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Filename : Metadata.php
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<?php

declare(strict_types=1);

namespace MaxMind\Db\Reader;

use ArgumentCountError;

/**
 * This class provides the metadata for the MaxMind DB file.
 */
class Metadata
{
    /**
     * This is an unsigned 16-bit integer indicating the major version number
     * for the database's binary format.
     *
     * @var int
     */
    public $binaryFormatMajorVersion;
    /**
     * This is an unsigned 16-bit integer indicating the minor version number
     * for the database's binary format.
     *
     * @var int
     */
    public $binaryFormatMinorVersion;
    /**
     * This is an unsigned 64-bit integer that contains the database build
     * timestamp as a Unix epoch value.
     *
     * @var int
     */
    public $buildEpoch;
    /**
     * This is a string that indicates the structure of each data record
     * associated with an IP address.  The actual definition of these
     * structures is left up to the database creator.
     *
     * @var string
     */
    public $databaseType;
    /**
     * This key will always point to a map (associative array). The keys of
     * that map will be language codes, and the values will be a description
     * in that language as a UTF-8 string. May be undefined for some
     * databases.
     *
     * @var array
     */
    public $description;
    /**
     * This is an unsigned 16-bit integer which is always 4 or 6. It indicates
     * whether the database contains IPv4 or IPv6 address data.
     *
     * @var int
     */
    public $ipVersion;
    /**
     * An array of strings, each of which is a language code. A given record
     * may contain data items that have been localized to some or all of
     * these languages. This may be undefined.
     *
     * @var array
     */
    public $languages;
    /**
     * @var int
     */
    public $nodeByteSize;
    /**
     * This is an unsigned 32-bit integer indicating the number of nodes in
     * the search tree.
     *
     * @var int
     */
    public $nodeCount;
    /**
     * This is an unsigned 16-bit integer. It indicates the number of bits in a
     * record in the search tree. Note that each node consists of two records.
     *
     * @var int
     */
    public $recordSize;
    /**
     * @var int
     */
    public $searchTreeSize;

    public function __construct(array $metadata)
    {
        if (\func_num_args() !== 1) {
            throw new ArgumentCountError(
                sprintf('%s() expects exactly 1 parameter, %d given', __METHOD__, \func_num_args())
            );
        }

        $this->binaryFormatMajorVersion =
            $metadata['binary_format_major_version'];
        $this->binaryFormatMinorVersion =
            $metadata['binary_format_minor_version'];
        $this->buildEpoch = $metadata['build_epoch'];
        $this->databaseType = $metadata['database_type'];
        $this->languages = $metadata['languages'];
        $this->description = $metadata['description'];
        $this->ipVersion = $metadata['ip_version'];
        $this->nodeCount = $metadata['node_count'];
        $this->recordSize = $metadata['record_size'];
        $this->nodeByteSize = $this->recordSize / 4;
        $this->searchTreeSize = $this->nodeCount * $this->nodeByteSize;
    }
}