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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.

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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package javax.jmdns.impl.constants;

/**
 * DNS option code.
 * 
 * @author Arthur van Hoff, Pierre Frisch, Rick Blair
 */
public enum DNSOptionCode {

    /**
     * Token
     */
    Unknown("Unknown", 65535),
    /**
     * Long-Lived Queries Option [...]
     */
    LLQ("LLQ", 1),
    /**
     * Update Leases Option [...]
     */
    UL("UL", 2),
    /**
     * Name Server Identifier Option [RFC5001]
     */
    NSID("NSID", 3),
    /**
     * Owner Option [draft-cheshire-edns0-owner-option]
     */
    Owner("Owner", 4);

    private final String externalName;

    private final int indexValue;

    DNSOptionCode(String name, int index) {
        externalName = name;
        indexValue = 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 indexValue;
    }

    /**
     * @param code the option code
     * @return label
     */
    public static DNSOptionCode resultCodeForFlags(int code) {
        for (DNSOptionCode optionCode : DNSOptionCode.values()) {
            if (optionCode.indexValue == code) return optionCode;
        }
        return Unknown;
    }

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

}