Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.browsing.ui.graph.impl / src / org / simantics / browsing / ui / graph / impl / RelatedObjectsQueryProcessor.java

diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/RelatedObjectsQueryProcessor.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/RelatedObjectsQueryProcessor.java
new file mode 100644 (file)
index 0000000..c41e029
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/RelatedObjectsQueryProcessor.java
@@ -0,0 +1,76 @@
+/*******************************************************************************\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
+import java.util.Collections;\r
+\r
+import org.eclipse.core.runtime.IAdaptable;\r
+import org.simantics.browsing.ui.BuiltinKeys;\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.NodeContext.PrimitiveQueryKey;\r
+import org.simantics.browsing.ui.graph.impl.CommonKeys.RelatedObjectsKey;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.utils.Container;\r
+\r
+/**\r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class RelatedObjectsQueryProcessor extends LazyGraphQueryProcessor<Collection<Resource>> {\r
+\r
+    @Override\r
+    public String toString() {\r
+        return "RelatedObjectsProcessor";\r
+    }\r
+\r
+    @Override\r
+    public Object getIdentifier() {\r
+        return CommonKeys.RelatedObjectsKey.class;\r
+    }\r
+\r
+    @Override\r
+    protected Collection<Resource> initial() {\r
+        return Collections.emptySet();\r
+    }\r
+\r
+    @Override\r
+    protected Collection<Resource> compute(ReadGraph graph, NodeContext context, PrimitiveQueryKey<Container<Collection<Resource>>> key) throws DatabaseException {\r
+        Object input = context.getConstant(BuiltinKeys.INPUT);\r
+        Resource subject = adaptToSingle(input, Resource.class);\r
+\r
+        RelatedObjectsKey k = (RelatedObjectsKey) key;\r
+        final Resource relation = k.getParameter(0);\r
+        if (relation == null)\r
+            return Collections.emptyList();\r
+\r
+        return graph.getObjects(subject, relation);\r
+    }\r
+\r
+    @SuppressWarnings("unchecked")\r
+    public static <T> T adaptToSingle(Object o, Class<T> clazz) {\r
+        if (clazz.isInstance(o)) {\r
+            return (T) o;\r
+        } else if (o instanceof IAdaptable) {\r
+            IAdaptable a = (IAdaptable) o;\r
+            return (T) a.getAdapter(clazz);\r
+        } else if (o instanceof Container<?>) {\r
+            Object obj = ((Container<?>) o).get();\r
+            if (obj == o)\r
+                return null;\r
+            return adaptToSingle(obj, clazz);\r
+        }\r
+        return null;\r
+    }\r
+\r
+}\r