| /** |
| * 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.hadoop.gateway.filter; |
| |
| import java.util.Enumeration; |
| import java.util.NoSuchElementException; |
| |
| public class CompositeEnumeration<T> implements Enumeration<T> { |
| |
| private int index = 0; |
| private Enumeration<T>[] array; |
| |
| public CompositeEnumeration(Enumeration<T>... enumerations) { |
| if( enumerations == null ) { |
| throw new IllegalArgumentException( "enumerations==null" ); |
| } |
| this.array = enumerations; |
| } |
| |
| @Override |
| public boolean hasMoreElements() { |
| while( array.length > 0 && index < array.length ) { |
| if( array[index].hasMoreElements() ) { |
| return true; |
| } else { |
| index++; |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| public T nextElement() { |
| if( hasMoreElements() ) { |
| return array[index].nextElement(); |
| } else { |
| throw new NoSuchElementException(); |
| } |
| } |
| |
| } |