| /* |
| * Copyright (c) 2014 Eike Stepper (Berlin, Germany) 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: |
| * Eike Stepper - initial API and implementation |
| */ |
| package org.eclipse.oomph.internal.ui; |
| |
| import org.eclipse.oomph.ui.UIUtil; |
| |
| import org.eclipse.swt.widgets.Display; |
| |
| public abstract class WorkUnit<R, E extends Throwable> |
| { |
| private final Class<E> exceptionType; |
| |
| private R result; |
| |
| private Throwable throwable; |
| |
| protected WorkUnit() |
| { |
| this(null); |
| } |
| |
| protected WorkUnit(Class<E> exceptionType) |
| { |
| this.exceptionType = exceptionType; |
| } |
| |
| protected abstract R doExecute() throws E; |
| |
| public R execute() throws E |
| { |
| return execute(UIUtil.getDisplay()); |
| } |
| |
| public R execute(final Display display) throws E |
| { |
| if (display.isDisposed()) |
| { |
| return null; |
| } |
| |
| display.syncExec(new Runnable() |
| { |
| public void run() |
| { |
| if (display.isDisposed()) |
| { |
| return; |
| } |
| |
| try |
| { |
| result = doExecute(); |
| } |
| catch (Throwable ex) |
| { |
| throwable = ex; |
| } |
| } |
| }); |
| |
| rethrow(); |
| return result; |
| } |
| |
| protected void rethrow() throws E |
| { |
| if (throwable != null) |
| { |
| if (exceptionType == null) |
| { |
| if (throwable instanceof RuntimeException) |
| { |
| throw (RuntimeException)throwable; |
| } |
| |
| throw new RuntimeException(throwable); |
| } |
| |
| throw exceptionType.cast(throwable); |
| } |
| } |
| |
| public static abstract class Void<E extends Throwable> extends WorkUnit<Object, E> |
| { |
| public Void() |
| { |
| this(null); |
| } |
| |
| public Void(Class<E> exceptionType) |
| { |
| super(exceptionType); |
| } |
| |
| @Override |
| protected final Object doExecute() throws E |
| { |
| doProcess(); |
| return null; |
| } |
| |
| protected abstract void doProcess() throws E; |
| |
| public void process() throws E |
| { |
| execute(); |
| } |
| } |
| } |