Enhancements to UC migration.

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / request / ChildrenByIdentifier.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ChildrenByIdentifier.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ChildrenByIdentifier.java
new file mode 100644 (file)
index 0000000..8b3c076
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/ChildrenByIdentifier.java
@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.layer0.request;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.simantics.datatypes.literal.GUID;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.common.request.ResourceRead;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.layer0.Layer0;
+
+/**
+ * Get a map from GUIDs to the children of the given resource.
+ */
+public final class ChildrenByIdentifier extends ResourceRead<Map<GUID, Resource>> {
+       public ChildrenByIdentifier(Resource resource) {
+               super(resource);
+       }
+
+       @Override
+       public Map<GUID, Resource> perform(ReadGraph graph) throws DatabaseException {
+               Map<GUID, Resource> result = new HashMap<>();
+               Layer0 L0 = Layer0.getInstance(graph);
+               Collection<Resource> children = graph.getObjects(resource, L0.ConsistsOf);
+               for (Resource child : children) {
+                       GUID guid = graph.getPossibleRelatedValue(child, L0.identifier, GUID.BINDING);
+                       if (guid != null)
+                               result.put(guid, child);
+               }
+               
+               return result;
+       }
+}