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HiveMQ MQTT Client is an MQTT 5.0 and MQTT 3.1.1 compatible and feature-rich high-performance Java client library with different API flavours and backpressure support

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/*
 * Copyright 2018-present HiveMQ and the HiveMQ Community
 *
 * 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 com.hivemq.client.internal.mqtt.message.subscribe;

import com.hivemq.client.annotations.Immutable;
import com.hivemq.client.internal.mqtt.message.MqttStatefulMessage;
import org.jetbrains.annotations.NotNull;

/**
 * @author Silvio Giebl
 */
@Immutable
public class MqttStatefulSubscribe extends MqttStatefulMessage.WithId {

    public static final int DEFAULT_NO_SUBSCRIPTION_IDENTIFIER = -1;

    private final int subscriptionIdentifier;

    MqttStatefulSubscribe(
            final @NotNull MqttSubscribe subscribe, final int packetIdentifier, final int subscriptionIdentifier) {

        super(subscribe, packetIdentifier);
        this.subscriptionIdentifier = subscriptionIdentifier;
    }

    public int getSubscriptionIdentifier() {
        return subscriptionIdentifier;
    }

    @Override
    protected @NotNull String toAttributeString() {
        return super.toAttributeString() + ((subscriptionIdentifier == DEFAULT_NO_SUBSCRIPTION_IDENTIFIER) ? "" :
                "subscriptionIdentifier=" + subscriptionIdentifier);
    }

    @Override
    public @NotNull String toString() {
        return "MqttStatefulSubscribe{" + toAttributeString() + '}';
    }
}