1 files changed, 121 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/TransitiveClosureNodeIndexer.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/TransitiveClosureNodeIndexer.java
new file mode 100644
index 00000000..77202004
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/TransitiveClosureNodeIndexer.java
@@ -0,0 +1,121 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2012, Tamas Szabo, Gabor Bergmann, 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.index;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.Set;
+
+import tools.refinery.viatra.runtime.rete.itc.alg.incscc.IncSCCAlg;
+import tools.refinery.viatra.runtime.matchers.tuple.MaskedTuple;
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
+import tools.refinery.viatra.runtime.matchers.tuple.Tuples;
+import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
+import tools.refinery.viatra.runtime.matchers.util.Direction;
+import tools.refinery.viatra.runtime.rete.network.Receiver;
+import tools.refinery.viatra.runtime.rete.single.TransitiveClosureNode;
+
+// UNFINISHED, not used yet
+public class TransitiveClosureNodeIndexer extends StandardIndexer implements IterableIndexer {
+    private TransitiveClosureNode tcNode;
+    private IncSCCAlg<Object> tcAlg;
+    private Collection<Tuple> emptySet;
+
+    public TransitiveClosureNodeIndexer(TupleMask mask, IncSCCAlg<Object> tcAlg, TransitiveClosureNode tcNode) {
+        super(tcNode.getContainer(), mask);
+        this.tcAlg = tcAlg;
+        this.tcNode = tcNode;
+        this.emptySet = Collections.emptySet();
+        this.parent = tcNode;
+    }
+
+    @Override
+    public Collection<Tuple> get(Tuple signature) {
+        if (signature.getSize() == mask.sourceWidth) {
+            if (mask.indices.length == 0) {
+                // mask ()/2
+                return getSignatures();
+            } else if (mask.indices.length == 1) {
+                Set<Tuple> retSet = CollectionsFactory.createSet();
+
+                // mask (0)/2
+                if (mask.indices[0] == 0) {
+                    Object source = signature.get(0);
+                    for (Object target : tcAlg.getAllReachableTargets(source)) {
+                        retSet.add(Tuples.staticArityFlatTupleOf(source, target));
+                    }
+                    return retSet;
+                }
+                // mask (1)/2
+                if (mask.indices[0] == 1) {
+                    Object target = signature.get(1);
+                    for (Object source : tcAlg.getAllReachableSources(target)) {
+                        retSet.add(Tuples.staticArityFlatTupleOf(source, target));
+                    }
+                    return retSet;
+                }
+            } else {
+                // mask (0,1)/2
+                if (mask.indices[0] == 0 && mask.indices[1] == 1) {
+                    Object source = signature.get(0);
+                    Object target = signature.get(1);
+                    Tuple singleton = Tuples.staticArityFlatTupleOf(source, target);
+                    return (tcAlg.isReachable(source, target) ? Collections.singleton(singleton) : emptySet);
+                }
+                // mask (1,0)/2
+                if (mask.indices[0] == 1 && mask.indices[1] == 0) {
+                    Object source = signature.get(1);
+                    Object target = signature.get(0);
+                    Tuple singleton = Tuples.staticArityFlatTupleOf(source, target);
+                    return (tcAlg.isReachable(source, target) ? Collections.singleton(singleton) : emptySet);
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public int getBucketCount() {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public Collection<Tuple> getSignatures() {
+        return asTupleCollection(tcAlg.getTcRelation());
+    }
+
+    @Override
+    public Iterator<Tuple> iterator() {
+        return asTupleCollection(tcAlg.getTcRelation()).iterator();
+    }
+
+    private Collection<Tuple> asTupleCollection(
+            Collection<tools.refinery.viatra.runtime.rete.itc.alg.misc.Tuple<Object>> tuples) {
+        Set<Tuple> retSet = CollectionsFactory.createSet();
+        for (tools.refinery.viatra.runtime.rete.itc.alg.misc.Tuple<Object> tuple : tuples) {
+            retSet.add(Tuples.staticArityFlatTupleOf(tuple.getSource(), tuple.getTarget()));
+        }
+        return retSet;
+    }
+
+    /**
+     * @since 2.4
+     */
+    public void propagate(Direction direction, Tuple updateElement, boolean change) {
+        propagate(direction, updateElement, new MaskedTuple(updateElement, mask), change, null);
+    }
+
+    @Override
+    public Receiver getActiveNode() {
+        return tcNode;
+    }
+
+}