1 files changed, 48 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-base/src/main/java/tools/refinery/viatra/runtime/base/api/FeatureListener.java b/subprojects/viatra-runtime-base/src/main/java/tools/refinery/viatra/runtime/base/api/FeatureListener.java
new file mode 100644
index 00000000..fa2d679e
--- /dev/null
+++ b/subprojects/viatra-runtime-base/src/main/java/tools/refinery/viatra/runtime/base/api/FeatureListener.java
@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * 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.base.api;
+
+import org.eclipse.emf.ecore.EAttribute;
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.ecore.EReference;
+import org.eclipse.emf.ecore.EStructuralFeature;
+
+/**
+ * Interface for observing insertion and deletion of structural feature values ("settings"). (Works both for
+ * single-valued and many-valued features.)
+ * 
+ * @author Tamas Szabo
+ * 
+ */
+public interface FeatureListener {
+
+    /**
+     * Called when the given value is inserted into the given feature of the given host EObject.
+     * 
+     * @param host
+     *            the host (holder) of the feature
+     * @param feature
+     *            the {@link EAttribute} or {@link EReference} instance
+     * @param value
+     *            the target of the feature
+     */
+    public void featureInserted(EObject host, EStructuralFeature feature, Object value);
+
+    /**
+     * Called when the given value is removed from the given feature of the given host EObject.
+     * 
+     * @param host
+     *            the host (holder) of the feature
+     * @param feature
+     *            the {@link EAttribute} or {@link EReference} instance
+     * @param value
+     *            the target of the feature
+     */
+    public void featureDeleted(EObject host, EStructuralFeature feature, Object value);
+}