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/*******************************************************************************
* Copyright (c) 2005, 2007 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;
/**
* A <code>ReadOnlyListIterator</code> wraps another
* <code>ListIterator</code> and removes support for:
* #remove()
* #set(Object)
* #add(Object)
*/
public class ReadOnlyListIterator<E>
implements ListIterator<E>
{
private final ListIterator<? extends E> nestedListIterator;
/**
* Construct an iterator on the specified list that
* disallows removes, sets, and adds.
*/
public ReadOnlyListIterator(List<? extends E> list) {
this(list.listIterator());
}
/**
* Construct an iterator on the specified list iterator that
* disallows removes, sets, and adds.
*/
public ReadOnlyListIterator(ListIterator<? extends E> nestedListIterator) {
super();
this.nestedListIterator = nestedListIterator;
}
public boolean hasNext() {
// delegate to the nested iterator
return this.nestedListIterator.hasNext();
}
public E next() {
// delegate to the nested iterator
return this.nestedListIterator.next();
}
public boolean hasPrevious() {
// delegate to the nested iterator
return this.nestedListIterator.hasPrevious();
}
public E previous() {
// delegate to the nested iterator
return this.nestedListIterator.previous();
}
public int nextIndex() {
// delegate to the nested iterator
return this.nestedListIterator.nextIndex();
}
public int previousIndex() {
// delegate to the nested iterator
return this.nestedListIterator.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.nestedListIterator);
}
}
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