attrrefs.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 __ATTRREFS_H__
#define __ATTRREFS_H__

BEGIN_NAMESPACE( classad )


class AttributeReference : public ExprTree 
{
        public:

        AttributeReference(const AttributeReference &ref);

        ~AttributeReference ();

        AttributeReference &operator=(const AttributeReference &ref);

        static AttributeReference *MakeAttributeReference(ExprTree *expr, 
                                        const std::string &attrName, bool absolute=false);

                void GetComponents( ExprTree *&expr,std::string &attr, bool &abs ) const;

                virtual ExprTree* Copy( ) const;

        bool CopyFrom(const AttributeReference &ref);

        virtual bool SameAs(const ExprTree *tree) const;

        friend bool operator==(const AttributeReference &ref1, const AttributeReference &ref2);

        protected:
        AttributeReference ();

        private:
                // private ctor for internal use
                AttributeReference( ExprTree*, const std::string &, bool );
                virtual void _SetParentScope( const ClassAd* p );
        virtual bool _Evaluate( EvalState & , Value & ) const;
        virtual bool _Evaluate( EvalState & , Value &, ExprTree*& ) const;
        virtual bool _Flatten( EvalState&, Value&, ExprTree*&, int* ) const;
                int     FindExpr( EvalState&, ExprTree*&, ExprTree*&, bool ) const;

                ExprTree        *expr;
                bool            absolute;
        std::string attributeStr;
};

END_NAMESPACE // classad

#endif//__ATTRREFS_H__