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/*******************************************************************************
* Copyright (c) 2005, 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.utility.internal.iterators;
import java.util.List;
import java.util.ListIterator;
import org.eclipse.jpt.utility.internal.StringTools;
import org.eclipse.jpt.utility.internal.iterables.ListIterable;
/**
* A <code>ReadOnlyListIterator</code> wraps another
* {@link ListIterator} and removes support for:<ul>
* <li>{@link #remove()}
* <li>{@link #set(Object)}
* <li>{@link #add(Object)}
* </ul>
*
* @param <E> the type of elements returned by the list iterator
*
* @see org.eclipse.jpt.utility.internal.iterables.ReadOnlyListIterable
*/
public class ReadOnlyListIterator<E>
implements ListIterator<E>
{
private final ListIterator<? extends E> listIterator;
/**
* Construct a list iterator on the specified list that
* disallows removes, sets, and adds.
*/
public ReadOnlyListIterator(List<? extends E> list) {
this(list.listIterator());
}
/**
* Construct a list iterator on the specified list that
* disallows removes, sets, and adds.
*/
public ReadOnlyListIterator(ListIterable<? extends E> listIterable) {
this(listIterable.iterator());
}
/**
* Construct a list iterator on the specified list iterator that
* disallows removes, sets, and adds.
*/
public ReadOnlyListIterator(ListIterator<? extends E> listIterator) {
super();
this.listIterator = listIterator;
}
public boolean hasNext() {
// delegate to the nested iterator
return this.listIterator.hasNext();
}
public E next() {
// delegate to the nested iterator
return this.listIterator.next();
}
public boolean hasPrevious() {
// delegate to the nested iterator
return this.listIterator.hasPrevious();
}
public E previous() {
// delegate to the nested iterator
return this.listIterator.previous();
}
public int nextIndex() {
// delegate to the nested iterator
return this.listIterator.nextIndex();
}
public int previousIndex() {
// delegate to the nested iterator
return this.listIterator.previousIndex();
}
public void remove() {
throw new UnsupportedOperationException();
}
public void set(E o) {
throw new UnsupportedOperationException();
}
public void add(E o) {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.listIterator);
}
}
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