1 files changed, 54 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/nobase/AbstractIteratingExtendOperationExecutor.java b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/nobase/AbstractIteratingExtendOperationExecutor.java
new file mode 100644
index 00000000..954d4c88
--- /dev/null
+++ b/subprojects/viatra-runtime-localsearch/src/main/java/tools/refinery/viatra/runtime/localsearch/operations/extend/nobase/AbstractIteratingExtendOperationExecutor.java
@@ -0,0 +1,54 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Grill Balázs, IncQuery Labs Ltd.
+ * 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.nobase;
+
+import java.util.Collections;
+import java.util.Spliterator;
+import java.util.Spliterators;
+import java.util.stream.Stream;
+import java.util.stream.StreamSupport;
+
+import org.eclipse.emf.common.notify.Notifier;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.resource.Resource;
+import org.eclipse.emf.ecore.resource.ResourceSet;
+import tools.refinery.viatra.runtime.emf.EMFScope;
+import tools.refinery.viatra.runtime.localsearch.operations.extend.SingleValueExtendOperationExecutor;
+
+/**
+ * This abstract class provides a utility method for extenders to iterate over the given scope.
+ * 
+ * @author Grill Balázs
+ * @noextend This class is not intended to be subclassed by clients.
+ *
+ */
+abstract class AbstractIteratingExtendOperationExecutor<T> extends SingleValueExtendOperationExecutor<T> {
+
+    private final EMFScope scope;
+    
+    public AbstractIteratingExtendOperationExecutor(int position, EMFScope scope) {
+        super(position);
+        this.scope = scope;
+    }
+    
+    protected Stream<Notifier> getModelContents() {
+        return scope.getScopeRoots().stream().map(input -> {
+            if (input instanceof ResourceSet) {
+                return ((ResourceSet) input).getAllContents();
+            } else if (input instanceof Resource) {
+                return ((Resource) input).getAllContents();
+            } else if (input instanceof EObject) {
+                return ((EObject) input).eAllContents();
+            }
+            return Collections.<Notifier> emptyIterator();
+        }).map(i -> StreamSupport.stream(Spliterators.spliteratorUnknownSize(i, Spliterator.ORDERED), false))
+                .flatMap(i -> i);
+    }
+
+}