package org.drools.common;
import org.drools.FactException;
import org.drools.beliefsystem.BeliefSet;
import org.drools.core.util.LinkedList;
import org.drools.core.util.LinkedListEntry;
import org.drools.rule.Rule;
import org.drools.spi.Activation;
import org.drools.spi.PropagationContext;
public class TruthMaintenanceSystemHelper {
public static void removeLogicalDependencies(final InternalFactHandle handle, final PropagationContext propagationContext ) throws FactException {
final BeliefSet beliefSet = handle.getEqualityKey().getBeliefSet();
if ( beliefSet != null && !beliefSet.isEmpty() ) {
beliefSet.cancel(propagationContext);
}
}
public static void clearLogicalDependencies(final InternalFactHandle handle, final PropagationContext propagationContext ) throws FactException {
final BeliefSet beliefSet = handle.getEqualityKey().getBeliefSet();
if ( beliefSet != null && !beliefSet.isEmpty() ) {
beliefSet.clear(propagationContext);
}
}
public static void removeLogicalDependencies(final Activation activation,
final PropagationContext context,
final Rule rule) throws FactException {
final LinkedList<LogicalDependency> list = activation.getLogicalDependencies();
if ( list == null || list.isEmpty() ) {
return;
}
for ( LogicalDependency node = list.getFirst(); node != null; node = node.getNext() ) {
removeLogicalDependency( node, context );
}
activation.setLogicalDependencies( null );
}
public static void removeLogicalDependency(final LogicalDependency node,
final PropagationContext context) {
final BeliefSet beliefSet = ( BeliefSet ) node.getJustified();
beliefSet.getBeliefSystem().delete( node, beliefSet, context );
}
}