javax.jmdns.impl.constants.DNSOperationCode Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jmdns Show documentation

JmDNS is a Java implementation of multi-cast DNS and can be used for service registration and discovery in local area networks. JmDNS is fully compatible with Apple's Bonjour. The project was originally started in December 2002 by Arthur van Hoff at Strangeberry.

There is a newer version: 3.5.12

Show newest version

/**
 *
 */
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();
    }

}