001 /**************************************************************** 002 * Licensed to the Apache Software Foundation (ASF) under one * 003 * or more contributor license agreements. See the NOTICE file * 004 * distributed with this work for additional information * 005 * regarding copyright ownership. The ASF licenses this file * 006 * to you under the Apache License, Version 2.0 (the * 007 * "License"); you may not use this file except in compliance * 008 * with the License. You may obtain a copy of the License at * 009 * * 010 * http://www.apache.org/licenses/LICENSE-2.0 * 011 * * 012 * Unless required by applicable law or agreed to in writing, * 013 * software distributed under the License is distributed on an * 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * 015 * KIND, either express or implied. See the License for the * 016 * specific language governing permissions and limitations * 017 * under the License. * 018 ****************************************************************/ 019 020 package org.apache.james.mime4j.field.address; 021 022 import java.io.Serializable; 023 import java.util.AbstractList; 024 import java.util.ArrayList; 025 import java.util.Collections; 026 import java.util.List; 027 028 /** 029 * An immutable, random-access list of Strings (that are supposedly domain names 030 * or domain literals). 031 */ 032 public class DomainList extends AbstractList<String> implements Serializable { 033 034 private static final long serialVersionUID = 1L; 035 036 private final List<String> domains; 037 038 /** 039 * @param domains 040 * A List that contains only String objects. 041 * @param dontCopy 042 * true iff it is not possible for the domains list to be 043 * modified by someone else. 044 */ 045 public DomainList(List<String> domains, boolean dontCopy) { 046 if (domains != null) 047 this.domains = dontCopy ? domains : new ArrayList<String>(domains); 048 else 049 this.domains = Collections.emptyList(); 050 } 051 052 /** 053 * The number of elements in this list. 054 */ 055 @Override 056 public int size() { 057 return domains.size(); 058 } 059 060 /** 061 * Gets the domain name or domain literal at the specified index. 062 * 063 * @throws IndexOutOfBoundsException 064 * If index is < 0 or >= size(). 065 */ 066 @Override 067 public String get(int index) { 068 return domains.get(index); 069 } 070 071 /** 072 * Returns the list of domains formatted as a route string (not including 073 * the trailing ':'). 074 */ 075 public String toRouteString() { 076 StringBuilder sb = new StringBuilder(); 077 078 for (String domain : domains) { 079 if (sb.length() > 0) { 080 sb.append(','); 081 } 082 083 sb.append("@"); 084 sb.append(domain); 085 } 086 087 return sb.toString(); 088 } 089 090 @Override 091 public String toString() { 092 return toRouteString(); 093 } 094 095 }