/**
* Copyright (C) 2001-3, Anthony Harrison anh23@pitt.edu This library 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 2.1 of the License, or (at your option) any later version.
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.jactr.core.module.procedural.six;
import org.jactr.core.production.IProduction;
import org.jactr.core.production.six.ISubsymbolicProduction6;
/*
* sorts descending based on current expected Gain
*/
/**
* Description of the Class
*
* @author harrison
* @created April 18, 2003
*/
public class ProductionUtilityComparator implements
java.util.Comparator<IProduction>
{
/**
* slightly different comparator.
*/
public int compare(IProduction one, IProduction two)
{
if (one == two) return 0;
ISubsymbolicProduction6 sp1 = (ISubsymbolicProduction6) one
.getSubsymbolicProduction();
ISubsymbolicProduction6 sp2 = (ISubsymbolicProduction6) two
.getSubsymbolicProduction();
double base1 = sp1.getExpectedUtility();
double base2 = sp2.getExpectedUtility();
/*
* if utility learning is not on, we will only have the utility value to
* work with, not expected.
*/
if (Double.isNaN(base1)) base1 = sp1.getUtility();
if (Double.isNaN(base2)) base2 = sp1.getUtility();
if (base1 == base2)
return 0;
else if (base1 < base2) return 1;
return -1;
}
/**
* Description of the Method
*
* @param one
* Description of the Parameter
* @return Description of the Return Value
*/
@Override
public boolean equals(Object one)
{
return false;
}
}