/Users/green/Documents/workspace/DavisDB_public/FileScanOperator.h

/*
 *  FileScanOperator.h
 *  DavisDB
 *
 *  Created by Mingmin Chen on 5/6/10.
 *  Copyright 2010 UCD. All rights reserved.
 *
 */


#ifndef FILESCANOPERATOR_H_
#define FILESCANOPERATOR_H_

#include "IQueryOperator.h"

struct Condition;

class FileScanOperator : public IQueryOperator {
public:
        FileScanOperator(const char* relation, int nAttributes, 
                                 const RelationAttributeInfo attributes[]);
        FileScanOperator();
        virtual ~FileScanOperator();
        ReturnCode openExecution();
        ReturnCode closeExecution();
        ReturnCode getNextRecord(Record* record);
        int getArity();
        void getSchema(RelationAttributeInfo attributes[]) ;
        void printSubtree(int indent);

private:
        RelationAttributeInfo* attributes_;
        char* relation_;
        int nAttributes_;
        uint recordSize_;
        RecordManager* rm_;
        RecordFileHandle* rfh_;
        RecordFileScan rfs_;
};

#endif  // FILESCANOPERATOR_H_

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