/*
* Encog(tm) Core v3.4 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2016 Heaton Research, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* For more information on Heaton Research copyrights, licenses
* and trademarks visit:
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*/
package org.encog.ml.world.grid.probability;
import java.util.Set;
import java.util.TreeSet;
import org.encog.ml.world.Action;
import org.encog.ml.world.State;
import org.encog.ml.world.SuccessorState;
import org.encog.ml.world.WorldError;
import org.encog.ml.world.grid.GridState;
import org.encog.ml.world.grid.GridWorld;
public class GridDeterministicProbability extends GridAbstractProbability {
public GridDeterministicProbability(GridWorld theWorld) {
super(theWorld);
}
@Override
public double calculate(State resultState, State previousState, Action desiredAction) {
if( !(resultState instanceof GridState) || !(previousState instanceof GridState) ) {
throw new WorldError("Must be instance of GridState");
}
GridState gridResultState = (GridState)resultState;
GridState gridPreviousState = (GridState)previousState;
Action resultingAction = determineResultingAction(gridPreviousState, gridResultState);
GridState desiredState = determineActionState(gridPreviousState,desiredAction);
// are we trying to move nowhere
if( gridResultState==gridPreviousState ) {
if( GridWorld.isStateBlocked(desiredState) )
return 1.0;
else
return 0.0;
}
if( resultingAction!=null )
return 1.0;
else
return 0.0;
}
@Override
public Set<SuccessorState> determineSuccessorStates(State state,
Action action) {
Set<SuccessorState> result = new TreeSet<SuccessorState>();
if(action!=null) {
State newState = determineActionState((GridState)state, action);
result.add(new SuccessorState(newState,1.0));
}
return result;
}
}