+/*******************************************************************************\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.browsing.ui.graph.impl;\r
+\r
+import java.util.Collection;\r
+\r
+import org.simantics.browsing.ui.BuiltinKeys;\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
+import org.simantics.browsing.ui.BuiltinKeys.ViewpointKey;\r
+import org.simantics.browsing.ui.content.Viewpoint;\r
+import org.simantics.browsing.ui.content.ViewpointFactory;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.exception.DatabaseException;\r
+\r
+public abstract class GraphViewpointFactory implements ViewpointFactory {\r
+\r
+ @Override\r
+ public Viewpoint create(PrimitiveQueryUpdater updater,\r
+ NodeContext context, ViewpointKey key) {\r
+ assert(updater != null);\r
+ assert(context != null);\r
+\r
+ return new LazyViewpoint(updater, context, key) {\r
+ @Override\r
+ public NodeContext[] children(ReadGraph graph) throws DatabaseException {\r
+ return toContextsWithInput(GraphViewpointFactory.this.\r
+ getChildren(graph, (Resource) context.getConstant(BuiltinKeys.INPUT)));\r
+ }\r
+\r
+ @Override\r
+ public Boolean hasChildren(ReadGraph graph) throws DatabaseException {\r
+ return children(graph).length > 0;\r
+ }\r
+\r
+ @Override\r
+ public String toString() {\r
+ return GraphViewpointFactory.this.toString();\r
+ }\r
+\r
+ @Override\r
+ public Object getIdentity() {\r
+ return GraphViewpointFactory.this.getClass();\r
+ }\r
+\r
+ };\r
+ }\r
+\r
+ abstract protected Collection<?> getChildren(ReadGraph g, Resource r) throws DatabaseException;\r
+ protected boolean hasChildren(ReadGraph g, Resource r) throws DatabaseException {\r
+ return !getChildren(g, r).isEmpty();\r
+ }\r
+\r
+}\r