org.minidns.dnslabel.ReservedLdhLabel Maven / Gradle / Ivy
/*
* Copyright 2015-2024 the original author or authors
*
* This software is licensed under the Apache License, Version 2.0,
* the GNU Lesser General Public License version 2 or later ("LGPL")
* and the WTFPL.
* You may choose either license to govern your use of this software only
* upon the condition that you accept all of the terms of either
* the Apache License 2.0, the LGPL 2.1+ or the WTFPL.
*/
package org.minidns.dnslabel;
/**
* A reserved LDH label (R-LDH label), which have the property that they contain "--" in the third and fourth characters.
*
*/
public class ReservedLdhLabel extends LdhLabel {
protected ReservedLdhLabel(String label) {
super(label);
assert isReservedLdhLabelInternal(label);
}
public static boolean isReservedLdhLabel(String label) {
if (!isLdhLabel(label)) {
return false;
}
return isReservedLdhLabelInternal(label);
}
static boolean isReservedLdhLabelInternal(String label) {
return label.length() >= 4
&& label.charAt(2) == '-'
&& label.charAt(3) == '-';
}
}