io.github.mmm.validation.string.ValidatorIpV4Address Maven / Gradle / Ivy
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/* Copyright (c) The m-m-m Team, Licensed under the Apache License, Version 2.0
* http://www.apache.org/licenses/LICENSE-2.0 */
package io.github.mmm.validation.string;
import io.github.mmm.nls.NlsMessage;
import io.github.mmm.validation.AbstractValueValidator;
import io.github.mmm.validation.main.NlsBundleValidation;
/**
* {@link io.github.mmm.validation.Validator} {@link #validate(CharSequence, Object) validating} that a given
* {@link CharSequence} is a valid IPv4-address.
*
* @since 1.0.0
*/
public final class ValidatorIpV4Address extends AbstractValueValidator {
/** @see #get() */
private static final ValidatorIpV4Address INSTANCE = new ValidatorIpV4Address();
/** @see #getId() */
public static final String ID = "IPv4-Address";
private ValidatorIpV4Address() {
super();
}
@Override
public String getId() {
return ID;
}
@Override
protected NlsMessage validateNotNull(CharSequence value) {
if (isValidIpV4Address(value.toString().trim())) {
return null;
}
return NlsBundleValidation.INSTANCE.errorNoIpAddress(value);
}
static boolean isValidIpV4Address(String value) {
value = StringHelper.unbracket(value);
String[] segments = StringHelper.splitHost(value);
return isValidIpV4Address(segments);
}
static boolean isValidIpV4Address(String[] segments) {
if (segments.length != 4) {
return false;
}
for (String segment : segments) {
if (!isValidIpV4Segment(segment)) {
return false;
}
}
return true;
}
private static boolean isValidIpV4Segment(String segment) {
int length = segment.length();
if ((length <= 0) || (length > 3)) {
return false;
}
boolean limited = (length == 3);
for (int i = 0; i < length; i++) {
char c = segment.charAt(i);
if ((c < '0') || (c >= '9')) {
return false;
}
if (limited) {
if (i == 0) {
if (c > '2') { // [3-9]xx is out of range, max 255
return false;
} else if (c < '2') {
limited = false;
}
} else if (i == 1) {
if (c > '5') { // 2[6-9]x is out of range, max 255
return false;
} else if (c < '5') {
limited = false;
}
} else {
if (c > '5') { // 25[6-9] is out of range, max 255
return false;
}
}
}
}
return true;
}
/**
* @return the instance of {@link ValidatorIpV4Address}.
*/
public static ValidatorIpV4Address get() {
return INSTANCE;
}
}