plugins/org.eclipse.emf.parsley.web.servlets/src/org/eclipse/emf/parsley/web/servlets/DefaultRealm.java

/*******************************************************************************
 * Copyright (c) 2014 RCP Vision (http://www.rcp-vision.com) 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: Lorenzo Bettini - Initial contribution and API
 *******************************************************************************/
package org.eclipse.emf.parsley.web.servlets;

import org.eclipse.core.databinding.observable.Realm;

/**
 * Simple realm implementation that will set itself as default when constructed,
 * this will be used for unit testing. Invoke {@link #dispose()} to remove the
 * realm from being the default. Does not support asyncExec(...).
 * 
 * @author Lorenzo Bettini - Initial contribution and API
 */
public class DefaultRealm extends Realm {
	private Realm previousRealm;

	public DefaultRealm() {
		previousRealm = super.setDefault(this);
	}

	/**
	 * @return always returns true
	 */
	@Override
	public boolean isCurrent() {
		return true;
	}

	@Override
	protected void syncExec(Runnable runnable) {
		runnable.run();
	}

	/**
	 * @throws UnsupportedOperationException
	 */
	@Override
	public void asyncExec(Runnable runnable) {
		throw new UnsupportedOperationException("asyncExec is unsupported");
	}

	/**
	 * Removes the realm from being the current and sets the previous realm to
	 * the default.
	 */
	public void dispose() {
		if (getDefault() == this) {
			setDefault(previousRealm);
		}
	}
}