CBeliefAction.java

/*
 * @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.execution.action;

import org.lightjason.agentspeak.common.CCommon;
import org.lightjason.agentspeak.language.ILiteral;
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.Nonnull;
import java.text.MessageFormat;
import java.util.List;


/**
 * belief action
 */
public final class CBeliefAction extends IBaseExecution<ILiteral>
{
    /**
     * serial id
     */
    private static final long serialVersionUID = -2856258502338708361L;
    /**
     * running action
     */
    private final EAction m_action;

    /**
     * ctor
     *
     * @param p_literal literal
     * @param p_action action
     */
    public CBeliefAction( @Nonnull final ILiteral p_literal, @Nonnull final EAction p_action )
    {
        super( p_literal );
        m_action = p_action;
    }

    @Override
    public final String toString()
    {
        return MessageFormat.format( "{0}{1}", m_action, m_value );
    }

    @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 )
    {
        switch ( m_action )
        {
            case ADD:
                p_context.agent().beliefbase().add( m_value.unify( p_context ) );
                break;

            case DELETE:
                p_context.agent().beliefbase().remove( m_value.unify( p_context ) );
                break;

            default:
                throw new IllegalArgumentException( CCommon.languagestring( this, "unknownaction", m_action ) );
        }

        return CFuzzyValue.from( true );
    }

    /**
     * belief action definition
     */
    public enum EAction
    {
        ADD( "+" ),
        DELETE( "-" );
        /**
         * name
         */
        private final String m_name;

        /**
         * ctor
         *
         * @param p_name string represenation
         */
        EAction( @Nonnull final String p_name )
        {
            m_name = p_name;
        }

        @Override
        public final String toString()
        {
            return m_name;
        }
    }
}