Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.common / src / org / simantics / db / common / request / IsParent.java

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/IsParent.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/IsParent.java
new file mode 100644 (file)
index 0000000..5c2a073
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/IsParent.java
@@ -0,0 +1,41 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.db.common.request;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.layer0.Layer0;\r
+\r
+/**\r
+ * @author Antti Villberg\r
+ */\r
+public class IsParent extends ResourceRead2<Boolean> {\r
+\r
+    public IsParent(Resource possibleParent, Resource possibleChild) {\r
+        super(possibleParent, possibleChild);\r
+    }\r
+\r
+    @Override\r
+    public Boolean perform(ReadGraph graph) throws DatabaseException {\r
+       \r
+       if(resource.equals(resource2)) return true;\r
+       \r
+       Layer0 L0 = Layer0.getInstance(graph);\r
+       Resource parent = graph.getPossibleObject(resource2, L0.PartOf);\r
+       if(parent == null) return false;\r
+       \r
+       return graph.sync(new IsParent(resource, parent));\r
+       \r
+    }\r
+\r
+}\r