/*
* 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.apache.flume.util;
import java.util.Iterator;
import java.util.List;
/**
* A utility class that iterates over the given ordered list of items via
* the specified order array. The entries of the order array indicate the
* index within the ordered list of items that needs to be picked over the
* course of iteration.
*/
public class SpecificOrderIterator<T> implements Iterator<T> {
private final int[] order;
private final List<T> items;
private int index = 0;
public SpecificOrderIterator(int[] orderArray, List<T> itemList) {
order = orderArray;
items = itemList;
}
@Override
public boolean hasNext() {
return index < order.length;
}
@Override
public T next() {
return items.get(order[index++]);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}