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// GenericsNote: Converted.
/*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smack.util.collections;
import java.util.NoSuchElementException;
/**
* Provides an implementation of an empty iterator.
*
* @author Matt Hall, John Watkinson, Stephen Colebourne
* @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:24 $
* @since Commons Collections 3.1
*/
abstract class AbstractEmptyIterator <E> {
/**
* Constructor.
*/
protected AbstractEmptyIterator() {
super();
}
public boolean hasNext() {
return false;
}
public E next() {
throw new NoSuchElementException("Iterator contains no elements");
}
public boolean hasPrevious() {
return false;
}
public E previous() {
throw new NoSuchElementException("Iterator contains no elements");
}
public int nextIndex() {
return 0;
}
public int previousIndex() {
return -1;
}
public void add(E obj) {
throw new UnsupportedOperationException("add() not supported for empty Iterator");
}
public void set(E obj) {
throw new IllegalStateException("Iterator contains no elements");
}
public void remove() {
throw new IllegalStateException("Iterator contains no elements");
}
public E getKey() {
throw new IllegalStateException("Iterator contains no elements");
}
public E getValue() {
throw new IllegalStateException("Iterator contains no elements");
}
public E setValue(E value) {
throw new IllegalStateException("Iterator contains no elements");
}
public void reset() {
// do nothing
}
}
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