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query.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 __QUERY_H__
#define __QUERY_H__

#include <vector>
#include <list>
#include <string>

BEGIN_NAMESPACE( classad )

class ClassAdCollection;
class ExprTree;
class ClassAd;

class LocalCollectionQuery {
public:
      LocalCollectionQuery( );
      ~LocalCollectionQuery( );

      void Bind( ClassAdCollection * );
      bool Query( const std::string &viewName, ExprTree *constraint=NULL, 
                bool two_way_matching = false);
      void Clear( );

      void ToFirst(void);
      bool IsAtFirst( ) const { return( itr==keys.begin( ) ); }
      bool Current( std::string &key );
      bool Next( std::string &key );
      bool Prev( std::string &key );
      void ToAfterLast(void);
      bool IsAfterLast(void) const { return( itr==keys.end( ) ); }

      typedef std::vector<std::string>::iterator iterator;
      typedef std::vector<std::string>::const_iterator const_iterator;

      iterator begin()              { return keys.begin(); }
      const_iterator begin() const  { return keys.begin(); }
      iterator end()                { return keys.end(); }
      const_iterator end() const    { return keys.end(); }

private:
      ClassAdCollection                   *collection;
      std::vector<std::string>            keys;
      std::vector<std::string>::iterator  itr;
};


END_NAMESPACE // classad

#endif


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