package io.eguan.utils;
/*
* #%L
* Project eguan
* %%
* Copyright (C) 2012 - 2017 Oodrive
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility class to validate a string representation of an IP address.
*
* @author oodrive
* @author llambert
*/
public final class IpAddressValidator {
/** Regexp that matches one IPv4 address digit */
private static final String IPV4_DIGIT = "([01]?\\d\\d?|2[0-4]\\d|25[0-5])";
/** Regexp that matches an IPv4 address */
private static final String IPV4_PATTERN = "^" + IPV4_DIGIT + "\\." + IPV4_DIGIT + "\\." + IPV4_DIGIT + "\\."
+ IPV4_DIGIT + "$";
/**
* No instance.
*/
private IpAddressValidator() {
throw new AssertionError("No instance");
}
/**
* Simple IPv4 addresses validator.
* <p>
* The wildcard address (0.0.0.0) and the world broadcast address (255.255.255.255) are valid. The implicit zero
* notation is not considered to be valid (ie <code>validateIPv4(192.168..1)</code> returns false.)
*
*
* @param ip
* The string that will be checked
* @return false if the input is either not a valid representation of an IP address or null and true if the input
* string represents a valid IPv4 address
*/
public static boolean validateIPv4(final String ip) {
if (ip == null) {
return false;
}
else {
final Pattern pattern = Pattern.compile(IPV4_PATTERN);
final Matcher matcher = pattern.matcher(ip);
return matcher.matches();
}
}
}