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Java > Open Source Codes > org > apache > tapestry > web > WebUtils


1 // Copyright 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.tapestry.web;
16
17 import java.util.ArrayList JavaDoc;
18 import java.util.Collections JavaDoc;
19 import java.util.Enumeration JavaDoc;
20 import java.util.List JavaDoc;
21
22 import org.apache.hivemind.util.Defense;
23
24 /**
25  * @author Howard M. Lewis Ship
26  * @since 4.0
27  */
28 public class WebUtils
29 {
30     /**
31      * Converts an Enumeration of Strings into an unmodifiable List of Strings, sorted into
32      * ascending order.
33      */
34
35     public static List JavaDoc toSortedList(Enumeration JavaDoc e)
36     {
37         Defense.notNull(e, "e");
38
39         List JavaDoc list = new ArrayList JavaDoc();
40         while (e.hasMoreElements())
41             list.add(e.nextElement());
42
43         if (list.isEmpty())
44             return Collections.EMPTY_LIST;
45
46         Collections.sort(list);
47
48         return Collections.unmodifiableList(list);
49     }
50
51 }
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