1 /*******************************************************************************
2 * Copyright (c) 2015 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 * Semantum Oy - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.internal.startup;
14 import java.util.Arrays;
15 import java.util.HashSet;
18 import org.eclipse.core.runtime.IConfigurationElement;
19 import org.eclipse.core.runtime.IExtension;
20 import org.eclipse.core.runtime.IExtensionPoint;
21 import org.eclipse.core.runtime.Platform;
22 import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
23 import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
24 import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
25 import org.eclipse.core.runtime.dynamichelpers.IFilter;
28 * Registry implementation for org.simantics.startup extensions.
30 * @author Tuukka Lehtonen
32 public class StartupRegistry implements IExtensionChangeHandler {
34 private final static String NAMESPACE = "org.simantics";
35 private final static String EP_NAME = "startup";
36 private final static String STARTUP = "startup";
38 private final ExtensionTracker tracker;
40 private StartupExtension[] extensions = {};
42 public StartupRegistry() {
43 tracker = new ExtensionTracker();
45 // Cache defined actions
46 IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);
47 loadExtensions(expt.getConfigurationElements());
49 // Start tracking for new and removed extensions
50 IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
51 tracker.registerHandler(this, filter);
54 private void loadExtensions(IConfigurationElement[] configurationElements) {
55 Set<StartupExtension> newExtensions = new HashSet<StartupExtension>(Arrays.asList(extensions));
57 // These are all "startup" elements with required attributes
59 for (IConfigurationElement el : configurationElements) {
60 if (STARTUP.equals(el.getName())) {
61 String clazz = el.getAttribute(StartupExtension.CLASS);
67 StartupExtension ext = new StartupExtension(el);
69 // Start tracking the new extension object, its removal will be notified of
70 // with removeExtension(extension, Object[]).
71 tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
73 newExtensions.add(ext);
78 this.extensions = newExtensions.toArray(new StartupExtension[newExtensions.size()]);
82 public void addExtension(IExtensionTracker tracker, IExtension extension) {
83 loadExtensions(extension.getConfigurationElements());
87 public void removeExtension(IExtension extension, Object[] objects) {
88 Set<StartupExtension> newExtensions = new HashSet<StartupExtension>(Arrays.asList(extensions));
90 for (Object o : objects) {
91 tracker.unregisterObject(extension, o);
92 newExtensions.remove(o);
96 this.extensions = newExtensions.toArray(new StartupExtension[newExtensions.size()]);
99 public StartupExtension[] getExtensions() {