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/*******************************************************************************
* Copyright (c) 2004-2008 Gabor Bergmann and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.rete.single;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.util.Direction;
import tools.refinery.viatra.runtime.matchers.util.timeline.Timeline;
import tools.refinery.viatra.runtime.rete.network.ReteContainer;
import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
/**
* This node implements a simple filter. A stateless abstract check() predicate determines whether a matching is allowed
* to pass.
*
* @author Gabor Bergmann
*
*/
public abstract class FilterNode extends SingleInputNode {
public FilterNode(final ReteContainer reteContainer) {
super(reteContainer);
}
/**
* Abstract filtering predicate. Expected to be stateless.
*
* @param ps
* the matching to be checked.
* @return true if and only if the parameter matching is allowed to pass through this node.
*/
public abstract boolean check(final Tuple ps);
@Override
public void pullInto(final Collection<Tuple> collector, final boolean flush) {
for (final Tuple ps : this.reteContainer.pullPropagatedContents(this, flush)) {
if (check(ps)) {
collector.add(ps);
}
}
}
@Override
public void pullIntoWithTimeline(Map<Tuple, Timeline<Timestamp>> collector, boolean flush) {
for (final Entry<Tuple, Timeline<Timestamp>> entry : this.reteContainer.pullPropagatedContentsWithTimestamp(this, flush).entrySet()) {
if (check(entry.getKey())) {
collector.put(entry.getKey(), entry.getValue());
}
}
}
@Override
public void update(final Direction direction, final Tuple updateElement, final Timestamp timestamp) {
if (check(updateElement)) {
propagateUpdate(direction, updateElement, timestamp);
}
}
}
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