/*******************************************************************************
* Copyright (c) 2009, 2016 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.e4.ui.services.events;
import org.eclipse.e4.core.contexts.ContextFunction;
import org.eclipse.e4.core.contexts.ContextInjectionFactory;
import org.eclipse.e4.core.contexts.IContextFunction;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.ui.services.internal.events.EventBroker;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.osgi.service.event.EventAdmin;
/**
* Use this class to obtain an instance of {@link IEventBroker}.
*/
@Component(service = IContextFunction.class, property = "service.context.key=org.eclipse.e4.core.services.events.IEventBroker")
public class EventBrokerFactory extends ContextFunction {
// mandatory static reference to EventAdmin to ensure it is available before
// the factory is activated
@Reference
void setEventAdmin(EventAdmin admin) {
// don't need to do anything with the EventAdmin here
// we only need to ensure it is available before starting this factory
}
@Override
public Object compute(IEclipseContext context, String contextKey) {
EventBroker broker = context.getLocal(EventBroker.class);
if (broker == null) {
broker = ContextInjectionFactory.make(EventBroker.class, context);
context.set(EventBroker.class, broker);
}
return broker;
}
}