<?php

/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. 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.
 */

declare(strict_types=1);

namespace Elastic\Apm\Impl\Config;

/**
 * Code in this file is part of implementation internals and thus it is not covered by the backward compatibility.
 *
 * @internal
 */
final class CompositeRawSnapshot implements RawSnapshotInterface
{
    /** @var array<RawSnapshotInterface> */
    private $subSnapshots;

    /**
     * @param array<RawSnapshotInterface> $subSnapshots
     */
    public function __construct(array $subSnapshots)
    {
        $this->subSnapshots = $subSnapshots;
    }

    public function valueFor(string $optionName): ?string
    {
        foreach ($this->subSnapshots as $subSnapshot) {
            if (($value = $subSnapshot->valueFor($optionName)) !== null) {
                return $value;
            }
        }
        return null;
    }
}