1: <?php
 2: /**
 3:  * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 4:  * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 5:  *
 6:  * Licensed under The MIT License
 7:  * For full copyright and license information, please see the LICENSE.txt
 8:  * Redistributions of files must retain the above copyright notice.
 9:  *
10:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
11:  * @link          https://cakephp.org CakePHP(tm) Project
12:  * @since         3.0.0
13:  * @license       https://opensource.org/licenses/mit-license.php MIT License
14:  */
15: namespace Cake\Database\Expression;
16: 
17: use Cake\Database\ExpressionInterface;
18: use Cake\Database\ValueBinder;
19: 
20: /**
21:  * Represents a single identifier name in the database.
22:  *
23:  * Identifier values are unsafe with user supplied data.
24:  * Values will be quoted when identifier quoting is enabled.
25:  *
26:  * @see \Cake\Database\Query::identifier()
27:  */
28: class IdentifierExpression implements ExpressionInterface
29: {
30:     /**
31:      * Holds the identifier string
32:      *
33:      * @var string
34:      */
35:     protected $_identifier;
36: 
37:     /**
38:      * Constructor
39:      *
40:      * @param string $identifier The identifier this expression represents
41:      */
42:     public function __construct($identifier)
43:     {
44:         $this->_identifier = $identifier;
45:     }
46: 
47:     /**
48:      * Sets the identifier this expression represents
49:      *
50:      * @param string $identifier The identifier
51:      * @return void
52:      */
53:     public function setIdentifier($identifier)
54:     {
55:         $this->_identifier = $identifier;
56:     }
57: 
58:     /**
59:      * Returns the identifier this expression represents
60:      *
61:      * @return string
62:      */
63:     public function getIdentifier()
64:     {
65:         return $this->_identifier;
66:     }
67: 
68:     /**
69:      * Converts the expression to its string representation
70:      *
71:      * @param \Cake\Database\ValueBinder $generator Placeholder generator object
72:      * @return string
73:      */
74:     public function sql(ValueBinder $generator)
75:     {
76:         return $this->_identifier;
77:     }
78: 
79:     /**
80:      * This method is a no-op, this is a leaf type of expression,
81:      * hence there is nothing to traverse
82:      *
83:      * @param callable $callable The callable to traverse with.
84:      * @return void
85:      */
86:     public function traverse(callable $callable)
87:     {
88:     }
89: }
90: