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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\db;
use yii\base\InvalidConfigException;
/**
* Class JsonExpression represents data that should be encoded to JSON.
*
* For example:
*
* ```php
* new JsonExpression(['a' => 1, 'b' => 2]); // will be encoded to '{"a": 1, "b": 2}'
* ```
*
* @author Dmytro Naumenko <d.naumenko.a@gmail.com>
* @since 2.0.14
*/
class JsonExpression implements ExpressionInterface, \JsonSerializable
{
const TYPE_JSON = 'json';
const TYPE_JSONB = 'jsonb';
/**
* @var mixed the value to be encoded to JSON.
* The value must be compatible with [\yii\helpers\Json::encode()|Json::encode()]] input requirements.
*/
protected $value;
/**
* @var string|null Type of JSON, expression should be casted to. Defaults to `null`, meaning
* no explicit casting will be performed.
* This property will be encountered only for DBMSs that support different types of JSON.
* For example, PostgreSQL has `json` and `jsonb` types.
*/
protected $type;
/**
* JsonExpression constructor.
*
* @param mixed $value the value to be encoded to JSON.
* The value must be compatible with [\yii\helpers\Json::encode()|Json::encode()]] requirements.
* @param string|null $type the type of the JSON. See [[JsonExpression::type]]
*
* @see type
*/
public function __construct($value, $type = null)
{
if ($value instanceof self) {
$value = $value->getValue();
}
$this->value = $value;
$this->type = $type;
}
/**
* @return mixed
* @see value
*/
public function getValue()
{
return $this->value;
}
/**
* @return null|string the type of JSON
* @see type
*/
public function getType()
{
return $this->type;
}
/**
* Specify data which should be serialized to JSON
*
* @link https://secure.php.net/manual/en/jsonserializable.jsonserialize.php
* @return mixed data which can be serialized by <b>json_encode</b>,
* which is a value of any type other than a resource.
* @since 2.0.14.2
* @throws InvalidConfigException when JsonExpression contains QueryInterface object
*/
public function jsonSerialize()
{
$value = $this->getValue();
if ($value instanceof QueryInterface) {
throw new InvalidConfigException('The JsonExpression class can not be serialized to JSON when the value is a QueryInterface object');
}
return $value;
}
}