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/*******************************************************************************
* Copyright (c) 2009 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.iterables;
import org.eclipse.jpt.common.utility.internal.iterators.CloneListIterator;
/**
* Pull together mutator state and behavior for subclasses.
*
* @param <E> the type of elements returned by the list iterable's list iterator
*
* @see SnapshotCloneListIterable
* @see LiveCloneListIterable
*/
public abstract class CloneListIterable<E>
implements ListIterable<E>
{
final CloneListIterator.Mutator<E> mutator;
// ********** constructors **********
protected CloneListIterable() {
super();
this.mutator = this.buildDefaultMutator();
}
protected CloneListIterable(CloneListIterator.Mutator<E> mutator) {
super();
this.mutator = mutator;
}
protected CloneListIterator.Mutator<E> buildDefaultMutator() {
return new DefaultMutator();
}
// ********** default mutations **********
/**
* At the specified index, add the specified element to the original list.
* <p>
* This method can be overridden by a subclass as an
* alternative to building a {@link CloneListIterator.Mutator}.
*/
protected void add(@SuppressWarnings("unused") int index, @SuppressWarnings("unused") E element) {
throw new RuntimeException("This method was not overridden."); //$NON-NLS-1$
}
/**
* Remove the element at the specified index from the original list.
* <p>
* This method can be overridden by a subclass as an
* alternative to building a {@link CloneListIterator.Mutator}.
*/
protected void remove(@SuppressWarnings("unused") int index) {
throw new RuntimeException("This method was not overridden."); //$NON-NLS-1$
}
/**
* At the specified index, set the specified element in the original list.
* <p>
* This method can be overridden by a subclass as an
* alternative to building a {@link CloneListIterator.Mutator}.
*/
protected void set(@SuppressWarnings("unused") int index, @SuppressWarnings("unused") E element) {
throw new RuntimeException("This method was not overridden."); //$NON-NLS-1$
}
//********** default mutator **********
protected class DefaultMutator implements CloneListIterator.Mutator<E> {
public void add(int index, E element) {
CloneListIterable.this.add(index, element);
}
public void remove(int index) {
CloneListIterable.this.remove(index);
}
public void set(int index, E element) {
CloneListIterable.this.set(index, element);
}
}
}
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