edu.oregonstate.eecs.mcplan.domains.yahtzee2.KeepAction.java Source code

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Here is the source code for edu.oregonstate.eecs.mcplan.domains.yahtzee2.KeepAction.java

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/* LICENSE
Copyright (c) 2013-2016, Jesse Hostetler (jessehostetler@gmail.com)
All rights reserved.
    
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    
1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
    
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/**
 * 
 */
package edu.oregonstate.eecs.mcplan.domains.yahtzee2;

import java.util.Arrays;

import org.apache.commons.math3.random.RandomGenerator;

import edu.oregonstate.eecs.mcplan.util.Csv;
import edu.oregonstate.eecs.mcplan.util.Fn;

/**
 * Keep one or more dice, and re-roll the others.
 * 
 * @author jhostetler
 */
public class KeepAction extends YahtzeeAction {
    public final int[] keepers;
    public final int Nkeepers;

    private Hand old_hand_ = null;

    public KeepAction(final int[] keepers) {
        this.keepers = keepers;
        Nkeepers = Fn.sum(keepers);
        assert (Nkeepers >= 0);
        // Note: This assertion breaks a heuristic method for excluding
        // the "keep everything" action (see: YahtzeeActionGenerator ctor).
        //      assert( Nkeepers < Hand.Ndice );
    }

    @Override
    public KeepAction create() {
        return new KeepAction(keepers);
    }

    @Override
    public void undoAction(final YahtzeeState s) {
        assert (old_hand_ != null);
        s.setHand(old_hand_, s.rerolls + 1);
        old_hand_ = null;
    }

    @Override
    public void doAction(final RandomGenerator rng, final YahtzeeState s) {
        assert (old_hand_ == null);
        assert (s.rerolls > 0);
        old_hand_ = s.hand();

        final int[] r = s.roll(rng, Hand.Ndice - Nkeepers);
        Fn.vplus_inplace(r, keepers);
        final Hand h = new Hand(r);
        s.setHand(h, s.rerolls - 1);
    }

    @Override
    public boolean isDone() {
        return old_hand_ != null;
    }

    @Override
    public String toString() {
        return "KeepAction(" + Csv.encode(keepers) + ")";
    }

    @Override
    public boolean equals(final Object obj) {
        if (obj == null || !(obj instanceof KeepAction)) {
            return false;
        }
        final KeepAction that = (KeepAction) obj;
        return Arrays.equals(keepers, that.keepers);
    }

    @Override
    public int hashCode() {
        return 5 * Arrays.hashCode(keepers);
    }

}