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GenericMqttSubscribe.java
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GenericMqttSubscribe.java
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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.connectivity.service.messaging.mqtt.hivemq.subscribing;
import java.util.LinkedHashSet;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Stream;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.base.model.common.ConditionChecker;
import com.hivemq.client.mqtt.mqtt3.message.subscribe.Mqtt3Subscribe;
import com.hivemq.client.mqtt.mqtt5.message.subscribe.Mqtt5Subscribe;
/**
* Generic representation of an MQTT Subscribe message of protocol versions 3 and 5.
*/
@Immutable
final class GenericMqttSubscribe {
private final LinkedHashSet<GenericMqttSubscription> genericMqttSubscriptions;
private GenericMqttSubscribe(final Set<GenericMqttSubscription> genericMqttSubscriptions) {
this.genericMqttSubscriptions = new LinkedHashSet<>(genericMqttSubscriptions);
}
/**
* Returns an instance of {@code GenericMqttSubscribe} for the specified MQTT subscriptions.
*
* @param genericMqttSubscriptions the subscriptions of the returned Subscribe message. The set must contain at
* least one subscription.
* @return the instance.
* @throws NullPointerException if any argument is {@code null}.
* @throws IllegalArgumentException if {@code genericMqttSubscriptions} is empty.
*/
static GenericMqttSubscribe of(final Set<GenericMqttSubscription> genericMqttSubscriptions) {
return new GenericMqttSubscribe(ConditionChecker.argumentNotEmpty(genericMqttSubscriptions,
"genericMqttSubscriptions"));
}
/**
* Returns a stream of the subscriptions of this Subscribe message.
*
* @return a stream of the subscriptions of this Subscribe message.
*/
Stream<GenericMqttSubscription> genericMqttSubscriptions() {
return genericMqttSubscriptions.stream();
}
/**
* Returns this Subscribe message as {@link Mqtt3Subscribe}.
*
* @return this Subscribe message as {@link Mqtt3Subscribe}.
*/
Mqtt3Subscribe getAsMqtt3Subscribe() {
return Mqtt3Subscribe.builder()
.addSubscriptions(genericMqttSubscriptions().map(GenericMqttSubscription::getAsMqtt3Subscription))
.build();
}
/**
* Returns this Subscribe message as {@link Mqtt5Subscribe}.
*
* @return this Subscribe message as {@link Mqtt5Subscribe}.
*/
Mqtt5Subscribe getAsMqtt5Subscribe() {
return Mqtt5Subscribe.builder()
.addSubscriptions(genericMqttSubscriptions().map(GenericMqttSubscription::getAsMqtt5Subscription))
.build();
}
@Override
public boolean equals(@Nullable final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final var that = (GenericMqttSubscribe) o;
return Objects.equals(genericMqttSubscriptions, that.genericMqttSubscriptions);
}
@Override
public int hashCode() {
return Objects.hash(genericMqttSubscriptions);
}
}