X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.modeling%2Fsrc%2Forg%2Fsimantics%2Fmodeling%2Fadapters%2FReferenceElementRemover.java;fp=bundles%2Forg.simantics.modeling%2Fsrc%2Forg%2Fsimantics%2Fmodeling%2Fadapters%2FReferenceElementRemover.java;h=513e368afeba5edffc760ec63779ce73987c53a6;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.modeling/src/org/simantics/modeling/adapters/ReferenceElementRemover.java b/bundles/org.simantics.modeling/src/org/simantics/modeling/adapters/ReferenceElementRemover.java
new file mode 100644
index 000000000..513e368af
--- /dev/null
+++ b/bundles/org.simantics.modeling/src/org/simantics/modeling/adapters/ReferenceElementRemover.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Semantum Oy - initial API and implementation
+ *******************************************************************************/
+package org.simantics.modeling.adapters;
+
+import org.simantics.db.Resource;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.modeling.ModelingResources;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class ReferenceElementRemover extends ElementRemover {
+
+    public ReferenceElementRemover(Resource referenceElement) {
+        super(referenceElement);
+    }
+
+    @Override
+    public void remove(WriteGraph graph) throws DatabaseException {
+        ModelingResources MOD = ModelingResources.getInstance(graph);
+
+        Resource referencedComponent = graph.getPossibleObject(resource, MOD.HasParentComponent);
+        Resource referenceRelation = graph.getPossibleObject(resource, MOD.HasReferenceRelation);
+        //System.out.println("references component : " + NameUtils.getSafeName(graph, referencedComponent));
+        //System.out.println("reference relation: " + NameUtils.getSafeName(graph, referenceRelation));
+
+        if (referencedComponent != null && referenceRelation != null) {
+            // Make sure that all referenceRelations from parentComponent are
+            // removed since removing this reference element will also remove
+            // the referenceRelation which would break the statements into
+            // unusable form if the relation was still used anywhere.
+            graph.deny(referencedComponent, referenceRelation);
+        }
+
+        // Only after successfully denying all uses of referenceRelation
+        // can we delete the reference element itself.
+        super.remove(graph);
+    }
+
+}