package org.drools.examples.conway.rules.dsl;
import org.drools.examples.conway.Cell;
import org.drools.rule.Declaration;
import org.drools.spi.Tuple;
import org.drools.spi.Condition;
/**
* @author <a href="mailto:brown_j@ociweb.com">Jeff Brown</a>
* @version $Id: RipeForBirthCondition.java,v 1.2 2005/05/16 23:31:19 brownj Exp $
*/
public class RipeForBirthCondition implements Condition
{
protected final Declaration cellDeclaration;
public RipeForBirthCondition( Declaration cellDeclaration)
{
this.cellDeclaration = cellDeclaration;
}
/**
* Determine if the supplied <code>Tuple</code> is allowed by this
* condition.
*
* @param tuple
* The <code>Tuple</code> to test.
*
* @return <code>true</code> if the <code>Tuple</code> passes this
* condition, else <code>false</code>.
*
*/
public boolean isAllowed(Tuple tuple)
{
Cell cell = (Cell) tuple.get( cellDeclaration );
int numberOfLiveNeighborsCellHas = cell.getNumberOfLiveNeighbors();
boolean isAllowed = ( numberOfLiveNeighborsCellHas == 3 );
return isAllowed;
}
/**
* Retrieve the array of <code>Declaration</code> s required by this
* condition to perform its duties.
*
* @return The array of <code>Declarations</code> expected on incoming
* <code>Tuples</code>.
*/
public Declaration[] getRequiredTupleMembers()
{
return new Declaration[]{cellDeclaration};
}
}