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<?php

namespace Greg\Orm\Connection;

use Greg\Orm\Clause\FromClause;

use Greg\Orm\Clause\GroupByClause;

use Greg\Orm\Clause\HavingClause;

use Greg\Orm\Clause\JoinClause;

use Greg\Orm\Clause\LimitClause;

use Greg\Orm\Clause\OffsetClause;

use Greg\Orm\Clause\OrderByClause;

use Greg\Orm\Clause\WhereClause;

use Greg\Orm\Query\DeleteQuery;

use Greg\Orm\Query\InsertQuery;

use Greg\Orm\Query\SelectQuery;

use Greg\Orm\Query\UpdateQuery;

abstract class ConnectionAbstract implements ConnectionStrategy

{

/**

* @var callable[]

*/

private $listeners = [];

/**

* @param callable $callable

*

* @return $this

*/

public function listen(callable $callable)

{

$this->listeners[] = $callable;

return $this;

}

/**

* @return SelectQuery

*/

public function select(): SelectQuery

{

return new SelectQuery($this->dialect(), $this);

}

/**

* @return InsertQuery

*/

public function insert(): InsertQuery

{

return new InsertQuery($this->dialect(), $this);

}

/**

* @return DeleteQuery

*/

public function delete(): DeleteQuery

{

return new DeleteQuery($this->dialect(), $this);

}

/**

* @return UpdateQuery

*/

public function update(): UpdateQuery

{

return new UpdateQuery($this->dialect(), $this);

}

/**

* @return FromClause

*/

public function from(): FromClause

{

return new FromClause($this->dialect());

}

/**

* @return JoinClause

*/

public function join(): JoinClause

{

return new JoinClause($this->dialect());

}

/**

* @return WhereClause

*/

public function where(): WhereClause

{

return new WhereClause($this->dialect());

}

/**

* @return HavingClause

*/

public function having(): HavingClause

{

return new HavingClause($this->dialect());

}

/**

* @return OrderByClause

*/

public function orderBy(): OrderByClause

{

return new OrderByClause($this->dialect());

}

/**

* @return GroupByClause

*/

public function groupBy(): GroupByClause

{

return new GroupByClause($this->dialect());

}

/**

* @return LimitClause

*/

public function limit(): LimitClause

{

return new LimitClause($this->dialect());

}

/**

* @return OffsetClause

*/

public function offset(): OffsetClause

{

return new OffsetClause($this->dialect());

}

/**

* @param string $sql

* @param array $params

*

* @return $this

*/

protected function fire(string $sql, array $params = [])

{

foreach ($this->listeners as $listener) {

call_user_func_array($listener, [$sql, $params, $this]);

}

return $this;

}

abstract public function describe(string $tableName): array;

}