001/** 002 * 003 * Copyright © 2014-2018 Florian Schmaus 004 * 005 * Licensed under the Apache License, Version 2.0 (the "License"); 006 * you may not use this file except in compliance with the License. 007 * You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.jxmpp.jid.parts; 018 019import org.jxmpp.stringprep.XmppStringPrepUtil; 020import org.jxmpp.stringprep.XmppStringprepException; 021 022/** 023 * A <i>domainpart</i> of an XMPP address (JID). 024 * <p> 025 * You can create instances of this class from Strings using {@link #from(String)}. 026 * </p> 027 * 028 * @see <a href="http://xmpp.org/rfcs/rfc6122.html#addressing-domain">RFC 6122 § 2.2. Domainpart</a> 029 */ 030public class Domainpart extends Part { 031 032 /** 033 * 034 */ 035 private static final long serialVersionUID = 1L; 036 037 private Domainpart(String domain) { 038 super(domain); 039 } 040 041 /** 042 * Get a {@link Domainpart} from a given {@link CharSequence} or {@code null} if the input is not a valid domainpart. 043 * 044 * @param cs the input CharSequence 045 * @return a Domainpart or {@code null} 046 */ 047 public static Domainpart fromOrNull(CharSequence cs) { 048 try { 049 return from(cs.toString()); 050 } catch (XmppStringprepException e) { 051 return null; 052 } 053 } 054 055 /** 056 * Like {@link #from(String)} but does throw an unchecked {@link IllegalArgumentException} instead of a 057 * {@link XmppStringprepException}. 058 * 059 * @param cs the character sequence which should be transformed to a {@link Domainpart} 060 * @return the {@link Domainpart} if no exception occurs 061 * @throws IllegalArgumentException if the given input is not a valid {@link Domainpart} 062 * @see #from(String) 063 * @since 0.6.2 064 */ 065 public static Domainpart fromOrThrowUnchecked(CharSequence cs) { 066 try { 067 return from(cs.toString()); 068 } catch (XmppStringprepException e) { 069 throw new IllegalArgumentException(e); 070 } 071 } 072 073 /** 074 * Get the {@link Domainpart} representing the input String. 075 * 076 * @param domain the input String. 077 * @return the domainpart. 078 * @throws XmppStringprepException if an error occurs. 079 */ 080 public static Domainpart from(String domain) throws XmppStringprepException { 081 if (domain == null) { 082 throw new XmppStringprepException(domain, "Input 'domain' must not be null"); 083 } 084 // TODO cache 085 // RFC 6122 § 2.2 "If the domainpart includes a final character considered to be a label 086 // separator (dot) by [IDNA2003] or [DNS], this character MUST be stripped …" 087 if (domain.length() > 0 && domain.charAt(domain.length() - 1) == '.') { 088 domain = domain.substring(0, domain.length() - 1); 089 } 090 domain = XmppStringPrepUtil.domainprep(domain); 091 // First prep the String, then assure the limits of the *result* 092 assertNotLongerThan1023BytesOrEmpty(domain); 093 return new Domainpart(domain); 094 } 095}