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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.utility.tests.internal.model.value.prefs;
import java.util.EventObject;
import java.util.List;
import java.util.prefs.AbstractPreferences;
import java.util.prefs.Preferences;
import org.eclipse.jpt.utility.internal.ClassTools;
import org.eclipse.jpt.utility.tests.internal.TestTools;
import junit.framework.TestCase;
/**
* set up and tear down a test node for any subclass that
* needs to test preferences-related stuff
*/
public abstract class PreferencesTestCase extends TestCase {
protected Preferences classNode;
public Preferences testNode;
protected static final String TEST_NODE_NAME = "test node";
public PreferencesTestCase(String name) {
super(name);
}
@Override
protected void setUp() throws Exception {
super.setUp();
Preferences packageNode = Preferences.userNodeForPackage(this.getClass());
this.classNode = packageNode.node(ClassTools.shortClassNameForObject(this));
// clean out any leftover crap...
if ((this.classNode.keys().length > 0) || (this.classNode.childrenNames().length > 0)) {
this.classNode.removeNode();
// ...and re-create the node
this.classNode = packageNode.node(ClassTools.shortClassNameForObject(this));
}
this.testNode = this.classNode.node(TEST_NODE_NAME);
}
@Override
protected void tearDown() throws Exception {
// wait for all the events to be delivered before tearing down
this.waitForEventQueueToClear();
Preferences node = this.classNode.parent();
this.classNode.removeNode();
while (this.nodeIsVestigial(node)) {
Preferences parent = node.parent();
node.removeNode();
node = parent;
}
TestTools.clear(this);
super.tearDown();
}
private boolean nodeIsVestigial(Preferences node) throws Exception {
return (node != null)
&& (node.keys().length == 0)
&& (node.childrenNames().length == 0)
&& (node != Preferences.userRoot());
}
protected void waitForEventQueueToClear() {
try {
while ( ! this.preferencesEventQueue().isEmpty()) {
Thread.sleep(100);
}
Thread.sleep(100);
} catch (InterruptedException ex) {
throw new RuntimeException(ex);
}
}
@SuppressWarnings("unchecked")
private List<EventObject> preferencesEventQueue() {
return (List<EventObject>) ClassTools.staticFieldValue(AbstractPreferences.class, "eventQueue");
}
}
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