CTanh.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.                                    #
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 * # This program is distributed in the hope that it will be useful,                    #
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 * # along with this program. If not, see http://www.gnu.org/licenses/                  #
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 * @endcond
 */

package org.lightjason.agentspeak.action.builtin.math;

import org.lightjason.agentspeak.action.builtin.IBuiltinAction;
import org.lightjason.agentspeak.language.CCommon;
import org.lightjason.agentspeak.language.CRawTerm;
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.List;


/**
 * action for tangens hyperbolic value.
 * Calculates for each unflatten argument
 * \f$ tanh( x_i ) \f$ and fails never
 *
 * {@code [A|B|C] = math/tanh( [1,2], 3 );}
 * @see https://en.wikipedia.org/wiki/Hyperbolic_function
 */
public final class CTanh extends IBuiltinAction
{
    /**
     * serial id
     */
    private static final long serialVersionUID = -5713238239330397757L;

    @Nonnegative
    @Override
    public final int minimalArgumentNumber()
    {
        return 1;
    }

    @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 )
    {
        CCommon.flatten( p_argument )
               .map( ITerm::<Number>raw )
               .mapToDouble( Number::doubleValue )
               .boxed()
               .map( Math::tanh )
               .map( CRawTerm::from )
               .forEach( p_return::add );

        return CFuzzyValue.from( true );
    }

}