DatabindingTestRealm.java

/*******************************************************************************
 * Copyright (c) 2012 Michael Vorburger (http://www.vorburger.ch).
 * 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
 *******************************************************************************/

/**
 *  Copyright 2012 Michael Vorburger (http://www.vorburger.ch)
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package ch.vorburger.databinding.tests.utils;

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

/**
 * DataBinding Realm for Unit Tests.
 * 
 * "Simple realm implementation that will set itself as default when constructed. Invoke
 * {@link #dispose()} to remove the realm from being the default. Does not support asyncExec(...)."
 * 
 * @see http://wiki.eclipse.org/JFace_Data_Binding/Realm
 */
public class DatabindingTestRealm extends Realm {
    private Realm previousRealm;

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

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

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

    /**
     * @throws UnsupportedOperationException
     */
    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);
        }
    }
}