52 lines
1.5 KiB
Java
52 lines
1.5 KiB
Java
/*
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* Copyright (c) 2012-2017 The original author or authors
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* ------------------------------------------------------
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* and Apache License v2.0 which accompanies this distribution.
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*
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* The Eclipse Public License is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* The Apache License v2.0 is available at
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* http://www.opensource.org/licenses/apache2.0.php
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*
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* You may elect to redistribute this code under either of these licenses.
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*/
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package io.moquette.spi.impl;
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import io.netty.buffer.ByteBuf;
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import io.netty.handler.codec.mqtt.MqttMessage;
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import io.netty.handler.codec.mqtt.MqttMessageIdVariableHeader;
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import java.util.Map;
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/**
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* Utility static methods, like Map get with default value, or elvis operator.
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*/
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public final class Utils {
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public static <T, K> T defaultGet(Map<K, T> map, K key, T defaultValue) {
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T value = map.get(key);
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if (value != null) {
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return value;
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}
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return defaultValue;
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}
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public static int messageId(MqttMessage msg) {
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return ((MqttMessageIdVariableHeader) msg.variableHeader()).messageId();
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}
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public static byte[] readBytesAndRewind(ByteBuf payload) {
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byte[] payloadContent = new byte[payload.readableBytes()];
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int mark = payload.readerIndex();
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payload.readBytes(payloadContent);
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payload.readerIndex(mark);
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return payloadContent;
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}
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private Utils() {
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}
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}
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