1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.browsing.ui.graph.impl;
14 import java.util.Collections;
17 import org.simantics.browsing.ui.BuiltinKeys.LabelerKey;
18 import org.simantics.browsing.ui.DataSource;
19 import org.simantics.browsing.ui.NodeContext;
20 import org.simantics.browsing.ui.PrimitiveQueryUpdater;
21 import org.simantics.browsing.ui.common.labelers.LabelerContent;
22 import org.simantics.browsing.ui.common.labelers.LabelerStub;
23 import org.simantics.browsing.ui.graph.impl.request.ResourceQuery;
24 import org.simantics.db.AsyncReadGraph;
25 import org.simantics.db.ReadGraph;
26 import org.simantics.db.exception.DatabaseException;
27 import org.simantics.db.procedure.Listener;
28 import org.simantics.utils.ui.ErrorLogger;
29 import org.slf4j.Logger;
31 public abstract class LazyGraphLabeler extends LabelerStub {
33 protected final PrimitiveQueryUpdater updater;
34 private final ResourceQuery<LabelerContent> labelQuery;
35 private final Listener<LabelerContent> procedure;
37 public Object getIdentity(LabelerKey key) {
41 public LazyGraphLabeler(final PrimitiveQueryUpdater updater, final NodeContext context, final LabelerKey key) {
42 this.updater = updater;
44 labelQuery = new ResourceQuery<LabelerContent>(getIdentity(key), context) {
47 public LabelerContent perform(ReadGraph graph) throws DatabaseException {
49 int cat = category(graph);
50 Map<String, String> lbls = labels(graph);
51 // Make sure that null is not returned.
53 throw new NullPointerException("LazyGraphLabeler.labels is not allowed to return null, but " + LazyGraphLabeler.this.getClass() + " just did it");
54 return new LabelerContent(cat, lbls);
55 } catch (DatabaseException e) {
57 } catch (Throwable t) {
58 ErrorLogger.defaultLogError("LazyGraphLabeler.labelQuery produced unexpected exception.", t);
59 return LabelerContent.NO_CONTENT;
64 public String toString() {
65 return LazyGraphLabeler.this + " with context " + context;
70 procedure = new Listener<LabelerContent>() {
73 public void execute(LabelerContent result) {
75 updater.scheduleReplace(context, key, LazyGraphLabeler.this);
79 public boolean isDisposed() {
80 return updater.isDisposed();
84 public void exception(Throwable t) {
85 getLogger().error("LazyGraphLabeler2: ", t);
92 public Map<String, String> getLabels() {
94 if (content == LabelerContent.NO_CONTENT) {
96 final DataSource<AsyncReadGraph> source = updater.getDataSource(AsyncReadGraph.class);
97 assert(source != null);
98 source.schedule(graph -> graph.asyncRequest(labelQuery, procedure));
102 if(content == null) return Collections.emptyMap();
104 return content.labels;
110 public abstract Map<String, String> labels(ReadGraph graph) throws DatabaseException;
112 public int category(ReadGraph graph) throws DatabaseException {
114 if(content == null) return 0;
116 return content.category;
120 public abstract Logger getLogger();