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Advanced and thread-safe Java Redis client for synchronous, asynchronous, and reactive usage. Supports Cluster, Sentinel, Pipelining, Auto-Reconnect, Codecs and much more.

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/*
 * Copyright 2011-Present, Redis Ltd. and Contributors
 * All rights reserved.
 *
 * Licensed under the MIT License.
 *
 * This file contains contributions from third-party contributors
 * 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
 *
 *      https://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.lettuce.core.output;

import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.List;

import io.lettuce.core.codec.RedisCodec;
import io.lettuce.core.codec.StringCodec;
import io.lettuce.core.internal.LettuceFactories;

/**
 * {@link List} of flat arrays, possibly deeply nested. Decodes simple strings through {@link StringCodec#UTF8}.
 *
 * @param  Key type.
 * @param  Value type.
 * @author Will Glozer
 * @author Mark Paluch
 * @author Julien Ruaux
 */
public class NestedMultiOutput extends CommandOutput> {

    private final Deque> stack;

    private int depth;

    private boolean initialized;

    public NestedMultiOutput(RedisCodec codec) {
        super(codec, Collections.emptyList());
        stack = LettuceFactories.newSpScQueue();
        depth = 0;
    }

    @Override
    public void set(long integer) {

        if (!initialized) {
            output = new ArrayList<>();
        }

        output.add(integer);
    }

    @Override
    public void set(double number) {

        if (!initialized) {
            output = new ArrayList<>();
        }

        output.add(number);
    }

    @Override
    public void set(ByteBuffer bytes) {

        if (!initialized) {
            output = new ArrayList<>();
        }

        output.add(bytes == null ? null : codec.decodeValue(bytes));
    }

    @Override
    public void setSingle(ByteBuffer bytes) {

        if (!initialized) {
            output = new ArrayList<>();
        }

        output.add(bytes == null ? null : StringCodec.UTF8.decodeValue(bytes));
    }

    @Override
    public void complete(int depth) {
        if (depth > 0 && depth < this.depth) {
            output = stack.pop();
            this.depth--;
        }
    }

    @Override
    public void multi(int count) {

        if (!initialized) {
            output = OutputFactory.newList(Math.max(1, count));
            initialized = true;
        }

        List