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/*******************************************************************************
* Copyright (c) 2009, 2013 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.core.commands.internal;
import org.eclipse.core.commands.CommandManager;
import org.eclipse.e4.core.contexts.ContextFunction;
import org.eclipse.e4.core.contexts.ContextInjectionFactory;
import org.eclipse.e4.core.contexts.IEclipseContext;
/**
*
*/
public class CommandServiceCreationFunction extends ContextFunction {
/**
* A context key (value "rootContext") that identifies the root of this context chain. It does
* not have to be the global root, but signifies the topmost context for the purposes of
* function management and active context chains.
*/
public static final String ROOT_CONTEXT = "rootContext"; //$NON-NLS-1$
private CommandManager manager = null;
private CommandServiceImpl service = null;
/*
* (non-Javadoc)
*
* @see
* org.eclipse.e4.core.services.context.spi.ContextFunction#compute(org.eclipse.e4.core.services
* .context.IEclipseContext, java.lang.Object[])
*/
@Override
public Object compute(IEclipseContext context, String contextKey) {
if (service == null) {
IEclipseContext root = getRootContext(context);
manager = new CommandManager();
root.set(CommandManager.class.getName(), manager);
service = ContextInjectionFactory.make(CommandServiceImpl.class, root);
}
return service;
}
/**
* @param context
* @return the topmost "root" context
*/
private IEclipseContext getRootContext(IEclipseContext context) {
IEclipseContext current = (IEclipseContext) context.get(ROOT_CONTEXT);
if (current != null) {
return current;
}
current = context;
IEclipseContext parent = current.getParent();
while (parent != null) {
current = parent;
parent = current.getParent();
}
if (current != null) {
current.set(ROOT_CONTEXT, current);
}
return current;
}
}
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