diff options
Diffstat (limited to 'src/javax/jmdns/impl/constants/DNSLabel.java')
-rw-r--r-- | src/javax/jmdns/impl/constants/DNSLabel.java | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/javax/jmdns/impl/constants/DNSLabel.java b/src/javax/jmdns/impl/constants/DNSLabel.java new file mode 100644 index 0000000..4e27f84 --- /dev/null +++ b/src/javax/jmdns/impl/constants/DNSLabel.java @@ -0,0 +1,87 @@ +/** + * + */ +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(); + } + +} |