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/*******************************************************************************
* Copyright (c) 2013 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.common.utility.internal.closure;
import org.eclipse.jpt.common.utility.closure.Closure;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.common.utility.predicate.Predicate;
/**
* Closure that executes another closure until a predicate evaluates to
* <code>true</code> when passed the argument. The wrapped closure will
* always execute at least once.
* <p>
* <strong>NB:</strong> This is the inverse of the Java <code>do-while</code>
* statement (i.e. it executes until the predicate evaluates to
* <strong><code>true</code></strong>,
* <em>not</em> <code>false</code>).
*
* @param <A> the type of the object passed to the closure
*
* @see ConditionalClosure
* @see RepeatingClosure
* @see SwitchClosure
* @see WhileClosure
*/
public class UntilClosure<A>
implements Closure<A>
{
private final Closure<? super A> closure;
private final Predicate<? super A> predicate;
public UntilClosure(Closure<? super A> closure, Predicate<? super A> predicate) {
super();
if ((closure == null) || (predicate == null)) {
throw new NullPointerException();
}
this.predicate = predicate;
this.closure = closure;
}
public void execute(A argument) {
do {
this.closure.execute(argument);
} while ( ! this.predicate.evaluate(argument));
}
@Override
public String toString() {
return ObjectTools.toString(this, this.predicate);
}
}
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