| /* |
| * 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.util; |
| |
| import groovy.util.BufferedIterator; |
| |
| import java.util.List; |
| import java.util.ListIterator; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * An implementation for BufferedIterator wraps ListIterator. This version |
| * provides an implementation for remove(). |
| * |
| * @since 2.5.0 |
| */ |
| public class ListBufferedIterator<T> implements BufferedIterator<T> { |
| |
| private final List<T> list; |
| private final ListIterator<T> iter; |
| |
| public ListBufferedIterator(List<T> list) { |
| this.list = list; |
| this.iter = list.listIterator(); |
| } |
| |
| public boolean hasNext() { |
| return iter.hasNext(); |
| } |
| |
| public T next() { |
| return iter.next(); |
| } |
| |
| public void remove() { |
| iter.remove(); |
| } |
| |
| /** |
| * Return the next element to be returned by next() without consuming it. |
| */ |
| public T head() { |
| int index = iter.nextIndex(); |
| if (index >= list.size()) { |
| throw new NoSuchElementException(); |
| } else { |
| return list.get(index); |
| } |
| } |
| } |