| /* |
| * $Id$ |
| * |
| * 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.tiles.request.collection; |
| |
| import java.util.Enumeration; |
| |
| /** |
| * Utilities for requests. |
| * |
| * @version $Rev: 1064782 $ $Date: 2011-01-28 18:08:52 +0100 (Fri, 28 Jan 2011) $ |
| */ |
| public final class CollectionUtil { |
| |
| /** |
| * Constructor. |
| */ |
| private CollectionUtil() { |
| |
| } |
| |
| /** |
| * Returns the string representation of the key. |
| * |
| * @param key The key. |
| * @return The string representation of the key. |
| * @throws IllegalArgumentException If the key is <code>null</code>. |
| */ |
| public static String key(Object key) { |
| if (key == null) { |
| throw new IllegalArgumentException(); |
| } else if (key instanceof String) { |
| return ((String) key); |
| } else { |
| return (key.toString()); |
| } |
| } |
| |
| /** |
| * Returns the number of elements in an enumeration, by iterating it. |
| * |
| * @param keys The enumeration. |
| * @return The number of elements. |
| */ |
| public static int enumerationSize(Enumeration<?> keys) { |
| int n = 0; |
| while (keys.hasMoreElements()) { |
| keys.nextElement(); |
| n++; |
| } |
| return n; |
| } |
| } |