io.moquette.broker.Utils Maven / Gradle / Ivy
/*
* Copyright (c) 2012-2018 The original author or authors
* ------------------------------------------------------
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Apache License v2.0 which accompanies this distribution.
*
* The Eclipse Public License is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* The Apache License v2.0 is available at
* http://www.opensource.org/licenses/apache2.0.php
*
* You may elect to redistribute this code under either of these licenses.
*/
package io.moquette.broker;
import io.netty.buffer.ByteBuf;
import io.netty.handler.codec.mqtt.MqttMessage;
import io.netty.handler.codec.mqtt.MqttMessageIdVariableHeader;
import java.util.Map;
/**
* Utility static methods, like Map get with default value, or elvis operator.
*/
public final class Utils {
public static T defaultGet(Map map, K key, T defaultValue) {
T value = map.get(key);
if (value != null) {
return value;
}
return defaultValue;
}
public static int messageId(MqttMessage msg) {
return ((MqttMessageIdVariableHeader) msg.variableHeader()).messageId();
}
public static byte[] readBytesAndRewind(ByteBuf payload) {
byte[] payloadContent = new byte[payload.readableBytes()];
int mark = payload.readerIndex();
payload.readBytes(payloadContent);
payload.readerIndex(mark);
return payloadContent;
}
private Utils() {
}
}