1 files changed, 112 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/ExtendToEStructuralFeatureSource.java b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/ExtendToEStructuralFeatureSource.java
new file mode 100644
index 00000000..04f0a8de
--- /dev/null
+++ b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/ExtendToEStructuralFeatureSource.java
@@ -0,0 +1,112 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2013, Zoltan Ujhelyi, Akos Horvath, 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.localsearch.operations.extend;
+
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+import java.util.function.Function;
+import java.util.stream.StreamSupport;
+
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.EStructuralFeature;
+import tools.refinery.viatra.runtime.emf.types.EStructuralFeatureInstancesKey;
+import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
+import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
+import tools.refinery.viatra.runtime.localsearch.operations.IIteratingSearchOperation;
+import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
+import tools.refinery.viatra.runtime.matchers.context.IInputKey;
+import tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContext;
+import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
+import tools.refinery.viatra.runtime.matchers.tuple.VolatileMaskedTuple;
+
+/**
+ * Iterates over all sources of {@link EStructuralFeature} using an {@link IQueryRuntimeContext VIATRA Base indexer}.
+ * It is assumed that the indexer is initialized for the selected {@link EStructuralFeature}.
+ * 
+ */
+public class ExtendToEStructuralFeatureSource implements IIteratingSearchOperation {
+
+    private class Executor extends SingleValueExtendOperationExecutor<EObject> {
+        
+        private VolatileMaskedTuple maskedTuple;
+        
+        public Executor(int position) {
+            super(position);
+            this.maskedTuple = new VolatileMaskedTuple(mask);
+        }
+
+        
+        @Override
+        public Iterator<EObject> getIterator(MatchingFrame frame, ISearchContext context) {
+            maskedTuple.updateTuple(frame);
+            Iterable<? extends Object> values = context.getRuntimeContext().enumerateValues(type, indexerMask, maskedTuple);
+            return StreamSupport.stream(values.spliterator(), false)
+                    .filter(EObject.class::isInstance)
+                    .map(EObject.class::cast)
+                    .iterator();
+        }
+        
+        @Override
+        public ISearchOperation getOperation() {
+            return ExtendToEStructuralFeatureSource.this;
+        }
+    }
+    
+    private final int sourcePosition;
+    private final int targetPosition;
+    private final EStructuralFeature feature;
+    private final IInputKey type;
+    private static final TupleMask indexerMask = TupleMask.fromSelectedIndices(2, new int[] {1});
+    private final TupleMask mask;
+    
+    /**
+     * @since 1.7
+     */
+    public ExtendToEStructuralFeatureSource(int sourcePosition, int targetPosition, EStructuralFeature feature, TupleMask mask) {
+        this.sourcePosition = sourcePosition;
+        this.targetPosition = targetPosition;
+        this.feature = feature;
+        this.mask = mask;
+        this.type = new EStructuralFeatureInstancesKey(feature);
+    }
+
+    public EStructuralFeature getFeature() {
+        return feature;
+    }
+    
+    @Override
+    public ISearchOperationExecutor createExecutor() {
+        return new Executor(sourcePosition);
+    }
+
+    @Override
+    public String toString() {
+        return toString(Object::toString);
+    }
+    
+    @Override
+    public String toString(Function<Integer, String> variableMapping) {
+        return "extend    "+feature.getContainerClass().getSimpleName()+"."+feature.getName()+"(-"+variableMapping.apply(sourcePosition)+", +"+variableMapping.apply(targetPosition)+") indexed";
+    }
+
+    @Override
+    public List<Integer> getVariablePositions() {
+        return Arrays.asList(sourcePosition, targetPosition);
+    }
+    
+    /**
+     * @since 1.4
+     */
+    @Override
+    public IInputKey getIteratedInputKey() {
+        return type;
+    }
+    
+}