001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. 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.openstreetmap.josm.data.validation.routines; 018 019/** 020 * <p><b>InetAddress</b> validation and conversion routines (<code>java.net.InetAddress</code>).</p> 021 * 022 * <p>This class provides methods to validate a candidate IP address. 023 * 024 * <p> 025 * This class is a Singleton; you can retrieve the instance via the {@link #getInstance()} method. 026 * </p> 027 * 028 * @version $Revision: 1227719 $ 029 * @since Validator 1.4 030 */ 031public class InetAddressValidator extends AbstractValidator { 032 033 private static final String IPV4_REGEX = 034 "^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$"; 035 036 /** 037 * Singleton instance of this class. 038 */ 039 private static final InetAddressValidator VALIDATOR = new InetAddressValidator(); 040 041 /** IPv4 RegexValidator */ 042 private final RegexValidator ipv4Validator = new RegexValidator(IPV4_REGEX); 043 044 /** 045 * Returns the singleton instance of this validator. 046 * @return the singleton instance of this validator 047 */ 048 public static InetAddressValidator getInstance() { 049 return VALIDATOR; 050 } 051 052 /** 053 * Checks if the specified string is a valid IP address. 054 * @param inetAddress the string to validate 055 * @return true if the string validates as an IP address 056 */ 057 public boolean isValid(String inetAddress) { 058 return isValidInet4Address(inetAddress); 059 } 060 061 /** 062 * Validates an IPv4 address. Returns true if valid. 063 * @param inet4Address the IPv4 address to validate 064 * @return true if the argument contains a valid IPv4 address 065 */ 066 public boolean isValidInet4Address(String inet4Address) { 067 // verify that address conforms to generic IPv4 format 068 String[] groups = ipv4Validator.match(inet4Address); 069 070 if (groups == null) return false; 071 072 // verify that address subgroups are legal 073 for (int i = 0; i <= 3; i++) { 074 String ipSegment = groups[i]; 075 if (ipSegment == null || ipSegment.length() <= 0) { 076 return false; 077 } 078 079 int iIpSegment = 0; 080 081 try { 082 iIpSegment = Integer.parseInt(ipSegment); 083 } catch(NumberFormatException e) { 084 return false; 085 } 086 087 if (iIpSegment > 255) { 088 return false; 089 } 090 091 } 092 093 return true; 094 } 095}