1 | <?php |
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2 | /* |
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3 | File: xajaxPluginManager.inc.php |
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4 | |
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5 | Contains the xajax plugin manager. |
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6 | |
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7 | Title: xajax plugin manager |
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8 | |
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9 | Please see <copyright.inc.php> for a detailed description, copyright |
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10 | and license information. |
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11 | */ |
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12 | |
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13 | /* |
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14 | @package xajax |
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15 | @version $Id: xajaxPluginManager.inc.php 362 2007-05-29 15:32:24Z calltoconstruct $ |
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16 | @copyright Copyright (c) 2005-2006 by Jared White & J. Max Wilson |
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17 | @license http://www.xajaxproject.org/bsd_license.txt BSD License |
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18 | */ |
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19 | |
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20 | //SkipAIO |
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21 | require(dirname(__FILE__) . '/xajaxPlugin.inc.php'); |
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22 | //EndSkipAIO |
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23 | |
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24 | /* |
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25 | Class: xajaxPluginManager |
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26 | */ |
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27 | class xajaxPluginManager |
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28 | { |
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29 | /* |
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30 | Array: aRequestPlugins |
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31 | */ |
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32 | var $aRequestPlugins; |
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33 | |
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34 | /* |
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35 | Array: aResponsePlugins |
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36 | */ |
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37 | var $aResponsePlugins; |
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38 | |
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39 | /* |
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40 | Array: aConfigurable |
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41 | */ |
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42 | var $aConfigurable; |
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43 | |
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44 | /* |
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45 | Array: aRegistrars |
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46 | */ |
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47 | var $aRegistrars; |
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48 | |
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49 | /* |
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50 | Array: aProcessors |
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51 | */ |
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52 | var $aProcessors; |
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53 | |
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54 | /* |
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55 | Array: aClientScriptGenerators |
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56 | */ |
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57 | var $aClientScriptGenerators; |
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58 | |
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59 | /* |
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60 | Function: xajaxPluginManager |
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61 | |
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62 | Construct and initialize the one and only xajax plugin manager. |
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63 | */ |
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64 | function xajaxPluginManager() |
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65 | { |
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66 | $this->aRequestPlugins = array(); |
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67 | $this->aResponsePlugins = array(); |
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68 | |
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69 | $this->aConfigurable = array(); |
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70 | $this->aRegistrars = array(); |
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71 | $this->aProcessors = array(); |
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72 | $this->aClientScriptGenerators = array(); |
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73 | } |
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74 | |
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75 | /* |
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76 | Function: getInstance |
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77 | |
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78 | Implementation of the singleton pattern: returns the one and only instance of the |
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79 | xajax plugin manager. |
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80 | |
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81 | Returns: |
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82 | |
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83 | object - a reference to the one and only instance of the |
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84 | plugin manager. |
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85 | */ |
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86 | function &getInstance() |
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87 | { |
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88 | static $obj; |
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89 | if (!$obj) { |
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90 | $obj = new xajaxPluginManager(); |
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91 | } |
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92 | return $obj; |
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93 | } |
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94 | |
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95 | /* |
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96 | Function: loadPlugins |
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97 | |
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98 | Loads plugins from the folders specified. |
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99 | */ |
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100 | function loadPlugins($aFolders) |
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101 | { |
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102 | foreach ($aFolders as $sFolder) { |
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103 | if ($handle = opendir($sFolder)) { |
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104 | while (!(false === ($sName = readdir($handle)))) { |
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105 | $nLength = strlen($sName); |
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106 | if (8 < $nLength) { |
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107 | $sFileName = substr($sName, 0, $nLength - 8); |
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108 | $sExtension = substr($sName, $nLength - 8, 8); |
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109 | if ('.inc.php' == $sExtension) { |
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110 | require $sFolder . '/' . $sFileName . $sExtension; |
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111 | } |
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112 | } |
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113 | } |
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114 | |
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115 | closedir($handle); |
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116 | } |
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117 | } |
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118 | } |
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119 | |
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120 | /* |
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121 | Function: _insertIntoArray |
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122 | |
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123 | Inserts an entry into an array given the specified priority number. |
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124 | If a plugin already exists with the given priority, the priority is |
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125 | automatically incremented until a free spot is found. The plugin |
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126 | is then inserted into the empty spot in the array. |
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127 | |
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128 | nPriorityNumber - (number): The desired priority, used to order |
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129 | the plugins. |
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130 | */ |
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131 | function _insertIntoArray(&$aPlugins, &$objPlugin, $nPriority) |
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132 | { |
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133 | while (isset($aPlugins[$nPriority])) |
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134 | $nPriority++; |
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135 | |
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136 | $aPlugins[$nPriority] =& $objPlugin; |
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137 | } |
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138 | |
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139 | /* |
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140 | Function: registerPlugin |
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141 | |
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142 | Registers a plugin. |
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143 | |
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144 | objPlugin - (object): A reference to an instance of a plugin. |
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145 | |
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146 | Below is a table for priorities and their description: |
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147 | 0 thru 999: Plugins that are part of or extensions to the xajax core |
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148 | 1000 thru 8999: User created plugins, typically, these plugins don't care about order |
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149 | 9000 thru 9999: Plugins that generally need to be last or near the end of the plugin list |
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150 | */ |
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151 | function registerPlugin(&$objPlugin, $nPriority=1000) |
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152 | { |
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153 | if (is_a($objPlugin, 'xajaxRequestPlugin')) |
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154 | { |
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155 | $this->_insertIntoArray($this->aRequestPlugins, $objPlugin, $nPriority); |
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156 | |
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157 | if (method_exists($objPlugin, 'register')) |
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158 | $this->_insertIntoArray($this->aRegistrars, $objPlugin, $nPriority); |
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159 | |
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160 | if (method_exists($objPlugin, 'canProcessRequest')) |
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161 | if (method_exists($objPlugin, 'processRequest')) |
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162 | $this->_insertIntoArray($this->aProcessors, $objPlugin, $nPriority); |
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163 | } |
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164 | else if (is_a($objPlugin, 'xajaxResponsePlugin')) |
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165 | { |
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166 | $this->aResponsePlugins[] =& $objPlugin; |
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167 | } |
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168 | else |
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169 | { |
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170 | //SkipDebug |
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171 | $objLanguageManager =& xajaxLanguageManager::getInstance(); |
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172 | trigger_error( |
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173 | $objLanguageManager->getText('XJXPM:IPLGERR:01') |
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174 | . get_class($objPlugin) |
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175 | . $objLanguageManager->getText('XJXPM:IPLGERR:02') |
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176 | , E_USER_ERROR |
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177 | ); |
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178 | //EndSkipDebug |
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179 | } |
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180 | |
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181 | if (method_exists($objPlugin, 'configure')) |
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182 | $this->_insertIntoArray($this->aConfigurable, $objPlugin, $nPriority); |
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183 | |
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184 | if (method_exists($objPlugin, 'generateClientScript')) |
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185 | $this->_insertIntoArray($this->aClientScriptGenerators, $objPlugin, $nPriority); |
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186 | } |
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187 | |
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188 | /* |
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189 | Function: canProcessRequest |
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190 | |
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191 | Calls each of the request plugins and determines if the |
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192 | current request can be processed by one of them. If no processor identifies |
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193 | the current request, then the request must be for the initial page load. |
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194 | |
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195 | See <xajax->canProcessRequest> for more information. |
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196 | */ |
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197 | function canProcessRequest() |
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198 | { |
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199 | $bHandled = false; |
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200 | |
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201 | $aKeys = array_keys($this->aProcessors); |
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202 | sort($aKeys); |
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203 | foreach ($aKeys as $sKey) { |
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204 | $mResult = $this->aProcessors[$sKey]->canProcessRequest(); |
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205 | if (true === $mResult) |
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206 | $bHandled = true; |
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207 | else if (is_string($mResult)) |
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208 | return $mResult; |
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209 | } |
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210 | |
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211 | return $bHandled; |
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212 | } |
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213 | |
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214 | /* |
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215 | Function: processRequest |
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216 | |
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217 | Calls each of the request plugins to request that they process the |
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218 | current request. If the plugin processes the request, it will |
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219 | return true. |
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220 | */ |
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221 | function processRequest() |
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222 | { |
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223 | $bHandled = false; |
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224 | |
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225 | $aKeys = array_keys($this->aProcessors); |
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226 | sort($aKeys); |
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227 | foreach ($aKeys as $sKey) { |
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228 | $mResult = $this->aProcessors[$sKey]->processRequest(); |
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229 | if (true === $mResult) |
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230 | $bHandled = true; |
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231 | else if (is_string($mResult)) |
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232 | return $mResult; |
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233 | } |
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234 | |
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235 | return $bHandled; |
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236 | } |
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237 | |
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238 | /* |
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239 | Function: configure |
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240 | |
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241 | Call each of the request plugins passing along the configuration |
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242 | setting specified. |
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243 | |
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244 | sName - (string): The name of the configuration setting to set. |
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245 | mValue - (mixed): The value to be set. |
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246 | */ |
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247 | function configure($sName, $mValue) |
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248 | { |
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249 | $aKeys = array_keys($this->aConfigurable); |
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250 | sort($aKeys); |
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251 | foreach ($aKeys as $sKey) |
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252 | $this->aConfigurable[$sKey]->configure($sName, $mValue); |
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253 | } |
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254 | |
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255 | /* |
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256 | Function: register |
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257 | |
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258 | Call each of the request plugins and give them the opportunity to |
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259 | handle the registration of the specified function, event or callable object. |
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260 | */ |
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261 | function register($aArgs) |
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262 | { |
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263 | $aKeys = array_keys($this->aRegistrars); |
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264 | sort($aKeys); |
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265 | foreach ($aKeys as $sKey) |
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266 | { |
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267 | $objPlugin =& $this->aRegistrars[$sKey]; |
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268 | $mResult =& $objPlugin->register($aArgs); |
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269 | if (is_a($mResult, 'xajaxRequest')) |
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270 | return $mResult; |
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271 | if (is_array($mResult)) |
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272 | return $mResult; |
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273 | if (is_bool($mResult)) |
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274 | if (true === $mResult) |
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275 | return true; |
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276 | } |
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277 | //SkipDebug |
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278 | $objLanguageManager =& xajaxLanguageManager::getInstance(); |
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279 | trigger_error( |
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280 | $objLanguageManager->getText('XJXPM:MRMERR:01') |
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281 | . print_r($aArgs, true) |
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282 | , E_USER_ERROR |
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283 | ); |
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284 | //EndSkipDebug |
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285 | } |
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286 | |
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287 | /* |
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288 | Function: generateClientScript |
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289 | |
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290 | Call each of the request and response plugins giving them the |
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291 | opportunity to output some javascript to the page being generated. This |
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292 | is called only when the page is being loaded initially. This is not |
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293 | called when processing a request. |
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294 | */ |
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295 | function generateClientScript() |
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296 | { |
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297 | $aKeys = array_keys($this->aClientScriptGenerators); |
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298 | sort($aKeys); |
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299 | foreach ($aKeys as $sKey) |
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300 | $this->aClientScriptGenerators[$sKey]->generateClientScript(); |
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301 | } |
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302 | |
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303 | /* |
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304 | Function: getPlugin |
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305 | |
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306 | Locate the specified response plugin by name and return |
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307 | a reference to it if one exists. |
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308 | */ |
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309 | function &getPlugin($sName) |
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310 | { |
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311 | $aKeys = array_keys($this->aResponsePlugins); |
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312 | sort($aKeys); |
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313 | foreach ($aKeys as $sKey) |
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314 | if (is_a($this->aResponsePlugins[$sKey], $sName)) |
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315 | return $this->aResponsePlugins[$sKey]; |
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316 | |
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317 | $bFailure = false; |
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318 | return $bFailure; |
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319 | } |
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320 | } |
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