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<?php
namespace MongoDB\Model;
use BSON\Serializable;
use MongoDB\Exception\InvalidArgumentException;
use MongoDB\Exception\UnexpectedTypeException;
/**
* Index input model class.
*
* This class is used to validate user input for index creation.
*
* @internal
* @see MongoDB\Collection::createIndexes()
* @see https://github.com/mongodb/specifications/blob/master/source/enumerate-indexes.rst
* @see http://docs.mongodb.org/manual/reference/method/db.collection.createIndex/
*/
class IndexInput implements Serializable
{
private $index;
/**
* Constructor.
*
* @param array $index Index specification
*/
public function __construct(array $index)
{
if ( ! isset($index['key'])) {
throw new InvalidArgumentException('Required "key" document is missing from index specification');
}
if ( ! is_array($index['key']) && ! is_object($index['key'])) {
throw new UnexpectedTypeException($index['key'], 'array or object');
}
foreach ($index['key'] as $order) {
if ( ! is_int($order) && ! is_float($order) && ! is_string($order)) {
throw new UnexpectedTypeException($order, 'numeric or string');
}
}
if ( ! isset($index['ns'])) {
throw new InvalidArgumentException('Required "ns" option is missing from index specification');
}
if ( ! is_string($index['ns'])) {
throw new UnexpectedTypeException($index['ns'], 'string');
}
if ( ! isset($index['name'])) {
$index['name'] = $this->generateName($index['key']);
}
if ( ! is_string($index['name'])) {
throw new UnexpectedTypeException($index['name'], 'string');
}
$this->index = $index;
}
/**
* Return the index name.
*
* @param string
*/
public function __toString()
{
return $this->index['name'];
}
/**
* Serialize the index information to BSON for index creation.
*
* @see MongoDB\Collection::createIndexes()
* @see http://php.net/bson-serializable.bsonserialize
*/
public function bsonSerialize()
{
return $this->index;
}
/**
* Generates an index name from its key specification.
*
* @param array|object $key Document containing fields mapped to values,
* which denote order or an index type
* @return string
*/
private function generateName($key)
{
$name = '';
foreach ($key as $field => $type) {
$name .= ($name != '' ? '_' : '') . $field . '_' . $type;
}
return $name;
}
}