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mqtt-client provides an ASL 2.0 licensed API to MQTT. It takes care of automatically reconnecting to your MQTT server and restoring your client session if any network failures occur. Applications can use a blocking API style, a futures based API, or a callback/continuations passing API style.

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/**
 * Copyright (C) 2010-2012, FuseSource Corp.  All rights reserved.
 *
 *     http://fusesource.com
 *
 * 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 org.fusesource.mqtt.codec;

import org.fusesource.hawtbuf.Buffer;
import org.fusesource.mqtt.client.QoS;

/**
* 
* 
*
* @author Hiram Chirino
*/
public class MQTTFrame extends MessageSupport.HeaderBase {

    private static final Buffer[] NO_BUFFERS = new Buffer[0];

    public Buffer[] buffers = NO_BUFFERS;

    public MQTTFrame() {
    }
    public MQTTFrame( Buffer buffer) {
        this(new Buffer[]{buffer});
    }
    public MQTTFrame( Buffer[] buffers) {
        this.buffers = buffers;
    }

    public Buffer[] buffers() {
        return buffers;
    }
    public MQTTFrame buffers(Buffer...buffers) {
        this.buffers = buffers;
        return this;
    }

    public MQTTFrame buffer(Buffer buffer) {
        this.buffers = new Buffer[]{buffer};
        return this;
    }

    @Override
    public byte header() {
        return super.header();
    }

    @Override
    public MQTTFrame header(byte header) {
        return (MQTTFrame)super.header(header);
    }

    @Override
    public byte messageType() {
        return super.messageType();
    }

    @Override
    public MQTTFrame commandType(int type) {
        return (MQTTFrame)super.commandType(type);
    }

    @Override
    public boolean dup() {
        return super.dup();
    }

    @Override
    public MQTTFrame dup(boolean dup) {
        return (MQTTFrame) super.dup(dup);
    }

    @Override
    public QoS qos() {
        return super.qos();
    }

    @Override
    public MQTTFrame qos(QoS qos) {
        return (MQTTFrame) super.qos(qos);
    }

    @Override
    public boolean retain() {
        return super.retain();
    }

    @Override
    public MQTTFrame retain(boolean retain) {
        return (MQTTFrame) super.retain(retain);
    }

    @Override
    public String toString() {
        String type = "unknown";
        switch(messageType()) {
            case CONNECT.TYPE:
                type = "CONNECT";
                break;
            case CONNACK.TYPE:
                type = "CONNACK";
                break;
            case DISCONNECT.TYPE:
                type = "DISCONNECT";
                break;
            case PINGREQ.TYPE:
                type = "PINGREQ";
                break;
            case PINGRESP.TYPE:
                type = "PINGRESP";
                break;
            case SUBSCRIBE.TYPE:
                type = "SUBSCRIBE";
                break;
            case UNSUBSCRIBE.TYPE:
                type = "UNSUBSCRIBE";
                break;
            case UNSUBACK.TYPE:
                type = "UNSUBACK";
                break;
            case PUBLISH.TYPE:
                type = "PUBLISH";
                break;
            case SUBACK.TYPE:
                type = "SUBACK";
                break;
            case PUBACK.TYPE:
                type = "PUBACK";
                break;
            case PUBREC.TYPE:
                type = "PUBREC";
                break;
            case PUBREL.TYPE:
                type = "PUBREL";
                break;
            case PUBCOMP.TYPE:
                type = "PUBCOMP";
                break;
            default:
        }

        return "MQTTFrame { type: "+type+", qos: "+qos()+", dup:"+dup()+" }";
    }
}