1 /*******************************************************************************
\r
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
\r
3 * in Industry THTH ry.
\r
4 * All rights reserved. This program and the accompanying materials
\r
5 * are made available under the terms of the Eclipse Public License v1.0
\r
6 * which accompanies this distribution, and is available at
\r
7 * http://www.eclipse.org/legal/epl-v10.html
\r
10 * VTT Technical Research Centre of Finland - initial API and implementation
\r
11 *******************************************************************************/
\r
12 package org.simantics.browsing.ui.graph.impl;
\r
14 import java.util.Collections;
\r
15 import java.util.Map;
\r
17 import org.simantics.browsing.ui.BuiltinKeys.LabelerKey;
\r
18 import org.simantics.browsing.ui.DataSource;
\r
19 import org.simantics.browsing.ui.NodeContext;
\r
20 import org.simantics.browsing.ui.PrimitiveQueryUpdater;
\r
21 import org.simantics.browsing.ui.common.labelers.LabelerContent;
\r
22 import org.simantics.browsing.ui.common.labelers.LabelerStub;
\r
23 import org.simantics.browsing.ui.graph.impl.request.ResourceQuery;
\r
24 import org.simantics.db.ReadGraph;
\r
25 import org.simantics.db.exception.DatabaseException;
\r
26 import org.simantics.db.procedure.Listener;
\r
27 import org.simantics.utils.ui.ErrorLogger;
\r
29 public abstract class LazyGraphLabeler extends LabelerStub {
\r
31 protected final PrimitiveQueryUpdater updater;
\r
32 private final ResourceQuery<LabelerContent> labelQuery;
\r
33 private final Listener<LabelerContent> procedure;
\r
35 public Object getIdentity(LabelerKey key) {
\r
39 public LazyGraphLabeler(final PrimitiveQueryUpdater updater, final NodeContext context, final LabelerKey key) {
\r
40 this.updater = updater;
\r
42 labelQuery = new ResourceQuery<LabelerContent>(getIdentity(key), context) {
\r
45 public LabelerContent perform(ReadGraph graph) throws DatabaseException {
\r
47 int cat = category(graph);
\r
48 Map<String, String> lbls = labels(graph);
\r
49 // Make sure that null is not returned.
\r
51 throw new NullPointerException("LazyGraphLabeler.labels is not allowed to return null, but " + LazyGraphLabeler.this.getClass() + " just did it");
\r
52 return new LabelerContent(cat, lbls);
\r
53 } catch (DatabaseException e) {
\r
55 } catch (Throwable t) {
\r
56 ErrorLogger.defaultLogError("LazyGraphLabeler.labelQuery produced unexpected exception.", t);
\r
57 return LabelerContent.NO_CONTENT;
\r
62 public String toString() {
\r
63 return LazyGraphLabeler.this + " with context " + context;
\r
68 procedure = new Listener<LabelerContent>() {
\r
71 public void execute(LabelerContent result) {
\r
73 updater.scheduleReplace(context, key, LazyGraphLabeler.this);
\r
77 public boolean isDisposed() {
\r
78 return updater.isDisposed();
\r
82 public void exception(Throwable t) {
\r
83 System.err.println("LazyGraphLabeler2: ");
\r
84 t.printStackTrace();
\r
91 public Map<String, String> getLabels() {
\r
93 if (content == LabelerContent.NO_CONTENT) {
\r
95 final DataSource<ReadGraph> source = updater.getDataSource(ReadGraph.class);
\r
96 assert(source != null);
\r
97 source.schedule(graph -> graph.asyncRequest(labelQuery, procedure));
\r
101 if(content == null) return Collections.emptyMap();
\r
103 return content.labels;
\r
109 public abstract Map<String, String> labels(ReadGraph graph) throws DatabaseException;
\r
111 public int category(ReadGraph graph) throws DatabaseException {
\r
113 if(content == null) return 0;
\r
115 return content.category;
\r