Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/PossibleIndexRoot.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/PossibleIndexRoot.java
new file mode 100644 (file)
index 0000000..930375c
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/PossibleIndexRoot.java
@@ -0,0 +1,62 @@
+/*******************************************************************************\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 java.util.Collection;\r
+import java.util.HashSet;\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
+public class PossibleIndexRoot extends ResourceRead<Resource> {\r
+\r
+    public PossibleIndexRoot(Resource resource) {\r
+        super(resource);\r
+    }\r
+\r
+    @Override\r
+    public Resource perform(ReadGraph graph) throws DatabaseException {\r
+\r
+       Layer0 L0 = Layer0.getInstance(graph);\r
+       \r
+        if (graph.isInstanceOf(resource, L0.IndexRoot))\r
+            return resource;\r
+        \r
+        Collection<Resource> parents = new HashSet<Resource>(graph.getObjects(resource, L0.IsOwnedBy));\r
+        Resource parent = parents.size() == 1 ? parents.iterator().next() : null;\r
+\r
+        // What is this?\r
+        if(resource.equals(parent))\r
+               parent = null;\r
+\r
+        if (parent == null) {\r
+               \r
+               if(parents.size() > 1) {\r
+                       // Maybe we have a case where there is ConsistsOf and HasProperty that is incorrectly classified as IsComposedOf\r
+                       parent = graph.getPossibleObject(resource, L0.PartOf);\r
+               } \r
+\r
+               // Assertion object?\r
+               if(parent == null)\r
+                       parent = graph.getPossibleObject(resource, L0.HasObjectInverse);\r
+               \r
+               if(parent == null) return null;\r
+               \r
+        }\r
+        \r
+        return graph.syncRequest(new PossibleIndexRoot(parent));\r
+\r
+    }\r
+\r
+}\r