CBeliefList.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.action.builtin.agent;

import org.lightjason.agentspeak.action.builtin.IBuiltinAction;
import org.lightjason.agentspeak.common.CPath;
import org.lightjason.agentspeak.language.CRawTerm;
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.util.Collections;
import java.util.List;
import java.util.stream.Collectors;


/**
 * returns a list of all belief literals.
 * The action creates a list of literals,
 * the arguments are optional, the first
 * argument is a boolean for the negation
 * definition, the second argument is the
 * belief functor, if no arguments are give,
 * the full belieflist is returned
 *
 * {@code L = agent/belieflist( true, "path/subpath/literalfunctor" );}
 *
 */
public final class CBeliefList extends IBuiltinAction
{
    /**
     * serial id
     */
    private static final long serialVersionUID = 6884092740048107959L;

    @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<ILiteral> l_literal = (
            p_argument.isEmpty()
            ? p_context.agent().beliefbase().stream()
            : p_argument.size() == 1
              ? p_context.agent().beliefbase().stream( CPath.from( p_argument.get( 0 ).<String>raw() ) )
              : p_context.agent().beliefbase().stream( p_argument.get( 1 ).<Boolean>raw(), CPath.from( p_argument.get( 0 ).<String>raw() ) )
        ).collect( Collectors.toList() );

        p_return.add(
            CRawTerm.from( p_parallel
                           ? Collections.synchronizedList( l_literal )
                           : l_literal
            )
        );

        return CFuzzyValue.from( true );
    }

}