/*
* Copyright 2014 The Netty Project
*
* The Netty Project licenses this file to you 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 io.netty.handler.codec.mqtt;
import io.netty.util.internal.StringUtil;
/**
* Variable Header containing only Message Id
* See <a href="http://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html#msg-id">MQTTV3.1/msg-id</a>
*/
public final class MqttMessageIdVariableHeader {
private final int messageId;
public static MqttMessageIdVariableHeader from(int messageId) {
if (messageId < 1 || messageId > 0xffff) {
throw new IllegalArgumentException("messageId: " + messageId + " (expected: 1 ~ 65535)");
}
return new MqttMessageIdVariableHeader(messageId);
}
private MqttMessageIdVariableHeader(int messageId) {
this.messageId = messageId;
}
public int messageId() {
return messageId;
}
@Override
public String toString() {
return new StringBuilder(StringUtil.simpleClassName(this))
.append('[')
.append("messageId=").append(messageId)
.append(']')
.toString();
}
}