classadItor.h

/*********************************************************************
 *
 * Condor ClassAd library
 * Copyright (C) 1990-2003, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI and Rajesh Raman.
 *
 * This source code is covered by the Condor Public License, which can
 * be found in the accompanying LICENSE file, or online at
 * www.condorproject.org.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * AND THE UNIVERSITY OF WISCONSIN-MADISON "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY, OF SATISFACTORY QUALITY, AND FITNESS
 * FOR A PARTICULAR PURPOSE OR USE ARE DISCLAIMED. THE COPYRIGHT
 * HOLDERS AND CONTRIBUTORS AND THE UNIVERSITY OF WISCONSIN-MADISON
 * MAKE NO MAKE NO REPRESENTATION THAT THE SOFTWARE, MODIFICATIONS,
 * ENHANCEMENTS OR DERIVATIVE WORKS THEREOF, WILL NOT INFRINGE ANY
 * PATENT, COPYRIGHT, TRADEMARK, TRADE SECRET OR OTHER PROPRIETARY
 * RIGHT.
 *
 *********************************************************************/

#ifndef __CLASSAD_ITOR_H__
#define __CLASSAD_ITOR_H__

BEGIN_NAMESPACE( classad )








class ClassAdIterator
{
    public:
        ClassAdIterator() { ad = NULL; }

        ClassAdIterator(const ClassAd &ca) { ad=&ca; ToFirst( ); }

        ~ClassAdIterator(){ }

        inline void Initialize(const ClassAd &ca){ ad=&ca; ToFirst( ); }

        inline void ToFirst () { if(ad) itr = ad->attrList.begin( ); }

        inline void ToAfterLast ()  { if(ad) itr = ad->attrList.end( ); }

        bool NextAttribute( std::string& attr, const ExprTree*& expr );

        bool CurrentAttribute( std::string& attr, const ExprTree*& expr ) const;

        inline bool IsAtFirst() const {
                        return(ad?(itr==ad->attrList.begin()):false);
                }

        inline bool IsAfterLast() const {
                        return(ad?(itr==ad->attrList.end()):false); 
                }

    private:
                AttrList::const_iterator        itr;
        const ClassAd                           *ad;
};

END_NAMESPACE // classad

#endif//CLASSAD_ITOR