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/**
*
*/
package javax.jmdns.impl.constants;
/**
* DNS operation code.
*
* @author Arthur van Hoff, Jeff Sonstein, Werner Randelshofer, Pierre Frisch, Rick Blair
*/
public enum DNSOperationCode {
/**
* Query [RFC1035]
*/
Query("Query", 0),
/**
* IQuery (Inverse Query, Obsolete) [RFC3425]
*/
IQuery("Inverse Query", 1),
/**
* Status [RFC1035]
*/
Status("Status", 2),
/**
* Unassigned
*/
Unassigned("Unassigned", 3),
/**
* Notify [RFC1996]
*/
Notify("Notify", 4),
/**
* Update [RFC2136]
*/
Update("Update", 5);
/**
* DNS RCode types are encoded on the last 4 bits
*/
static final int OpCode_MASK = 0x7800;
private final String _externalName;
private final int _index;
DNSOperationCode(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 flags
* @return label
*/
public static DNSOperationCode operationCodeForFlags(int flags) {
int maskedIndex = (flags & OpCode_MASK) >> 11;
for (DNSOperationCode aCode : DNSOperationCode.values()) {
if (aCode._index == maskedIndex) return aCode;
}
return Unassigned;
}
@Override
public String toString() {
return this.name() + " index " + this.indexValue();
}
}
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