1 files changed, 95 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/indexer/GroupBasedMessageIndexer.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/indexer/GroupBasedMessageIndexer.java
new file mode 100644
index 00000000..80271252
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/indexer/GroupBasedMessageIndexer.java
@@ -0,0 +1,95 @@
+/*******************************************************************************
+ * 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();
+        }
+
+}