PropertyMatchExpression.hpp

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/* 
 * PropertyMatchExpression.hpp 
 *
 * This file is part of the Chemical Data Processing Toolkit
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_CHEM_PROPERTYMATCHEXPRESSION_HPP
#define CDPL_CHEM_PROPERTYMATCHEXPRESSION_HPP
 
#include <functional>
 
#include "CDPL/Chem/MatchExpression.hpp"
 
 
namespace CDPL
{
 
    namespace Chem
    {
 
        template <typename ValueType, typename MatchFunc, typename ObjType1, typename ObjType2 = void>
        class PropertyMatchExpression : public MatchExpression<ObjType1, ObjType2>
        {
 
          public:
            typedef std::shared_ptr<PropertyMatchExpression> SharedPointer;
 
            typedef std::function<ValueType(const ObjType1&, const ObjType2&)> PropertyFunction;
 
            PropertyMatchExpression(const PropertyFunction& property_func):
                value(), matchFunc(), propertyFunc(property_func), fixed(false) {}
 
            PropertyMatchExpression(const ValueType& value, const PropertyFunction& property_func):
                value(value), matchFunc(), propertyFunc(property_func), fixed(true) {}
 
            bool operator()(const ObjType1& query_obj1, const ObjType2& query_obj2, const ObjType1& target_obj1,
                            const ObjType2& target_obj2, const Base::Any& aux_data) const;
 
          private:
            ValueType        value;
            MatchFunc        matchFunc;
            PropertyFunction propertyFunc;
            bool             fixed;
        };
 
        template <typename ValueType, typename MatchFunc, typename ObjType>
        class PropertyMatchExpression<ValueType, MatchFunc, ObjType, void> : public MatchExpression<ObjType, void>
        {
 
          public:
            typedef std::shared_ptr<PropertyMatchExpression> SharedPointer;
 
            typedef std::function<ValueType(const ObjType&)> PropertyFunction;
 
            PropertyMatchExpression(const PropertyFunction& property_func):
                value(), matchFunc(), propertyFunc(property_func), fixed(false) {}
 
            PropertyMatchExpression(const ValueType& value, const PropertyFunction& property_func):
                value(value), matchFunc(), propertyFunc(property_func), fixed(true) {}
 
            bool operator()(const ObjType& query_obj, const ObjType& target_obj, const Base::Any& aux_data) const;
 
          private:
            ValueType        value;
            MatchFunc        matchFunc;
            PropertyFunction propertyFunc;
            bool             fixed;
        };
    } // namespace Chem
} // namespace CDPL
 
 
// Implementation
 
template <typename ValueType, typename MatchFunc, typename ObjType1, typename ObjType2>
bool CDPL::Chem::PropertyMatchExpression<ValueType, MatchFunc, ObjType1, ObjType2>::operator()(const ObjType1& query_obj1, const ObjType2& query_obj2,
                                                                                               const ObjType1& target_obj1, const ObjType2& target_obj2,
                                                                                               const Base::Any&) const
{
    if (fixed)
        return matchFunc(propertyFunc(target_obj1, target_obj2), value);
 
    return matchFunc(propertyFunc(target_obj1, target_obj2), propertyFunc(query_obj1, query_obj2));
}
 
 
template <typename ValueType, typename MatchFunc, typename ObjType>
bool CDPL::Chem::PropertyMatchExpression<ValueType, MatchFunc, ObjType, void>::operator()(const ObjType& query_obj, const ObjType& target_obj,
                                                                                          const Base::Any&) const
{
    if (fixed)
        return matchFunc(propertyFunc(target_obj), value);
 
    return matchFunc(propertyFunc(target_obj), propertyFunc(query_obj));
}
 
#endif // CDPL_CHEM_PROPERTYMATCHEXPRESSION_HPP