CValueConstraint.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.                                    #
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 * # 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.                                #
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 * # 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/                  #
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package org.lightjason.agentspeak.action.builtin.math.linearprogram;

import org.apache.commons.lang3.tuple.Pair;
import org.apache.commons.math3.optim.linear.LinearConstraint;
import org.apache.commons.math3.optim.linear.LinearObjectiveFunction;
import org.lightjason.agentspeak.language.CCommon;
import org.lightjason.agentspeak.language.ITerm;
import org.lightjason.agentspeak.language.execution.IContext;
import org.lightjason.agentspeak.language.fuzzy.CFuzzyValue;
import org.lightjason.agentspeak.language.fuzzy.IFuzzyValue;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;


public final class CValueConstraint extends IConstraint
{
    private static final long serialVersionUID = 2316665584839205362L;

    @Nonnegative
    @Override
    public final int minimalArgumentNumber()
    {
        return 4;
    }

    @Nonnull
    @Override
    public final IFuzzyValue<Boolean> execute( final boolean p_parallel, @Nonnull final IContext p_context,
                                               @Nonnull final List<ITerm> p_argument, @Nonnull final List<ITerm> p_return )
    {
        final List<ITerm> l_arguments = CCommon.flatten( p_argument ).collect( Collectors.toList() );

        // create linear constraint based on a value
        l_arguments.get( 0 ).<Pair<LinearObjectiveFunction, Collection<LinearConstraint>>>raw().getRight().add(
            new LinearConstraint(
                l_arguments.stream()
                           .limit( l_arguments.size() - 2 )
                           .skip( 1 )
                           .mapToDouble( i -> i.<Number>raw().doubleValue() )
                           .toArray(),
                this.getRelation( l_arguments.get( l_arguments.size() - 2 ).<String>raw() ),
                l_arguments.get( l_arguments.size() - 1 ).<Number>raw().doubleValue()
            )
        );

        return CFuzzyValue.from( true );
    }

}