1 files changed, 90 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/IterateOverChildren.java b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/IterateOverChildren.java
new file mode 100644
index 00000000..10764aea
--- /dev/null
+++ b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/IterateOverChildren.java
@@ -0,0 +1,90 @@
+/*******************************************************************************
+ * 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 org.eclipse.emf.ecore.EObject;
+import tools.refinery.viatra.runtime.localsearch.MatchingFrame;
+import tools.refinery.viatra.runtime.localsearch.matcher.ISearchContext;
+import tools.refinery.viatra.runtime.localsearch.operations.ISearchOperation;
+import tools.refinery.viatra.runtime.matchers.util.Preconditions;
+
+/**
+ * Iterates all child elements of a selected EObjects. 
+ * 
+ * @author Zoltan Ujhelyi
+ * 
+ */
+public class IterateOverChildren implements ISearchOperation {
+
+    private class Executor extends SingleValueExtendOperationExecutor<EObject> {
+        
+        public Executor(int position) {
+            super(position);
+        }
+
+        @Override
+        public Iterator<EObject> getIterator(MatchingFrame frame, ISearchContext context) {
+            Preconditions.checkState(frame.get(sourcePosition) instanceof EObject, "Only children of EObject elements are supported.");
+            EObject source = (EObject) frame.get(sourcePosition);
+            if(transitive) {
+                return source.eAllContents();
+            } else {
+                return source.eContents().iterator();
+            }
+        }
+        
+        @Override
+        public ISearchOperation getOperation() {
+            return IterateOverChildren.this;
+        }
+    }
+
+    private final int position;
+    private int sourcePosition;
+    private final boolean transitive;
+
+    /**
+     * 
+     * @param position the position of the variable storing the child elements
+     * @param sourcePosition the position of the variable storing the parent root; must be bound
+     * @param transitive if true, child elements are iterated over transitively
+     */
+    public IterateOverChildren(int position, int sourcePosition, boolean transitive) {
+        this.position = position;
+        this.sourcePosition = sourcePosition;
+        this.transitive = transitive;
+    }
+
+    @Override
+    public String toString() {
+        return toString(Object::toString);
+    }
+    
+    @Override
+    public String toString(Function<Integer, String> variableMapping) {
+        return "extend    containment +"+variableMapping.apply(sourcePosition)+" <>--> -"+variableMapping.apply(position)+(transitive ? " transitively" : " directly");
+    }
+    
+    @Override
+    public ISearchOperationExecutor createExecutor() {
+        return new Executor(position);
+    }
+
+
+    @Override
+    public List<Integer> getVariablePositions() {
+        return Arrays.asList(position, sourcePosition);
+    }
+
+}
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