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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.codehaus.groovy.runtime;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
/**
* A reverse iterator over a list. Utilizes the {@link ListIterator}
* obtained from the provided {@link List} and converts it to an
* {@link Iterator} that efficiently traverses the List
in
* reverse. The fail-fast semantics of this iterator are the same as the
* semantics of the underlying ListIterator
.
*
* @author Mike Dillon
*/
public class ReverseListIterator implements Iterator {
private ListIterator delegate;
/**
* Constructs a new ReverseListIterator
for the provided list.
* @param list the list to iterate over in reverse
*/
public ReverseListIterator(List list) {
this.delegate = list.listIterator(list.size());
}
/**
* {@inheritDoc}
*/
public boolean hasNext() {
return delegate.hasPrevious();
}
/**
* {@inheritDoc}
*/
public T next() {
return delegate.previous();
}
/**
* {@inheritDoc}
*/
public void remove() {
delegate.remove();
}
}