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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.Collection;
import java.util.Iterator;
import org.eclipse.jpt.utility.internal.StringTools;
/**
* A <code>ReadOnlyIterator</code> wraps another <code>Iterator</code>
* and removes support for #remove().
*/
public class ReadOnlyIterator<E>
implements Iterator<E>
{
private final Iterator<? extends E> nestedIterator;
/**
* Construct an iterator on the specified collection that
* disallows removes.
*/
public ReadOnlyIterator(Collection<? extends E> c) {
this(c.iterator());
}
/**
* Construct an iterator with the specified nested iterator
* and disallow removes.
*/
public ReadOnlyIterator(Iterator<? extends E> nestedIterator) {
super();
this.nestedIterator = nestedIterator;
}
public boolean hasNext() {
// delegate to the nested iterator
return this.nestedIterator.hasNext();
}
public E next() {
// delegate to the nested iterator
return this.nestedIterator.next();
}
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.nestedIterator);
}
}
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