attrrefs.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_ATTRREFS_H__
#define __CLASSAD_ATTRREFS_H__

BEGIN_NAMESPACE( classad )


class AttributeReference : public ExprTree 
{
    public:

        AttributeReference(const AttributeReference &ref);

        virtual ~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//__CLASSAD_ATTRREFS_H__