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/******************************************************************************
* Copyright (c) 2006, 2020 Eclipse.org, CEA LIST, Artal
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Dmitry Stadnik - initial API and implementation
* Aurelien Didier (ARTAL) - aurelien.didier51@gmail.com - Bug 569174
*****************************************************************************/
package org.eclipse.papyrus.gmf.internal.bridge.ui.dashboard;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
import org.eclipse.papyrus.gmf.bridge.ui.dashboard.DashboardAction;
import org.eclipse.papyrus.gmf.bridge.ui.dashboard.DashboardFacade;
import org.eclipse.ui.PlatformUI;
/**
* @author dstadnik
*/
public class DashboardActionRegistry implements IExtensionChangeHandler {
private static String EXTENSIONPOINT_UNIQUE_ID = "org.eclipse.papyrus.gmf.bridge.ui.dashboard.actions"; //$NON-NLS-1$
private Set<DashboardMediator> mediators;
private Set<DashboardActionDescriptor> descriptors;
public DashboardActionRegistry() {
mediators = new HashSet<DashboardMediator>();
descriptors = new HashSet<DashboardActionDescriptor>();
PlatformUI.getWorkbench().getExtensionTracker().registerHandler(this, ExtensionTracker.createExtensionPointFilter(getExtensionPointFilter()));
IExtensionPoint point = Platform.getExtensionRegistry().getExtensionPoint(EXTENSIONPOINT_UNIQUE_ID);
if (point != null) {
IExtension[] extensions = point.getExtensions();
extensions = orderExtensions(extensions);
for (IExtension extension : extensions) {
addDescriptors(extension);
}
}
}
public void dispose() {
PlatformUI.getWorkbench().getExtensionTracker().unregisterHandler(this);
}
private IExtensionPoint getExtensionPointFilter() {
return Platform.getExtensionRegistry().getExtensionPoint(EXTENSIONPOINT_UNIQUE_ID);
}
void registerMediator(DashboardMediator mediator) {
mediators.add(mediator);
}
void unregisterMediator(DashboardMediator mediator) {
mediators.remove(mediator);
}
public void addExtension(IExtensionTracker tracker, IExtension addedExtension) {
addDescriptors(addedExtension);
}
public void removeExtension(IExtension extension, Object[] objects) {
for (Object object : objects) {
if (object instanceof DashboardActionDescriptor) {
DashboardActionDescriptor descriptor = (DashboardActionDescriptor) object;
descriptors.remove(descriptor);
for (DashboardMediator mediator : mediators) {
mediator.removeDashboardAction(descriptor);
}
}
}
}
public void addDescriptors(IExtension extension) {
for (IConfigurationElement element : extension.getConfigurationElements()) {
if (element.getName().equals("action")) { //$NON-NLS-1$
DashboardActionDescriptor desc = new DashboardActionDescriptor(element);
descriptors.add(desc);
PlatformUI.getWorkbench().getExtensionTracker().registerObject(element.getDeclaringExtension(), desc, IExtensionTracker.REF_STRONG);
for (DashboardMediator mediator : mediators) {
mediator.addDashboardAction(desc);
}
}
}
}
public static IExtension[] orderExtensions(IExtension[] extensions) {
// By default, the order is based on plugin id sorted
// in ascending order. The order for a plugin providing
// more than one extension for an extension point is
// dependent in the order listed in the XML file.
IExtension[] sortedExtension = new IExtension[extensions.length];
System.arraycopy(extensions, 0, sortedExtension, 0, extensions.length);
Comparator<IExtension> comparer = new Comparator<IExtension>() {
public int compare(IExtension arg0, IExtension arg1) {
String s1 = arg0.getNamespaceIdentifier();
String s2 = arg1.getNamespaceIdentifier();
return s1.compareToIgnoreCase(s2);
}
};
Collections.sort(Arrays.asList(sortedExtension), comparer);
return sortedExtension;
}
public DashboardActionDescriptor[] getDescriptors() {
return descriptors.toArray(new DashboardActionDescriptor[descriptors.size()]);
}
public static class DashboardActionDescriptor {
private final IConfigurationElement element;
private final String label;
private final String location;
private final boolean standard;
public DashboardActionDescriptor(IConfigurationElement element) {
this.element = element;
label = element.getAttribute("label"); //$NON-NLS-1$
location = element.getAttribute("location"); //$NON-NLS-1$
standard = Boolean.valueOf(element.getAttribute("standard")).booleanValue(); //$NON-NLS-1$
}
public IConfigurationElement getElement() {
return element;
}
public String getLabel() {
return label;
}
public DashboardAction createDashboardAction() {
return new Proxy();
}
public DashboardAction createContributedDashboardAction() {
try {
return (DashboardAction) element.createExecutableExtension("class"); //$NON-NLS-1$
} catch (Exception e) {
Plugin.getDefault().getLog().log(Plugin.createError("Unable to create GMF Dashboard action", e)); //$NON-NLS-1$
}
return null;
}
public String getLocation() {
return location;
}
public boolean isStandard() {
return standard;
}
private class Proxy implements DashboardAction {
private DashboardFacade context;
private boolean inited;
private DashboardAction delegate;
private boolean notAvailable;
public void init(DashboardFacade context) {
this.context = context;
inited = true;
}
public boolean isEnabled() {
if (delegate != null) {
return delegate.isEnabled();
}
if (notAvailable) {
return false;
}
return true;
}
public void run() {
if (notAvailable) {
return;
}
if (delegate == null) {
delegate = createContributedDashboardAction();
if (delegate == null) {
notAvailable = true;
return;
}
if (inited) {
delegate.init(context);
}
}
if (delegate.isEnabled()) {
delegate.run();
}
}
}
}
}
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