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/*******************************************************************************
* Copyright (c) 2010, 2015 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.reference;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.common.utility.predicate.Predicate;
import org.eclipse.jpt.common.utility.transformer.Transformer;
/**
* Provide a container for holding an object.
* <p>
* Provisional API: This interface is part of an interim API that is still
* under development and expected to change significantly before reaching
* stability. It is available at this early stage to solicit feedback from
* pioneering adopters on the understanding that any code that uses this API
* will almost certainly be broken (repeatedly) as the API evolves.
*
* @see ModifiableObjectReference
*/
public interface ObjectReference<V> {
/**
* Return the current value.
*/
V getValue();
@SuppressWarnings("rawtypes")
Transformer TRANSFORMER = new ValueTransformer();
class ValueTransformer<V>
implements Transformer<ObjectReference<V>, V>
{
public V transform(ObjectReference<V> ref) {
return ref.getValue();
}
@Override
public String toString() {
return ObjectTools.singletonToString(this);
}
}
/**
* Return whether the current value is
* {@link Object#equals(Object) equal} to the specified object.
*/
boolean valueEquals(Object object);
/**
* Return whether the current value is <em>not</em>
* {@link Object#equals(Object) equal} to the specified object.
*/
boolean valueNotEqual(Object object);
/**
* Return whether the current value is
* identical (<code>==</code>) to the specified object.
*/
boolean is(Object object);
/**
* Return whether the current value is <em>not</em>
* identical (<code>==</code>) to the specified object.
*/
boolean isNot(Object object);
/**
* Return whether the current value is <code>null</code>.
*/
boolean isNull();
/**
* Return whether the current value is not <code>null</code>.
*/
boolean isNotNull();
/**
* Return whether the current value is a
* member of the set specified by the specified predicate.
*/
boolean isMemberOf(Predicate<? super V> predicate);
/**
* Return whether the current value is <em>not</em> a
* member of the set specified by the specified predicate.
*/
boolean isNotMemberOf(Predicate<? super V> predicate);
}
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