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FunctionTranslate.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(FUNCTIONTRANSLATE_HEADER_GUARD_1357924680)
00058 #define FUNCTIONTRANSLATE_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/Function.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 FunctionTranslate : public Function
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         if (args.size() != 3)
00107         {
00108             executionContext.error("The translate() function takes three arguments!",
00109                                    context);
00110         }
00111 
00112         const XalanDOMString&   theFirstString = args[0]->str();
00113         const XalanDOMString&   theSecondString = args[1]->str();
00114         const XalanDOMString&   theThirdString = args[2]->str();
00115 
00116         const unsigned int      theFirstStringLength = length(theFirstString);
00117         const unsigned int      theSecondStringLength = length(theSecondString);
00118         const unsigned int      theThirdStringLength = length(theThirdString);
00119 
00120 #if !defined(XALAN_NO_NAMESPACES)
00121         using std::vector;
00122 #endif
00123 
00124         // A vector to contain the new characters.  We'll use it to construct
00125         // the result string.
00126         vector<XalanDOMChar>    theBuffer;
00127 
00128         // The result string can only be as large as the first string, so
00129         // just reserve the space now.  Also reserve space for the
00130         // terminating 0.
00131         theBuffer.reserve(theFirstStringLength + 1);
00132 
00133         for (unsigned int i = 0; i < theFirstStringLength; i++)
00134         {
00135             const XalanDOMChar      theCurrentChar = charAt(theFirstString, i);
00136 
00137             const unsigned int      theIndex = indexOf(theSecondString, theCurrentChar);
00138 
00139             if (theIndex >= theSecondStringLength)
00140             {
00141                 // Didn't find the character in the second string, so it
00142                 // is not translated.
00143                 theBuffer.push_back(theCurrentChar);
00144             }
00145             else if (theIndex < theThirdStringLength)
00146             {
00147                 // OK, there's a corresponding character in the
00148                 // third string, so do the translation...
00149                 theBuffer.push_back(charAt(theThirdString, theIndex));
00150             }
00151             else
00152             {
00153                 // There's no corresponding character in the
00154                 // third string, since it's shorter than the
00155                 // second string.  In this case, the character
00156                 // is removed from the output string, so don't
00157                 // do anything.
00158             }
00159         }
00160 
00161         return executionContext.getXObjectFactory().createString(XalanDOMString(theBuffer.begin(), theBuffer.size()));
00162     }
00163 
00164 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE)
00165     virtual Function*
00166 #else
00167     virtual FunctionTranslate*
00168 #endif
00169     clone() const
00170     {
00171         return new FunctionTranslate(*this);
00172     }
00173 
00174 private:
00175 
00176     // Not implemented...
00177     FunctionTranslate&
00178     operator=(const FunctionTranslate&);
00179 
00180     bool
00181     operator==(const FunctionTranslate&) const;
00182 };
00183 
00184 
00185 
00186 #endif  // FUNCTIONTRANSLATE_HEADER_GUARD_1357924680

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