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/*******************************************************************************
* Copyright (c) 2013, 2016 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.Association;
import org.eclipse.jpt.common.utility.closure.Closure;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.common.utility.internal.iterable.IterableTools;
import org.eclipse.jpt.common.utility.predicate.Predicate;
/**
* Closure that loops over a configured set of predicate/closure pairs,
* passing its argument to each predicate to determine
* which of the closures to execute. Only the first closure whose predicate
* evaluates to <code>true</code> is executed, even if other, following,
* predicates would evaluate to <code>true</code>.
* If none of the predicates evaluates to <code>true</code>, the default closure
* is executed.
*
* @param <A> the type of the object passed to the closure
*
* @see ConditionalClosure
* @see RepeatingClosure
* @see UntilClosure
* @see WhileClosure
*/
public class SwitchClosure<A>
implements Closure<A>
{
private final Iterable<? extends Association<? extends Predicate<? super A>, ? extends Closure<? super A>>> closures;
private final Closure<? super A> defaultClosure;
public SwitchClosure(Iterable<? extends Association<? extends Predicate<? super A>, ? extends Closure<? super A>>> closures, Closure<? super A> defaultClosure) {
super();
if (IterableTools.isOrContainsNull(closures)) {
throw new NullPointerException();
}
this.closures = closures;
if (defaultClosure == null) {
throw new NullPointerException();
}
this.defaultClosure = defaultClosure;
}
public void execute(A argument) {
for (Association<? extends Predicate<? super A>, ? extends Closure<? super A>> association : this.closures) {
if (association.getKey().evaluate(argument)) {
association.getValue().execute(argument);
return; // execute only one closure
}
}
this.defaultClosure.execute(argument);
}
@Override
public String toString() {
return ObjectTools.toString(this, this.closures);
}
}
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