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FunctionStringLength.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.
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00036  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
00037  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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00039  * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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00042  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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00046  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 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(FUNCTIONSTRINGLENGTH_HEADER_GUARD_1357924680)
00058 #define FUNCTIONSTRINGLENGTH_HEADER_GUARD_1357924680
00059 
00060 
00061 
00062 // Base header file.  Must be first.
00063 #include <XPath/XPathDefinitions.hpp>
00064 
00065 
00066 
00067 #include <PlatformSupport/DOMStringHelper.hpp>
00068 
00069 
00070 
00071 // Base class header file...
00072 #include <XPath/FunctionDefaultStringArgument.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 FunctionStringLength : public FunctionDefaultStringArgument
00091 {
00092 public:
00093 
00094     // These methods are inherited from FunctionDefaultStringArgument ...
00095 
00096     virtual XObject*
00097     execute(
00098             XPathExecutionContext&          executionContext,
00099             XalanNode*                      context,
00100             int                             /* opPos */,
00101             const XObjectArgVectorType&     args)
00102     {
00103         const XObjectArgVectorType::size_type   theSize = args.size();
00104 
00105         unsigned int    theLength = 0;
00106 
00107         if(theSize == 0)
00108         {
00109             if (context == 0)
00110             {
00111                 executionContext.error("The string-length() function requires a non-null context node!",
00112                                        context);
00113             }
00114             else
00115             {
00116                 theLength = length(getDefaultStringArgument(executionContext,
00117                                                             *context));
00118             }
00119         }
00120         else if (theSize == 1)
00121         {
00122             theLength = length(args[0]->str());
00123         }
00124         else
00125         {
00126             executionContext.error("The string-length() function takes either zero arguments or one argument!",
00127                                    context);
00128         }
00129 
00130         return executionContext.getXObjectFactory().createNumber(theLength);
00131     }
00132 
00133 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
00134     virtual Function*
00135 #else
00136     virtual FunctionStringLength*
00137 #endif
00138     clone() const
00139     {
00140         return new FunctionStringLength(*this);
00141     }
00142 
00143 private:
00144 
00145     // Not implemented...
00146     FunctionStringLength&
00147     operator=(const FunctionStringLength&);
00148 
00149     bool
00150     operator==(const FunctionStringLength&) const;
00151 };
00152 
00153 
00154 
00155 #endif  // FUNCTIONSTRINGLENGTH_HEADER_GUARD_1357924680

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