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FunctionString.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(FUNCTIONSTRING_HEADER_GUARD_1357924680)
00058 #define FUNCTIONSTRING_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 #include <PlatformSupport/DOMStringHelper.hpp>
00072 
00073 
00074 
00075 // Base class header file...
00076 #include <XPath/FunctionDefaultStringArgument.hpp>
00077 
00078 
00079 
00080 #include <XPath/XObject.hpp>
00081 #include <XPath/XObjectFactory.hpp>
00082 #include <XPath/XPathExecutionContext.hpp>
00083 
00084 
00085 
00089 //
00090 // These are all inline, even though
00091 // there are virtual functions, because we expect that they will only be
00092 // needed by the XPath class.
00093 class XALAN_XPATH_EXPORT FunctionString : public FunctionDefaultStringArgument
00094 {
00095 public:
00096 
00097     // These methods are inherited from Function ...
00098 
00099     virtual XObject*
00100     execute(
00101             XPathExecutionContext&          executionContext,
00102             XalanNode*                      context,
00103             int                             /* opPos */,
00104             const XObjectArgVectorType&     args)
00105     {
00106         XObject*        theResult = 0;
00107 
00108         const XObjectArgVectorType::size_type   theSize = args.size();
00109 
00110         if(theSize > 1)
00111         {
00112             executionContext.error("The string() function takes zero or one argument!",
00113                                    context);
00114         }
00115         else if(theSize == 0)
00116         {
00117             if (context == 0)
00118             {
00119                 executionContext.error("The string() function requires a non-null context node!",
00120                                        context);
00121             }
00122             else
00123             {
00124                 theResult = executionContext.getXObjectFactory().createString(
00125                                     getDefaultStringArgument(
00126                                             executionContext,
00127                                             *context));
00128             }
00129         }
00130         else
00131         {
00132             assert(args[0] != 0);
00133 
00134             theResult = executionContext.getXObjectFactory().createString(args[0]->str());
00135         }
00136 
00137         return theResult;
00138     }
00139 
00140 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
00141     virtual Function*
00142 #else
00143     virtual FunctionString*
00144 #endif
00145     clone() const
00146     {
00147         return new FunctionString(*this);
00148     }
00149 
00150 private:
00151 
00152     // Not implemented...
00153     FunctionString&
00154     operator=(const FunctionString&);
00155 
00156     bool
00157     operator==(const FunctionString&) const;
00158 };
00159 
00160 
00161 
00162 #endif  // FUNCTIONSTRING_HEADER_GUARD_1357924680

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