1: <?php
  2: /**
  3:  * Pinoco: makes existing static web site dynamic transparently.
  4:  * Copyright 2010-2012, Hisateru Tanaka <tanakahisateru@gmail.com>
  5:  *
  6:  * Licensed under The MIT License
  7:  * Redistributions of files must retain the above copyright notice.
  8:  *
  9:  * PHP Version 5
 10:  *
 11:  * @author     Hisateru Tanaka <tanakahisateru@gmail.com>
 12:  * @copyright  Copyright 2010-2012, Hisateru Tanaka <tanakahisateru@gmail.com>
 13:  * @license    MIT License (http://www.opensource.org/licenses/mit-license.php)
 14:  * @package    Pinoco
 15:  */
 16: 
 17: /**
 18:  * Special Variable model as Nothing object.
 19:  *
 20:  * @package Pinoco
 21:  */
 22: class Pinoco_NothingVars extends Pinoco_Vars
 23: {
 24:     private static $_instance = null;
 25: 
 26:     /**
 27:      * Provides the unique Nothing instance.
 28:      *
 29:      * @return Pinoco_NothingVars
 30:      */
 31:     public static function instance()
 32:     {
 33:         if (self::$_instance === null) {
 34:             self::$_instance = new self;
 35:         }
 36:         return self::$_instance;
 37:     }
 38: 
 39:     /**
 40:      * Returns itself as globally unique NothingVars.
 41:      *
 42:      * @param string $name
 43:      * @param mixed $default
 44:      * @return Pinoco_NothingVars
 45:      */
 46:     public function get($name, $default=Pinoco_OptionalParam::UNSPECIFIED)
 47:     {
 48:         return $this;
 49:     }
 50: 
 51:     /**
 52:      * Nothing can respond to any names.
 53:      *
 54:      * @param string $name
 55:      * @return bool
 56:      */
 57:     public function has($name)
 58:     {
 59:         return true;
 60:     }
 61: 
 62:     /**
 63:      * Every values passed to Nothing would be lost.
 64:      *
 65:      * @param string $name
 66:      * @param mixed $value
 67:      * @return void
 68:      */
 69:     public function set($name, $value)
 70:     {
 71:     }
 72: 
 73:     /**
 74:      * Every values passed to Nothing would be lost.
 75:      *
 76:      * @param string $name
 77:      * @param callback $callable
 78:      * @return void
 79:      */
 80:     public function registerAsMethod($name, $callable)
 81:     {
 82:         //$this->set[$name] = new Pinoco_MethodProxy($callable, $this);
 83:     }
 84: 
 85:     /**
 86:      * Every values passed to Nothing would be lost.
 87:      *
 88:      * @param string $name
 89:      * @param callback $callable
 90:      * @param array $context
 91:      * @return void
 92:      */
 93:     public function registerAsDynamic($name, $callable, $context=array())
 94:     {
 95:     }
 96: 
 97:     /**
 98:      * Every values passed to Nothing would be lost.
 99:      *
100:      * @param string $name
101:      * @param callback $callable
102:      * @param array $context
103:      * @return void
104:      */
105:     public function registerAsLazy($name, $callable, $context=array())
106:     {
107:     }
108: 
109:     /**
110:      * Every values passed to Nothing would be lost.
111:      *
112:      * @param mixed $src
113:      * @param bool $filter
114:      * @param null $default
115:      * @param string $modifier
116:      * @return void
117:      */
118:     public function import($src, $filter=false, $default=null, $modifier="%s")
119:     {
120:     }
121: 
122:     /**
123:      * Nothing as Array is empty array.
124:      *
125:      * @param bool $filter
126:      * @param null $default
127:      * @param string $modifier
128:      * @return array
129:      */
130:     public function toArray($filter=false, $default=null, $modifier="%s")
131:     {
132:         return array();
133:     }
134: 
135:     /**
136:      * Nothing as Array is empty array.
137:      *
138:      * @param int $depth
139:      * @return array
140:      */
141:     public function toArrayRecurse($depth=null)
142:     {
143:         return array();
144:     }
145: 
146:     /**
147:      * Nothing as String is empty string.
148:      *
149:      * @return string
150:      */
151:     public function __toString()
152:     {
153:         return "";
154:     }
155: }
156: