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/**
*
*/
package javax.jmdns.impl.constants;
/**
* DNS label.
*
* @author Arthur van Hoff, Jeff Sonstein, Werner Randelshofer, Pierre Frisch, Rick Blair
*/
public enum DNSLabel {
/**
* This is unallocated.
*/
Unknown("", 0x80),
/**
* Standard label [RFC 1035]
*/
Standard("standard label", 0x00),
/**
* Compressed label [RFC 1035]
*/
Compressed("compressed label", 0xC0),
/**
* Extended label [RFC 2671]
*/
Extended("extended label", 0x40);
/**
* DNS label types are encoded on the first 2 bits
*/
static final int LABEL_MASK = 0xC0;
static final int LABEL_NOT_MASK = 0x3F;
private final String _externalName;
private final int _index;
DNSLabel(String name, int index) {
_externalName = name;
_index = index;
}
/**
* Return the string representation of this type
*
* @return String
*/
public String externalName() {
return _externalName;
}
/**
* Return the numeric value of this type
*
* @return String
*/
public int indexValue() {
return _index;
}
/**
* @param index
* @return label
*/
public static DNSLabel labelForByte(int index) {
int maskedIndex = index & LABEL_MASK;
for (DNSLabel aLabel : DNSLabel.values()) {
if (aLabel._index == maskedIndex) return aLabel;
}
return Unknown;
}
/**
* @param index
* @return masked value
*/
public static int labelValue(int index) {
return index & LABEL_NOT_MASK;
}
@Override
public String toString() {
return this.name() + " index " + this.indexValue();
}
}
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