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/*******************************************************************************
* Copyright (c) 2005, 2013 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0, which accompanies this distribution
* and is available at https://www.eclipse.org/legal/epl-2.0/.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.predicate;
import java.io.Serializable;
import org.eclipse.jpt.common.utility.predicate.Predicate;
/**
* Singleton predicate that throws an
* {@link UnsupportedOperationException exception} if evaluated.
*
* @param <V> the type of objects (not) to be evaluated by the predicate
*/
public final class DisabledPredicate<V>
implements Predicate<V>, Serializable
{
@SuppressWarnings("rawtypes")
public static final Predicate INSTANCE = new DisabledPredicate();
@SuppressWarnings("unchecked")
public static <V> Predicate<V> instance() {
return INSTANCE;
}
// ensure single instance
private DisabledPredicate() {
super();
}
/**
* Throw an {@link UnsupportedOperationException exception}.
*/
public boolean evaluate(V variable) {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return this.getClass().getSimpleName();
}
private static final long serialVersionUID = 1L;
private Object readResolve() {
// replace this object with the singleton
return INSTANCE;
}
}
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