metaDataRestrictionInterface.hpp

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/*
 * Copyright (c) 2014 Patrick P. Frey
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
#ifndef _STRUS_METADATA_RESTRICTION_INTERFACE_HPP_INCLUDED
#define _STRUS_METADATA_RESTRICTION_INTERFACE_HPP_INCLUDED
#include "strus/numericVariant.hpp"
#include "strus/index.hpp"
#include <string>

namespace strus {

class MetaDataRestrictionInstanceInterface;

class MetaDataRestrictionInterface
{
public:
        virtual ~MetaDataRestrictionInterface()
        {}

        enum CompareOperator
        {
                CompareLess,            
                CompareLessEqual,       
                CompareEqual,           
                CompareNotEqual,        
                CompareGreater,         
                CompareGreaterEqual     
        };
        enum {NofCompareOperators=((int)CompareGreaterEqual+1)};

        static const char* compareOperatorStr( CompareOperator op)
        {
                static const char* ar[] = {"<","<=","==","!=",">",">=",0};
                return ar[ (int)op];
        }
        static const char* compareOperatorName( CompareOperator op)
        {
                static const char* ar[] = {"lt","le","eq","ne","gt","ge",0};
                return ar[ (int)op];
        }

        virtual void addCondition(
                        const CompareOperator& opr,
                        const std::string& name,
                        const NumericVariant& operand,
                        bool newGroup=true)=0;

        virtual MetaDataRestrictionInstanceInterface* createInstance() const=0;

        virtual std::string tostring() const=0;
};

} //namespace
#endif