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/*******************************************************************************
* Copyright (c) 2004-2009 Gabor Bergmann and Daniel Varro
* Copyright (c) 2024 The Refinery Authors <https://refinery.tools/>
* 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.interpreter.rete.aggregation;
import tools.refinery.interpreter.matchers.tuple.ITuple;
import tools.refinery.interpreter.matchers.tuple.Tuple;
import tools.refinery.interpreter.matchers.tuple.TupleMask;
import tools.refinery.interpreter.matchers.tuple.Tuples;
import tools.refinery.interpreter.matchers.util.Direction;
import tools.refinery.interpreter.matchers.util.timeline.Timeline;
import tools.refinery.interpreter.rete.index.DefaultIndexerListener;
import tools.refinery.interpreter.rete.index.Indexer;
import tools.refinery.interpreter.rete.index.ProjectionIndexer;
import tools.refinery.interpreter.rete.index.StandardIndexer;
import tools.refinery.interpreter.rete.network.Node;
import tools.refinery.interpreter.rete.network.ReteContainer;
import tools.refinery.interpreter.rete.network.StandardNode;
import tools.refinery.interpreter.rete.network.communication.Timestamp;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class LeftJoinNode extends StandardNode {
private final Object defaultValue;
private ProjectionIndexer projectionIndexer;
private TupleMask projectionMask;
private boolean leftInheritanceOutputMask;
private OuterIndexer outerIndexer = null;
public LeftJoinNode(ReteContainer reteContainer, Object defaultValue) {
super(reteContainer);
this.defaultValue = defaultValue;
}
@Override
public void networkStructureChanged() {
if (reteContainer.isTimelyEvaluation() && reteContainer.getCommunicationTracker().isInRecursiveGroup(this)) {
throw new IllegalStateException(this + " cannot be used in recursive differential dataflow evaluation!");
}
super.networkStructureChanged();
}
public void initializeWith(ProjectionIndexer projectionIndexer) {
this.projectionIndexer = projectionIndexer;
projectionMask = projectionIndexer.getMask();
leftInheritanceOutputMask = isLeftInheritanceOutputMask(projectionMask);
projectionIndexer.attachListener(new DefaultIndexerListener(this) {
@Override
public void notifyIndexerUpdate(Direction direction, Tuple updateElement, Tuple signature, boolean change,
Timestamp timestamp) {
update(direction, updateElement, signature, change, timestamp);
}
});
}
private static boolean isLeftInheritanceOutputMask(TupleMask mask) {
int size = mask.getSize();
int sourceWidth = mask.getSourceWidth();
if (size != sourceWidth - 1) {
throw new IllegalArgumentException("projectionMask should omit a single index, got " + mask);
}
int[] repetitions = new int[sourceWidth];
for (int i = 0; i < size; i++) {
int index = mask.indices[i];
int repetition = repetitions[index] + 1;
if (repetition >= 2) {
throw new IllegalArgumentException("Repeated index %d in projectionMask %s".formatted(index, mask));
}
repetitions[index] = repetition;
}
for (int i = 0; i < size; i++) {
int index = mask.indices[i];
if (index != i) {
return false;
}
}
return true;
}
protected void update(Direction direction, Tuple updateElement, Tuple signature, boolean change,
Timestamp timestamp) {
propagateUpdate(direction, updateElement, timestamp);
if (outerIndexer != null) {
outerIndexer.update(direction, updateElement, signature, change, timestamp);
}
}
protected Tuple getDefaultTuple(ITuple key) {
if (leftInheritanceOutputMask) {
return Tuples.staticArityFlatTupleOf(key, defaultValue);
}
var objects = new Object[projectionMask.sourceWidth];
int targetLength = projectionMask.indices.length;
for (int i = 0; i < targetLength; i++) {
int j = projectionMask.indices[i];
objects[j] = key.get(j);
}
return Tuples.flatTupleOf(objects);
}
@Override
public void pullInto(Collection<Tuple> collector, boolean flush) {
projectionIndexer.getParent().pullInto(collector, flush);
}
@Override
public void pullIntoWithTimeline(Map<Tuple, Timeline<Timestamp>> collector, boolean flush) {
projectionIndexer.getParent().pullIntoWithTimeline(collector, flush);
}
@Override
public Set<Tuple> getPulledContents(boolean flush) {
return projectionIndexer.getParent().getPulledContents(flush);
}
public Indexer getOuterIndexer() {
if (outerIndexer == null) {
outerIndexer = new OuterIndexer();
getCommunicationTracker().registerDependency(this, outerIndexer);
}
return outerIndexer;
}
/**
* A special non-iterable index that retrieves the aggregated, packed result (signature+aggregate) for the original
* signature.
*
* @author Gabor Bergmann
*/
class OuterIndexer extends StandardIndexer {
public OuterIndexer() {
super(LeftJoinNode.this.reteContainer, LeftJoinNode.this.projectionMask);
this.parent = LeftJoinNode.this;
}
@Override
public Collection<Tuple> get(Tuple signature) {
var collection = projectionIndexer.get(signature);
if (collection == null || collection.isEmpty()) {
return List.of(getDefaultTuple(signature));
}
return collection;
}
public void update(Direction direction, Tuple updateElement, Tuple signature, boolean change,
Timestamp timestamp) {
propagate(direction, updateElement, signature, false, timestamp);
if (change) {
var defaultTuple = getDefaultTuple(signature);
propagate(direction.opposite(), defaultTuple, signature, false, timestamp);
}
}
@Override
public Node getActiveNode() {
return projectionIndexer.getActiveNode();
}
}
}
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