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/*******************************************************************************
* Copyright (c) 2007, 2008 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.ui.internal;
import org.eclipse.jpt.utility.Command;
import org.eclipse.jpt.utility.CommandExecutor;
import org.eclipse.swt.widgets.Display;
/**
* This implementation of CommandExecutor can be used by a non-UI
* thread to asynchronously modify a JPA project with any objects associated
* with documents that are currently displayed in the UI.
*/
public final class AsynchronousUiCommandExecutor
implements CommandExecutor
{
public static final CommandExecutor INSTANCE = new AsynchronousUiCommandExecutor();
public static CommandExecutor instance() {
return INSTANCE;
}
// ensure single instance
private AsynchronousUiCommandExecutor() {
super();
}
public void execute(Command command) {
this.display().asyncExec(this.buildRunnable(command));
}
private Runnable buildRunnable(final Command command) {
return new Runnable() {
public void run() {
command.execute();
}
};
}
private Display display() {
Display display = Display.getCurrent();
return (display != null) ? display : Display.getDefault();
}
}
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