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/*******************************************************************************
* Copyright (c) 2010-2018, Tamas Szabo, Istvan Rath 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.network.indexer;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
/**
* @author Tamas Szabo
* @since 2.0
*/
public class GroupBasedMessageIndexer implements MessageIndexer {
protected final Map<Tuple, DefaultMessageIndexer> indexer;
protected final TupleMask groupMask;
public GroupBasedMessageIndexer(final TupleMask groupMask) {
this.indexer = CollectionsFactory.createMap();
this.groupMask = groupMask;
}
public Map<Tuple, Integer> getTuplesByGroup(final Tuple group) {
final DefaultMessageIndexer values = this.indexer.get(group);
if (values == null) {
return Collections.emptyMap();
} else {
return Collections.unmodifiableMap(values.getTuples());
}
}
@Override
public int getCount(final Tuple update) {
final Tuple group = this.groupMask.transform(update);
final Integer count = getTuplesByGroup(group).get(update);
if (count == null) {
return 0;
} else {
return count;
}
}
public Set<Tuple> getGroups() {
return Collections.unmodifiableSet(this.indexer.keySet());
}
@Override
public void insert(final Tuple update) {
update(update, 1);
}
@Override
public void delete(final Tuple update) {
update(update, -1);
}
@Override
public void update(final Tuple update, final int delta) {
final Tuple group = this.groupMask.transform(update);
DefaultMessageIndexer valueIndexer = this.indexer.get(group);
if (valueIndexer == null) {
valueIndexer = new DefaultMessageIndexer();
this.indexer.put(group, valueIndexer);
}
valueIndexer.update(update, delta);
// it may happen that the indexer becomes empty as a result of the update
if (valueIndexer.isEmpty()) {
this.indexer.remove(group);
}
}
@Override
public boolean isEmpty() {
return this.indexer.isEmpty();
}
@Override
public void clear() {
this.indexer.clear();
}
}
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