XMLBigInteger.hpp

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00001 /*
00002  * Licensed to the Apache Software Foundation (ASF) under one or more
00003  * contributor license agreements.  See the NOTICE file distributed with
00004  * this work for additional information regarding copyright ownership.
00005  * The ASF licenses this file to You under the Apache License, Version 2.0
00006  * (the "License"); you may not use this file except in compliance with
00007  * the License.  You may obtain a copy of the License at
00008  * 
00009  *      http://www.apache.org/licenses/LICENSE-2.0
00010  * 
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 
00018 /*
00019  * $Id: XMLBigInteger.hpp 557254 2007-07-18 13:28:54Z amassari $
00020  */
00021 
00022 #if !defined(XERCESC_INCLUDE_GUARD_XML_BIGINTEGER_HPP)
00023 #define XERCESC_INCLUDE_GUARD_XML_BIGINTEGER_HPP
00024 
00025 #include <xercesc/util/XMemory.hpp>
00026 #include <xercesc/util/XMLString.hpp>
00027 
00028 XERCES_CPP_NAMESPACE_BEGIN
00029 
00030 class XMLUTIL_EXPORT XMLBigInteger : public XMemory
00031 {
00032 public:
00033 
00047     XMLBigInteger
00048     (
00049         const XMLCh* const strValue
00050         , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
00051     );
00052     ~XMLBigInteger();
00053 
00054     XMLBigInteger(const XMLBigInteger& toCopy);
00055 
00056     static XMLCh* getCanonicalRepresentation
00057                         (
00058                           const XMLCh*         const rawData
00059                         ,       MemoryManager* const memMgr = XMLPlatformUtils::fgMemoryManager
00060                         ,       bool                 isNonPositiveInteger = false
00061                         );
00062 
00063     static void parseBigInteger(const XMLCh* const toConvert
00064                               , XMLCh* const       retBuffer
00065                               , int&   signValue
00066                               , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
00067 
00068     static int  compareValues(const XMLBigInteger* const lValue
00069                              ,const XMLBigInteger* const rValue
00070                              , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
00071 
00072 
00073     static int  compareValues(const XMLCh*         const lString
00074                             , const int&                 lSign
00075                             , const XMLCh*         const rString
00076                             , const int&                 rSign
00077                             ,       MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
00078 
00079     void        multiply(const unsigned int byteToShift);
00080 
00081     void        divide(const unsigned int byteToShift);
00082 
00083     unsigned int       getTotalDigit() const;
00084    
00090     inline XMLCh*      getRawData() const;
00091 
00102     bool operator==(const XMLBigInteger& toCompare) const;
00103 
00108     int getSign() const;
00109 
00110     int intValue() const;
00111 
00112 private:
00113     // -----------------------------------------------------------------------
00114     //  Unimplemented constructors and operators
00115     // -----------------------------------------------------------------------    
00116     XMLBigInteger& operator=(const XMLBigInteger&);
00117 
00118 
00119     void setSign(int);
00120 
00121     /*
00122      * The number is internally stored in "minimal" sign-fMagnitude format
00123      * (i.e., no BigIntegers have a leading zero byte in their magnitudes).
00124      * Zero is represented with a signum of 0 (and a zero-length fMagnitude).
00125      * Thus, there is exactly one representation for each value.
00126      */
00127     // -----------------------------------------------------------------------
00128     //  Private data members
00129     //
00130     //  fSign
00131     //     to represent the sign of the number.
00132     //
00133     //  fMagnitude
00134     //     the buffer holding the number.
00135     //
00136     //  fRawData
00137     //     to preserve the original string used to construct this object,
00138     //     needed for pattern matching.
00139     //
00140     // -----------------------------------------------------------------------
00141 
00142     int         fSign;
00143     XMLCh*      fMagnitude;  //null terminated
00144     XMLCh*      fRawData;
00145     MemoryManager* fMemoryManager;
00146 };
00147 
00148 inline int XMLBigInteger::getSign() const
00149 {    
00150     return fSign;
00151 }
00152 
00153 inline unsigned int XMLBigInteger::getTotalDigit() const
00154 {
00155     return ((getSign() ==0) ? 0 : (unsigned int)XMLString::stringLen(fMagnitude));
00156 }
00157 
00158 inline bool XMLBigInteger::operator==(const XMLBigInteger& toCompare) const
00159 {
00160     return ( compareValues(this, &toCompare, fMemoryManager) ==0 ? true : false);
00161 }
00162 
00163 inline void XMLBigInteger::setSign(int newSign)
00164 {
00165     fSign = newSign;
00166 }
00167 
00168 inline XMLCh*  XMLBigInteger::getRawData() const
00169 {
00170     return fRawData;
00171 }
00172 
00173 XERCES_CPP_NAMESPACE_END
00174 
00175 #endif

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