/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.codec.mqtt;

import static java.util.Objects.requireNonNull;

import io.netty.util.internal.StringUtil;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Payload of the {@link MqttSubAckMessage}
 */
public class MqttSubAckPayload {

    private final List<Integer> grantedQoSLevels;

    public MqttSubAckPayload(int... grantedQoSLevels) {
        requireNonNull(grantedQoSLevels, "grantedQoSLevels");

        List<Integer> list = new ArrayList<>(grantedQoSLevels.length);
        for (int v: grantedQoSLevels) {
            list.add(v);
        }
        this.grantedQoSLevels = Collections.unmodifiableList(list);
    }

    public MqttSubAckPayload(Iterable<Integer> grantedQoSLevels) {
        requireNonNull(grantedQoSLevels, "grantedQoSLevels");
        List<Integer> list = new ArrayList<>();
        for (Integer v: grantedQoSLevels) {
            if (v == null) {
                break;
            }
            list.add(v);
        }
        this.grantedQoSLevels = Collections.unmodifiableList(list);
    }

    public List<Integer> grantedQoSLevels() {
        return grantedQoSLevels;
    }

    @Override
    public String toString() {
        return new StringBuilder(StringUtil.simpleClassName(this))
            .append('[')
            .append("grantedQoSLevels=").append(grantedQoSLevels)
            .append(']')
            .toString();
    }
}