/*******************************************************************************
* Copyright 2012-2015 Analog Devices, 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.
********************************************************************************/
package com.analog.lyric.dimple.solvers.gibbs;
import static java.util.Objects.*;
import java.util.Collection;
import org.eclipse.jdt.annotation.Nullable;
import com.analog.lyric.dimple.exceptions.DimpleException;
import com.analog.lyric.dimple.model.core.EdgeState;
import com.analog.lyric.dimple.model.repeated.BlastFromThePastFactor;
import com.analog.lyric.dimple.model.values.DiscreteValue;
import com.analog.lyric.dimple.model.values.IndexedValue;
import com.analog.lyric.dimple.model.values.Value;
import com.analog.lyric.dimple.model.variables.Discrete;
import com.analog.lyric.dimple.model.variables.Variable;
import com.analog.lyric.dimple.solvers.core.SBlastFromThePast;
/**
* @since 0.07
*/
public class GibbsTableFactorBlastFromThePast extends SBlastFromThePast implements ISolverFactorGibbs
{
private boolean _visited = false;
private int _topologicalOrder = 0;
public GibbsTableFactorBlastFromThePast(BlastFromThePastFactor f, GibbsSolverGraph parent)
{
super(f, parent);
}
@Override
public GibbsSolverEdge<?> createEdge(EdgeState edge)
{
return new GibbsDiscreteEdge((Discrete)edge.getVariable(getFactor().requireParentGraph()));
}
@Override
public GibbsSolverGraph getParentGraph()
{
return (GibbsSolverGraph)_parent;
}
@Override
public GibbsDiscrete getSibling(int edge)
{
return (GibbsDiscrete)super.getSibling(edge);
}
@Override
public Value getInputMsg(int portIndex)
{
final GibbsSolverGraph sgraph = requireNonNull(getParentGraph());
final GibbsDiscrete svar = sgraph.getDiscrete((Discrete)_portForOtherVar.getNode());
return svar.getPrevSampleValue();
}
@SuppressWarnings("null")
@Override
public double getPotential()
{
final GibbsSolverGraph sgraph = getParentGraph();
final GibbsDiscrete svar = (GibbsDiscrete)sgraph.getSolverVariable((Variable)_portForOtherVar.getNode());
final DiscreteValue inputMsg = svar.getPrevSampleValue();
final GibbsDiscreteEdge sedge = svar.getDiscreteEdge(_portForOtherVar.getSiblingNumber());
return sedge.factorToVarMsg.getEnergy(inputMsg.getIndex());
}
@Override
public final int getTopologicalOrder()
{
return _topologicalOrder ;
}
@Override
public final void setTopologicalOrder(int order)
{
_topologicalOrder = order;
}
@Override
public void updateNeighborVariableValue(int variableIndex, Value oldValue)
{
throw DimpleException.unsupportedMethod(getClass(), "updateNeighborVariableValue");
}
@Override
public void updateNeighborVariableValuesNow(@Nullable Collection<IndexedValue> oldValue)
{
throw DimpleException.unsupportedMethod(getClass(), "updateNeighborVariableValuesNow");
}
@Override
public void updateEdgeMessage(EdgeState modelEdge, GibbsSolverEdge<?> solverEdge)
{
//NOP
}
@Override
public boolean setVisited(boolean visited)
{
boolean changed = _visited ^ visited;
_visited = visited;
return changed;
}
}