1: <?php
 2: 
 3: namespace Alchemy\core\query;
 4: use Alchemy\core\Element;
 5: 
 6: 
 7: /**
 8:  * Represent a JOIN clause
 9:  */
10: class Join extends Element implements IQueryFragment {
11:     const LEFT = 'LEFT';
12:     const RIGHT = 'RIGHT';
13:     const FULL = 'FULL';
14:     const INNER = 'INNER';
15:     const OUTER = 'OUTER';
16: 
17:     protected $direction;
18:     protected $type;
19:     protected $table;
20:     protected $on;
21: 
22: 
23:     /**
24:      * Object constructor
25:      *
26:      * @param string $direction Join::LEFT or Join::RIGHT
27:      * @param string $type Join::FULL, Join::INNER, or Join::OUTER
28:      * @param Table $table
29:      * @param Expression $on
30:      */
31:     public function __construct($direction, $type, TableRef $table, Expression $on = null) {
32:         $this->direction = $direction;
33:         $this->type = $type;
34:         $this->table = &$table;
35:         $this->on = &$on;
36:         $this->addTag("sql.compile", "Join");
37:     }
38: 
39: 
40:     /**
41:      * @return string
42:      */
43:     public function getDirection() {
44:         return $this->direction;
45:     }
46: 
47: 
48:     /**
49:      * @return Expression
50:      */
51:     public function getOn() {
52:         return $this->on;
53:     }
54: 
55: 
56:     /**
57:      * Recursively get all scalar parameters used by this clause
58:      * in the order which they are used in the expression
59:      *
60:      * @return array(Scalar, Scalar, ...)
61:      */
62:     public function parameters() {
63:         return $this->on->parameters();
64:     }
65: 
66: 
67:     /**
68:      * @return Table
69:      */
70:     public function getTable() {
71:         return $this->table;
72:     }
73: 
74: 
75:     /**
76:      * @return string
77:      */
78:     public function getType() {
79:         return $this->type;
80:     }
81: }
82: