CMaxIndex.java

  1. /*
  2.  * @cond LICENSE
  3.  * ######################################################################################
  4.  * # LGPL License                                                                       #
  5.  * #                                                                                    #
  6.  * # This file is part of the LightJason AgentSpeak(L++)                                #
  7.  * # Copyright (c) 2015-19, LightJason (info@lightjason.org)                            #
  8.  * # This program is free software: you can redistribute it and/or modify               #
  9.  * # it under the terms of the GNU Lesser General Public License as                     #
  10.  * # published by the Free Software Foundation, either version 3 of the                 #
  11.  * # License, or (at your option) any later version.                                    #
  12.  * #                                                                                    #
  13.  * # This program is distributed in the hope that it will be useful,                    #
  14.  * # but WITHOUT ANY WARRANTY; without even the implied warranty of                     #
  15.  * # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                      #
  16.  * # GNU Lesser General Public License for more details.                                #
  17.  * #                                                                                    #
  18.  * # You should have received a copy of the GNU Lesser General Public License           #
  19.  * # along with this program. If not, see http://www.gnu.org/licenses/                  #
  20.  * ######################################################################################
  21.  * @endcond
  22.  */

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

  24. import org.lightjason.agentspeak.action.builtin.IBuiltinAction;
  25. import org.lightjason.agentspeak.error.CRuntimeException;
  26. import org.lightjason.agentspeak.language.CCommon;
  27. import org.lightjason.agentspeak.language.CRawTerm;
  28. import org.lightjason.agentspeak.language.ITerm;
  29. import org.lightjason.agentspeak.language.execution.IContext;
  30. import org.lightjason.agentspeak.language.fuzzy.CFuzzyValue;
  31. import org.lightjason.agentspeak.language.fuzzy.IFuzzyValue;

  32. import javax.annotation.Nonnegative;
  33. import javax.annotation.Nonnull;
  34. import java.util.List;
  35. import java.util.stream.Collectors;
  36. import java.util.stream.IntStream;


  37. /**
  38.  * action for index of maximum.
  39.  * The action takes of the given unflatten input the maximum and
  40.  * returns the index within the unflatten argument list, the
  41.  * action never fails
  42.  *
  43.  * {@code MaxIndex = math/maxindex( 5, 6, [7,8, [1,2,3]] );}
  44.  */
  45. public final class CMaxIndex extends IBuiltinAction
  46. {
  47.     /**
  48.      * serial id
  49.      */
  50.     private static final long serialVersionUID = 3532214759609690631L;

  51.     @Nonnegative
  52.     @Override
  53.     public final int minimalArgumentNumber()
  54.     {
  55.         return 1;
  56.     }

  57.     @Nonnull
  58.     @Override
  59.     public final IFuzzyValue<Boolean> execute( final boolean p_parallel, @Nonnull final IContext p_context,
  60.                                                @Nonnull final List<ITerm> p_argument, @Nonnull final List<ITerm> p_return )
  61.     {
  62.         final List<Double> l_list = CCommon.flatten( p_argument )
  63.                                            .map( ITerm::<Number>raw )
  64.                                            .mapToDouble( Number::doubleValue )
  65.                                            .boxed()
  66.                                            .collect( Collectors.toList() );

  67.         p_return.add(
  68.             CRawTerm.from(
  69.                 (double) IntStream.range( 0, l_list.size() )
  70.                                 .parallel()
  71.                                 .reduce( ( i, j ) -> l_list.get( i ) < l_list.get( j ) ? j : i )
  72.                                 .orElseThrow( () -> new CRuntimeException( p_context ) )
  73.             )
  74.         );

  75.         return CFuzzyValue.from( true );
  76.     }
  77. }