecutionContext&          executionContext,
00105             XalanNode*                      context,
00106             int                             /* opPos */,
00107             const XObjectArgVectorType&     args)
00108     {
00109         const XObjectArgVectorType::size_type   theSize = args.size();
00110 
00111         XalanDOMString                          theResult;
00112 
00113         if(theSize == 0)
00114         {
00115             if (context == 0)
00116             {
00117                 executionContext.error("The name() function requires a non-null context node!",
00118                                        context);
00119             }
00120             else
00121             {
00122                 theResult = executionContext.getNameOfNode(*context);
00123             }
00124         }
00125         else if (theSize == 1)
00126         {
00127             assert(args[0] != 0);
00128 
00129             const NodeRefListBase&  theNodeList = args[0]->nodeset();
00130 
00131             if (theNodeList.getLength() != 0)
00132             {
00133                 assert(theNodeList.item(0) != 0);
00134 
00135                 theResult = executionContext.getNameOfNode(*theNodeList.item(0));
00136             }
00137         }
00138         else
00139         {
00140             executionContext.error("The name() function takes either zero arguments or one argument!",
00141                                    context);
00142         }
00143 
00144         return executionContext.getXObjectFactory().createString(theResult);
00145     }
00146 
00147 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
00148     virtual Function*
00149 #else
00150     virtual FunctionName*
00151 #endif
00152     clone() const
00153     {
00154         return new FunctionName(*this);
00155     }
00156 
00157 private:
00158 
00159     // Not implemented...
00160     FunctionName&
00161     operator=(const FunctionName&);
00162 
00163     bool
00164     operator==(const FunctionName&) const;
00165 };
00166 
00167 
00168 
00169 #endif  // FUNCTIONNAME_HEADER_GUARD_1357924680

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