CEquationConstraint.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.                                #
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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 com.codepoetics.protonpack.StreamUtils;
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 CEquationConstraint extends IConstraint
{
    private static final long serialVersionUID = 3123101079239668634L;


    @Nonnegative
    @Override
    public final int minimalArgumentNumber()
    {
        return 6;
    }

    @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 left-hand-side and right-hand-side with operator lists
        final List<Number> l_lhs = StreamUtils.takeWhile( l_arguments.stream().skip( 1 ), i -> !CCommon.rawvalueAssignableTo( i, String.class ) )
                                              .map( ITerm::<Number>raw )
                                              .collect( Collectors.toList() );

        final List<ITerm> l_rhs = l_arguments.stream()
                                             .skip( l_lhs.size() + 1 )
                                             .collect( Collectors.toList() );

        // test content
        if ( ( l_lhs.size() < 2 ) || ( l_rhs.size() < 3 ) || ( !CCommon.rawvalueAssignableTo( l_rhs.get( 0 ), String.class ) ) )
            return CFuzzyValue.from( false );

        // create constraint
        l_arguments.get( 0 ).<Pair<LinearObjectiveFunction, Collection<LinearConstraint>>>raw().getRight().add(
            new LinearConstraint(

                // c_i values
                l_lhs.stream()
                     .limit( l_lhs.size() - 1 )
                     .mapToDouble( Number::doubleValue )
                     .toArray(),

                // c_const value
                l_lhs.get( l_lhs.size() - 1 )
                     .doubleValue(),

                // relation symbol
                this.getRelation( l_rhs.get( 0 ).<String>raw() ),

                // r_i values
                l_rhs.stream()
                     .limit( l_rhs.size() - 1 )
                     .skip( 1 )
                     .map( ITerm::<Number>raw )
                     .mapToDouble( Number::doubleValue )
                     .toArray(),

                // r_const value
                l_rhs.get( l_rhs.size() - 1 )
                     .<Number>raw()
                     .doubleValue()

            )
        );

        return CFuzzyValue.from( true );
    }

}