Open Babel: xml.h Source File

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# xml.h

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    00001 /**********************************************************************
    00002 xml.h Declaration of XMLConversion,
    00003 declaration and definition of XMLBaseFormat and XMLMoleculeFormat
    00004 Copyright (C) 2005-2006 by Chris Morley
    00005
    00006 This program is free software; you can redistribute it and/or modify
    00007 it under the terms of the GNU General Public License as published by
    00008 the Free Software Foundation version 2 of the License.
    00009
    00010 This program is distributed in the hope that it will be useful,
    00011 but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013 GNU General Public License for more details.
    00014 ***********************************************************************/
    00015
    00016 #ifndef OB_XML_H
    00017 #define OB_XML_H
    00018
    00019 #include <typeinfo>
    00020
    00021 #include <openbabel/mol.h>
    00022 #include <openbabel/obconversion.h>
    00023 #include <openbabel/obmolecformat.h>
    00024
    00025 #include <libxml/xmlreader.h>
    00026 #include <libxml/xmlwriter.h>
    00027 #include <typeinfo>
    00028
    00029 namespace OpenBabel
    00030 {
    00031
    00032
    00033   //forward declaration
    00034   class XMLBaseFormat;
    00035
    00036   //******************************************************
    00053   class XMLConversion : public OBConversion
    00054     {
    00055     public:
    00057       XMLConversion(OBConversion* pConv);
    00058
    00060       ~XMLConversion();
    00061
    00062       bool SetupReader();
    00063       bool SetupWriter();
    00064
    00066       bool ReadXML(XMLBaseFormat* pFormat, OBBase* pOb);
    00067
    00070       int SkipXML(const char* ctag);
    00071
    00072       typedef std::map<std::string, XMLBaseFormat*> NsMapType;
    00073
    00076       static NsMapType& Namespaces()
    00077         {
    00078           static NsMapType ns;
    00079           return ns;
    00080
    00081           //static NsMapType* nsm = NULL;
    00082           //if (!nsm)
    00083           //  nsm = new NsMapType;
    00084           //return *nsm;
    00085         };
    00086
    00087       static void RegisterXMLFormat(XMLBaseFormat* pFormat,
    00088                                     bool IsDefault=false, const char* uri=NULL);
    00089
    00091       static XMLConversion* GetDerived(OBConversion* pConv, bool ForReading=true);
    00092
    00095       bool IsLast()
    00096         { return _pConv->IsLast(); }
    00097       int GetOutputIndex()
    00098         { return  _pConv->GetOutputIndex(); }
    00099
    00100
    00101       xmlTextReaderPtr GetReader() const
    00102         { return _reader;   };
    00103
    00104       xmlTextWriterPtr GetWriter() const
    00105         { return _writer;   };
    00106
    00107       void OutputToStream()
    00108         {
    00109           xmlOutputBufferFlush(_buf);
    00110         }
    00111
    00112       static XMLBaseFormat* GetDefaultXMLClass() //TODO make dependent on object type
    00113         { return _pDefault;};
    00114
    00115       void LookForNamespace()
    00116         { _LookingForNamespace = true; };
    00117
    00119       static int ReadStream(void * context, char * buffer, int len);
    00120       static int WriteStream(void * context, const char * buffer, int len);
    00121       //static int CloseStream(void* context);
    00122
    00123       std::string GetAttribute(const char* attrname);
    00124
    00126       std::string GetContent();
    00127
    00129       bool    GetContentInt(int& value);
    00130
    00132       bool GetContentDouble(double& value);
    00133
    00134     private:
    00135       static XMLBaseFormat* _pDefault;
    00136       OBConversion* _pConv;
    00137       std::streampos  _requestedpos, _lastpos;
    00138       xmlTextReaderPtr _reader;
    00139       xmlTextWriterPtr _writer;
    00140       xmlOutputBufferPtr _buf;
    00141       //    xmlBufferPtr _buf;
    00142       bool _LookingForNamespace;
    00143     public:
    00144       bool _SkipNextRead;
    00145     };
    00146
    00147   //*************************************************
    00150   class XMLBaseFormat : public OBFormat
    00151     {
    00152     protected:
    00153       XMLConversion* _pxmlConv;
    00154
    00155       //formating for output
    00156       std::string _prefix;
    00157       int baseindent, ind;
    00158       std::string nsdecl;
    00159       int _embedlevel;
    00160
    00161     public:
    00162       ~XMLBaseFormat(){}
    00163       virtual const char* NamespaceURI()const=0;
    00164       virtual bool DoElement(const std::string& ElName){return false;};
    00165       virtual bool EndElement(const std::string& ElName){return false;};
    00167       virtual const char* EndTag(){return ">";};
    00168
    00169     protected:
    00170       xmlTextReaderPtr reader() const
    00171         {
    00172           return _pxmlConv->GetReader();
    00173         }
    00174
    00175       xmlTextWriterPtr writer() const
    00176         {
    00177           return _pxmlConv->GetWriter();
    00178         }
    00179
    00180       void OutputToStream()
    00181         {
    00182           _pxmlConv->OutputToStream();
    00183         }
    00184
    00187       virtual int SkipObjects(int n, OBConversion* pConv)
    00188         {
    00189           //don't implement on base class
    00190           if(*EndTag()=='>')
    00191             return 0;
    00192
    00193           //Set up XMLConversion class with reader
    00194           _pxmlConv = XMLConversion::GetDerived(pConv,true);
    00195           if(!_pxmlConv)
    00196             return -1;
    00197
    00198           //always find the end of at least 1 object
    00199           if(n==0)++n;
    00200
    00201           //Skip n objects, returning -1 if not successful
    00202           int i;
    00203           for(i=0; i<n; ++i)
    00204             if(_pxmlConv->SkipXML(EndTag())!=1)
    00205               return -1;
    00206
    00207           return 1;
    00208         }
    00209
    00210     };
    00211
    00212   //*************************************************
    00215   class XMLMoleculeFormat : public XMLBaseFormat
    00216     {
    00217     protected:
    00218       OBMol* _pmol;
    00219
    00220     public:
    00221       ~XMLMoleculeFormat(){}
    00222       virtual bool ReadChemObject(OBConversion* pConv)
    00223         {
    00224           return OBMoleculeFormat::ReadChemObjectImpl(pConv, this);
    00225         };
    00226
    00227       virtual bool WriteChemObject(OBConversion* pConv)
    00228         {
    00229           return OBMoleculeFormat::WriteChemObjectImpl(pConv, this);
    00230         };
    00231
    00232       virtual bool ReadMolecule(OBBase* pOb, OBConversion* pConv)
    00233         {
    00234           _pmol = dynamic_cast<OBMol*>(pOb);
    00235           if(!_pmol)
    00236             return false;
    00237           _pxmlConv = XMLConversion::GetDerived(pConv,true);
    00238           if(!_pxmlConv)
    00239             return false;
    00240           _embedlevel = -1;
    00241           return _pxmlConv->ReadXML(this,pOb);
    00242         };
    00243
    00244       const std::type_info& GetType()
    00245         {
    00246           return typeid(OBMol*);
    00247         };
    00248
    00249     };
    00250
    00251
    00252 }//namespace
    00253
    00257
    00258 #endif

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