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<?php namespace Silber\Bouncer\Constraints; use Silber\Bouncer\Helpers; use InvalidArgumentException; use Illuminate\Database\Eloquent\Model; abstract class Constraint implements Constrainer { /** * The operator to use for the comparison. * * @var string / protected $operator; /* * The logical operator to use when checked after a previous constaint. * * @var string / protected $logicalOperator = 'and'; /* * Determine whether the given entity/authority passes this constraint. * * @param \Illuminate\Database\Eloquent\Model $entity * @param \Illuminate\Database\Eloquent\Model\|null $authority * @return bool / abstract public function check(Model $entity, Model $authority = null); /* * Create a new constraint for where a column matches the given value. * * @param string $column * @param mixed $operator * @param mixed $value * @return \Silber\Bouncer\Constraints\ValueConstraint / public static function where($column, $operator, $value = null) { list($operator, $value) = static::prepareOperatorAndValue( $operator, $value, func_num_args() === 2 ); return new ValueConstraint($column, $operator, $value); } /* * Create a new constraint for where a column matches the given value, * with the logical operator set to "or". * * @param string $column * @param mixed $operator * @param mixed $value * @return \Silber\Bouncer\Constraints\ValueConstraint / public static function orWhere($column, $operator, $value = null) { return static::where(...func_get_args())->logicalOperator('or'); } /* * Create a new constraint for where a column matches the given column on the authority. * * @param string $a * @param mixed $operator * @param mixed $b * @return \Silber\Bouncer\Constraints\ColumnConstraint / public static function whereColumn($a, $operator, $b = null) { list($operator, $b) = static::prepareOperatorAndValue( $operator, $b, func_num_args() === 2 ); return new ColumnConstraint($a, $operator, $b); } /* * Create a new constraint for where a column matches the given column on the authority, * with the logical operator set to "or". * * @param string $a * @param mixed $operator * @param mixed $b * @return \Silber\Bouncer\Constraints\ColumnConstraint / public static function orWhereColumn($a, $operator, $b = null) { return static::whereColumn(...func_get_args())->logicalOperator('or'); } /* * Set the logical operator to use when checked after a previous constraint. * * @param string\|null $operator * @return $this\|string / public function logicalOperator($operator = null) { if (is_null($operator)) { return $this->logicalOperator; } Helpers::ensureValidLogicalOperator($operator); $this->logicalOperator = $operator; return $this; } /* * Checks whether the logical operator is an "and" operator. * * @param string $operator / public function isAnd() { return $this->logicalOperator == 'and'; } /* * Checks whether the logical operator is an "and" operator. * * @param string $operator / public function isOr() { return $this->logicalOperator == 'or'; } /* * Determine whether the given constrainer is equal to this object. * * @param \Silber\Bouncer\Constraints\Constrainer $constrainer * @return bool / public function equals(Constrainer $constrainer) { if (! $constrainer instanceof static) { return false; } return $this->data()['params'] == $constrainer->data()['params']; } /* * Prepare the value and operator. * * @param string $operator * @param string $value * @param bool $usesDefault * @return array * * @throws \InvalidArgumentException / protected static function prepareOperatorAndValue($operator, $value, $usesDefault) { if ($usesDefault) { return ['=', $operator]; } if (! in_array($operator, ['=', '==', '!=', '<', '>', '<=', '>='])) { throw new InvalidArgumentException("{$operator} is not a valid operator"); } return [$operator, $value]; } /* * Compare the two values by the constraint's operator. * * @param mixed $a * @param mixed $b * @return bool */ protected function compare($a, $b) { switch ($this->operator) { case '=': case '==': return $a == $b; case '!=': return $a != $b; case '<': return $a < $b; case '>': return $a > $b; case '<=': return $a <= $b; case '>=': return $a >= $b; } } }

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