classadItor.h

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you
 * may not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 ***************************************************************/


#ifndef __CLASSAD_CLASSAD_ITOR_H__
#define __CLASSAD_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_CLASSAD_ITOR_H__