IVariableBuilder.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;

import org.lightjason.agentspeak.agent.IAgent;
import org.lightjason.agentspeak.language.instantiable.IInstantiable;
import org.lightjason.agentspeak.language.variable.IVariable;

import java.util.function.BiFunction;
import java.util.stream.Stream;


/**
 * interface for a variable builder which is
 * called on each plan / rule execution
 *
 * @warning returning variable can be manipulate direct by the agent and generation must be thread-safe
 */
public interface IVariableBuilder extends BiFunction<IAgent<?>, IInstantiable, Stream<IVariable<?>>>
{
    /**
     * empty variable builder
     */
    IVariableBuilder EMPTY = ( p_agent, p_runningcontext ) -> Stream.empty();

}