DNSLabel.java

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package javax.jmdns.impl.constants;

public enum DNSLabel {
    Unknown("", 0x80),
    Standard("standard label", 0x00),
    Compressed("compressed label", 0xC0),
    Extended("extended label", 0x40);

    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;
    }

    public String externalName() {
        return _externalName;
    }

    public int indexValue() {
        return _index;
    }

    public static DNSLabel labelForByte(int index) {
        int maskedIndex = index & LABEL_MASK;
        for (DNSLabel aLabel : DNSLabel.values()) {
            if (aLabel._index == maskedIndex) return aLabel;
        }
        return Unknown;
    }

    public static int labelValue(int index) {
        return index & LABEL_NOT_MASK;
    }

    @Override
    public String toString() {
        return this.name() + " index " + this.indexValue();
    }

}