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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.auth;

import com.hivemq.client.internal.mqtt.datatypes.MqttUtf8StringImpl;
import com.hivemq.client.internal.mqtt.util.MqttChecks;
import com.hivemq.client.internal.util.Checks;
import com.hivemq.client.mqtt.datatypes.MqttUtf8String;
import com.hivemq.client.mqtt.mqtt5.message.auth.Mqtt5SimpleAuthBuilder;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.nio.ByteBuffer;
import java.util.function.Function;

/**
 * @author Silvio Giebl
 */
public abstract class MqttSimpleAuthBuilder> {

    private @Nullable MqttUtf8StringImpl username;
    private @Nullable ByteBuffer password;

    abstract @NotNull B self();

    public @NotNull B username(final @Nullable String username) {
        this.username = MqttUtf8StringImpl.of(username, "Username");
        return self();
    }

    public @NotNull B username(final @Nullable MqttUtf8String username) {
        this.username = MqttChecks.string(username, "Username");
        return self();
    }

    public @NotNull B password(final byte @Nullable [] password) {
        this.password = MqttChecks.binaryData(password, "Password");
        return self();
    }

    public @NotNull B password(final @Nullable ByteBuffer password) {
        this.password = MqttChecks.binaryData(password, "Password");
        return self();
    }

    public @NotNull MqttSimpleAuth build() {
        Checks.state((username != null) || (password != null), "Either user name or password must be given.");
        return new MqttSimpleAuth(username, password);
    }

    public static class Default extends MqttSimpleAuthBuilder implements Mqtt5SimpleAuthBuilder.Complete {

        @Override
        @NotNull Default self() {
            return this;
        }
    }

    public static class Nested extends MqttSimpleAuthBuilder>
            implements Mqtt5SimpleAuthBuilder.Nested.Complete
 {

        private final @NotNull Function parentConsumer;

        public Nested(final @NotNull Function parentConsumer) {
            this.parentConsumer = parentConsumer;
        }

        @Override
        @NotNull Nested self() {
            return this;
        }

        @Override
        public @NotNull P applySimpleAuth() {
            return parentConsumer.apply(build());
        }
    }
}