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(FUNCTIONROUND_HEADER_GUARD_1357924680) 00058 #define FUNCTIONROUND_HEADER_GUARD_1357924680 00059 00060 00061 00062 // Base header file. Must be first. 00063 #include <XPath/XPathDefinitions.hpp> 00064 00065 00066 00067 #include <cmath> 00068 #include <vector> 00069 00070 00071 00072 // Base class header file... 00073 #include <XPath/Function.hpp> 00074 00075 00076 00077 #include <PlatformSupport/DoubleSupport.hpp> 00078 00079 00080 00081 #include <XPath/XObject.hpp> 00082 #include <XPath/XObjectFactory.hpp> 00083 #include <XPath/XPathExecutionContext.hpp> 00084 00085 00086 00090 // 00091 // These are all inline, even though 00092 // there are virtual functions, because we expect that they will only be 00093 // needed by the XPath class. 00094 class XALAN_XPATH_EXPORT FunctionRound : public Function 00095 { 00096 public: 00097 00098 // These methods are inherited from Function ... 00099 00100 virtual XObject* 00101 execute( 00102 XPathExecutionContext& executionContext, 00103 XalanNode* context, 00104 int /* opPos */, 00105 const XObjectArgVectorType& args) 00106 { 00107 if (args.size() != 1) 00108 { 00109 executionContext.error("The round() function takes one argument!", 00110 context); 00111 } 00112 00113 const double theValue = args[0]->num(); 00114 00115 return executionContext.getXObjectFactory().createNumber(getRoundedValue(theValue)); 00116 } 00117 00118 #if defined(XALAN_NO_COVARIANT_RETURN_TYPE) 00119 virtual Function* 00120 #else 00121 virtual FunctionRound* 00122 #endif 00123 clone() const 00124 { 00125 return new FunctionRound(*this); 00126 } 00127 00128 static double 00129 getRoundedValue(double theValue) 00130 { 00131 if (DoubleSupport::isNaN(theValue)) 00132 { 00133 return DoubleSupport::getNaN(); 00134 } 00135 else if (DoubleSupport::isPositiveInfinity(theValue)) 00136 { 00137 return DoubleSupport::getPositiveInfinity(); 00138 } 00139 if (DoubleSupport::isNegativeInfinity(theValue)) 00140 { 00141 return DoubleSupport::getNegativeInfinity(); 00142 } 00143 else if (theValue == 0) 00144 { 00145 return 0.0; 00146 } 00147 else if (theValue > 0) 00148 { 00149 return long(theValue + 0.5); 00150 } 00151 else 00152 { 00153 // Negative numbers are a special case. Any time we 00154 // have -0.5 as the fractional part, we have to 00155 // round up (toward 0), rather than down. 00156 double intPart = 0; 00157 00158 const double fracPart = modf(theValue, &intPart); 00159 00160 if (fracPart == -0.5) 00161 { 00162 // special case -- we have have to round toward 0... 00163 return long(theValue + 0.5); 00164 } 00165 else 00166 { 00167 return long(theValue - 0.5); 00168 } 00169 } 00170 } 00171 00172 private: 00173 00174 // Not implemented... 00175 FunctionRound& 00176 operator=(const FunctionRound&); 00177 00178 bool 00179 operator==(const FunctionRound&) const; 00180 }; 00181 00182 00183 00184 #endif // FUNCTIONROUND_HEADER_GUARD_1357924680
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