/**
* 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.DataByteArrayInputStream;
import org.fusesource.hawtbuf.DataByteArrayOutputStream;
import org.fusesource.mqtt.client.QoS;
import org.fusesource.mqtt.client.Topic;
import java.io.IOException;
import java.net.ProtocolException;
import java.util.ArrayList;
import java.util.Arrays;
import static org.fusesource.mqtt.codec.MessageSupport.*;
/**
* <p>
* </p>
*
* @author <a href="http://hiramchirino.com">Hiram Chirino</a>
*/
public class SUBSCRIBE extends MessageSupport.HeaderBase implements Message, Acked {
public static final byte TYPE = 8;
public static final Topic[] NO_TOPICS = new Topic[0];
private short messageId;
private Topic topics[] = NO_TOPICS;
public SUBSCRIBE() {
qos(QoS.AT_LEAST_ONCE);
}
public byte messageType() {
return TYPE;
}
public SUBSCRIBE decode(MQTTFrame frame) throws ProtocolException {
assert(frame.buffers.length == 1);
header(frame.header());
DataByteArrayInputStream is = new DataByteArrayInputStream(frame.buffers[0]);
QoS qos = qos();
if(qos != QoS.AT_MOST_ONCE) {
messageId = is.readShort();
}
ArrayList<Topic> list = new ArrayList<Topic>();
while(is.available() > 0) {
Topic topic = new Topic(MessageSupport.readUTF(is), QoS.values()[is.readByte()]);
list.add(topic);
}
topics = list.toArray(new Topic[list.size()]);
return this;
}
public MQTTFrame encode() {
try {
DataByteArrayOutputStream os = new DataByteArrayOutputStream();
QoS qos = qos();
if(qos != QoS.AT_MOST_ONCE) {
os.writeShort(messageId);
}
for(Topic topic: topics) {
MessageSupport.writeUTF(os, topic.name());
os.writeByte(topic.qos().ordinal());
}
MQTTFrame frame = new MQTTFrame();
frame.header(header());
frame.commandType(TYPE);
return frame.buffer(os.toBuffer());
} catch (IOException e) {
throw new RuntimeException("The impossible happened");
}
}
@Override
public boolean dup() {
return super.dup();
}
@Override
public SUBSCRIBE dup(boolean dup) {
return (SUBSCRIBE) super.dup(dup);
}
@Override
public QoS qos() {
return super.qos();
}
public short messageId() {
return messageId;
}
public SUBSCRIBE messageId(short messageId) {
this.messageId = messageId;
return this;
}
public Topic[] topics() {
return topics;
}
public SUBSCRIBE topics(Topic[] topics) {
this.topics = topics;
return this;
}
@Override
public String toString() {
return "SUBSCRIBE{" +
"dup=" + dup() +
", qos=" + qos() +
", messageId=" + messageId +
", topics=" + (topics == null ? null : Arrays.asList(topics)) +
'}';
}
}