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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.InterruptibleClosure;
import org.eclipse.jpt.common.utility.command.InterruptibleCommand;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
/**
* Closure wrapper that checks for a <code>null</code> argument before forwarding
* the argument to the wrapped closure. If the argument is <code>null</code>,
* the closer will execute the configured command.
*
* @param <A> the type of the object passed to the closure
*/
public class NullCheckInterruptibleClosureWrapper<A>
implements InterruptibleClosure<A>
{
private final InterruptibleClosure<? super A> closure;
private final InterruptibleCommand nullCommand;
public NullCheckInterruptibleClosureWrapper(InterruptibleClosure<? super A> closure, InterruptibleCommand nullCommand) {
super();
if (closure == null) {
throw new NullPointerException();
}
this.closure = closure;
this.nullCommand = nullCommand;
}
public void execute(A argument) throws InterruptedException {
if (argument == null) {
this.nullCommand.execute();
} else {
this.closure.execute(argument);
}
}
@Override
public String toString() {
return ObjectTools.toString(this, this.closure);
}
}
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