--- /dev/null
+/*******************************************************************************\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.contribution;\r
+\r
+import java.util.Collection;\r
+\r
+import org.simantics.browsing.ui.BuiltinKeys;\r
+import org.simantics.browsing.ui.DataSource;\r
+import org.simantics.browsing.ui.NodeContext;\r
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;\r
+import org.simantics.browsing.ui.Tester;\r
+import org.simantics.browsing.ui.content.ViewpointContribution;\r
+import org.simantics.browsing.ui.graph.impl.request.ResourceQuery;\r
+import org.simantics.db.AsyncReadGraph;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.procedure.Listener;\r
+import org.simantics.db.procedure.Procedure;\r
+import org.simantics.utils.ui.ErrorLogger;\r
+\r
+/**\r
+ * Implement {@link #children(AsyncReadGraph)} and {@link #hasChildren(AsyncReadGraph)}.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+abstract public class FinalViewpointContributionImpl extends ContributionStub implements GraphContribution {\r
+\r
+ final private ResourceQuery<Collection<NodeContext>> childQuery;\r
+ final private Procedure<Collection<NodeContext>> childProcedure;\r
+\r
+ final protected PrimitiveQueryUpdater updater;\r
+ final private NodeContext context;\r
+ final private BuiltinKeys.ViewpointContributionKey key;\r
+\r
+ /**\r
+ * This identity is used to give the back-end graph requests a\r
+ * <em>properly unique</em> identity that so that the graph back-end caching\r
+ * and graph explorer node context caching work together properly.\r
+ * \r
+ * Consider having two graph explorer instances that have the same\r
+ * configuration (same evaluators) and are showing the same resource from\r
+ * the graph database. In this case the requests are actually meant to have\r
+ * an identical identity and performing the graph request will simply bind a\r
+ * new listener for the one and same request.\r
+ * \r
+ * @return an additional identity for graph back-end requests to make them\r
+ * properly unique\r
+ */\r
+ public Object getIdentity() {\r
+ return key;\r
+ }\r
+\r
+ public FinalViewpointContributionImpl(final PrimitiveQueryUpdater updater, NodeContext context, BuiltinKeys.ViewpointContributionKey key) {\r
+\r
+ assert updater != null;\r
+ assert context != null;\r
+ assert key != null;\r
+\r
+ this.updater = updater;\r
+ this.context = context;\r
+ this.key = key;\r
+\r
+ this.childQuery = new ResourceQuery<Collection<NodeContext>>(getIdentity(), context) {\r
+\r
+ @Override\r
+ public Collection<NodeContext> perform(ReadGraph graph) throws DatabaseException {\r
+ try {\r
+ // Make sure that null is not returned.\r
+ Collection<NodeContext> result = children(graph, context);\r
+ if (result == null)\r
+ throw new NullPointerException("LazyContributionImpl.children is not allowed to return null, but " + FinalViewpointContributionImpl.this.getClass() + " just did it");\r
+ return result;\r
+ } catch (DatabaseException e) {\r
+ throw e;\r
+ } catch (Throwable t) {\r
+ ErrorLogger.defaultLogError("LazyContributionImpl.childQuery produced unexpected exception.", t);\r
+ return ViewpointContribution.NO_CONTRIBUTION;\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public String toString() {\r
+ return "LazyContributionImpl[" + System.identityHashCode(FinalViewpointContributionImpl.this) + "].childQuery";\r
+ }\r
+\r
+ };\r
+\r
+ childProcedure = createProcedure();\r
+ \r
+ }\r
+ \r
+ protected Procedure<Collection<NodeContext>> createProcedure() {\r
+\r
+ return new Procedure<Collection<NodeContext>>() {\r
+\r
+ @Override\r
+ public void execute(Collection<NodeContext> result) {\r
+ replaceChildrenResult(result);\r
+ }\r
+\r
+ public void exception(Throwable t) {\r
+ ErrorLogger.defaultLogError("LazyContributionImpl.childQuery failed, see exception for details.", t);\r
+ }\r
+\r
+ @Override\r
+ public String toString() {\r
+ return "LazyContributionImpl[" + System.identityHashCode(FinalViewpointContributionImpl.this) + "].childProcedure";\r
+ }\r
+\r
+ };\r
+ \r
+ }\r
+\r
+ public NodeContext getContext() {\r
+ return context;\r
+ }\r
+\r
+ @Override\r
+ public Collection<NodeContext> getContribution() {\r
+\r
+ //System.out.println("LazyViewpoint2@" + System.identityHashCode(this) + " getChildren() = " + children.length);\r
+\r
+ if (children == org.simantics.browsing.ui.content.ViewpointContribution.PENDING_CONTRIBUTION) {\r
+ DataSource<ReadGraph> source = updater.getDataSource(ReadGraph.class);\r
+ if (source != null) {\r
+ source.schedule(graph -> {\r
+ if(childProcedure instanceof Listener<?>)\r
+ graph.asyncRequest(childQuery, (Listener<Collection<NodeContext>>)childProcedure);\r
+ else \r
+ graph.asyncRequest(childQuery, childProcedure);\r
+ });\r
+ }\r
+ }\r
+\r
+ //System.out.println("LazyViewpoint.getChildren returns " + children);\r
+\r
+ return children;\r
+\r
+ }\r
+\r
+ protected void replaceChildrenResult(Collection<NodeContext> result) {\r
+ setChildren(updater, result);\r
+ updater.scheduleReplace(context, key, this);\r
+ }\r
+\r
+ /**\r
+ * @param <T>\r
+ * @param clazz\r
+ * @return input of the specified class\r
+ * @throws ClassCastException if the input class does not match the\r
+ * specified class\r
+ * @throws NullPointerException if the input is null\r
+ */\r
+ @SuppressWarnings("unchecked")\r
+ protected <T> T getInput(Class<T> clazz) throws ClassCastException {\r
+ Object o = context.getConstant(BuiltinKeys.INPUT);\r
+ if (o == null)\r
+ throw new NullPointerException("null input");\r
+// return clazz.cast(o);\r
+ return (T) o;\r
+ }\r
+\r
+ /**\r
+ * @param <T>\r
+ * @param clazz\r
+ * @return <code>null</code> if input is <code>null</code> or if the class does not match\r
+ */\r
+ @SuppressWarnings("unchecked")\r
+ protected <T> T tryGetInput(Class<T> clazz) {\r
+ Object o = context.getConstant(BuiltinKeys.INPUT);\r
+ if (o != null && clazz.isInstance(o))\r
+// return clazz.cast(o);\r
+ return (T) o;\r
+ return null;\r
+ }\r
+\r
+ @Override\r
+ public Tester getNodeContextTester() {\r
+ return null;\r
+ }\r
+\r
+}\r
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