001 // Copyright 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.web; 016 017 import java.util.ArrayList; 018 import java.util.Collections; 019 import java.util.Enumeration; 020 import java.util.List; 021 022 import org.apache.hivemind.util.Defense; 023 024 /** 025 * @author Howard M. Lewis Ship 026 * @since 4.0 027 */ 028 public class WebUtils 029 { 030 /** 031 * Converts an Enumeration of Strings into an unmodifiable List of Strings, sorted into 032 * ascending order. 033 */ 034 035 public static List toSortedList(Enumeration e) 036 { 037 Defense.notNull(e, "e"); 038 039 List list = new ArrayList(); 040 while (e.hasMoreElements()) 041 list.add(e.nextElement()); 042 043 if (list.isEmpty()) 044 return Collections.EMPTY_LIST; 045 046 Collections.sort(list); 047 048 return Collections.unmodifiableList(list); 049 } 050 051 }