IUnifier.java

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/*
 * @cond LICENSE
 * ######################################################################################
 * # LGPL License                                                                       #
 * #                                                                                    #
 * # This file is part of the LightJason AgentSpeak(L++)                                #
 * # Copyright (c) 2015-19, LightJason (info@lightjason.org)                            #
 * # This program 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 3 of the                 #
 * # License, or (at your option) any later version.                                    #
 * #                                                                                    #
 * # This program 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 program. If not, see http://www.gnu.org/licenses/                  #
 * ######################################################################################
 * @endcond
 */

package org.lightjason.agentspeak.language.unify;

import org.lightjason.agentspeak.language.ILiteral;
import org.lightjason.agentspeak.language.ITerm;
import org.lightjason.agentspeak.language.execution.IContext;
import org.lightjason.agentspeak.language.execution.expression.IExpression;
import org.lightjason.agentspeak.language.fuzzy.CFuzzyValue;
import org.lightjason.agentspeak.language.fuzzy.IFuzzyValue;
import org.lightjason.agentspeak.language.variable.IVariable;

import javax.annotation.Nonnull;
import java.util.Collections;
import java.util.Set;
import java.util.stream.Stream;


public interface IUnifier
{
    IUnifier EMPTY = new IUnifier()
    {
        @Nonnull
        @Override
        public final Set<IVariable<?>> unify( @Nonnull final ILiteral p_source, @Nonnull final ILiteral p_target )
        {
            return Collections.emptySet();
        }

        @Nonnull
        @Override
        public final IFuzzyValue<Boolean> unify( @Nonnull final IContext p_context, @Nonnull final ILiteral p_literal, final long p_variables,
                                                 @Nonnull final IExpression p_expression, final boolean p_parallel )
        {
            return CFuzzyValue.from( false );
        }
    };


    @Nonnull
    Set<IVariable<?>> unify( @Nonnull final ILiteral p_source, @Nonnull final ILiteral p_target );

    @Nonnull
    IFuzzyValue<Boolean> unify( @Nonnull final IContext p_context, @Nonnull final ILiteral p_literal, final long p_variables,
                                @Nonnull final IExpression p_expression, final boolean p_parallel );


    interface IAlgorithm
    {

        <T extends ITerm> boolean unify( final Set<IVariable<?>> p_variables, final Stream<T> p_source, final Stream<T> p_target );

    }

}