lib/xmldb/xmldb_key.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
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   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * This class represent one XMLDB Key
  19  *
  20  * @package    core_xmldb
  21  * @copyright  1999 onwards Martin Dougiamas     http://dougiamas.com
  22  *             2001-3001 Eloy Lafuente (stronk7) http://contiento.com
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26 defined('MOODLE_INTERNAL') || die();
  27
  28
  29 class xmldb_key extends xmldb_object {
  30
  31     /** @var int type of key */
  32     protected $type;
  33
  34     /** @var array of fields */
  35     protected $fields;
  36
  37     /** @var string referenced table */
  38     protected $reftable;
  39
  40     /** @var array referenced fields */
  41     protected $reffields;
  42
  43     /**
  44      * Creates one new xmldb_key
  45      * @param string $name
  46      * @param string $type XMLDB_KEY_[PRIMARY|UNIQUE|FOREIGN|FOREIGN_UNIQUE]
  47      * @param array $fields an array of fieldnames to build the key over
  48      * @param string $reftable name of the table the FK points to or null
  49      * @param array $reffields an array of fieldnames in the FK table or null
  50      */
  51     public function __construct($name, $type=null, $fields=array(), $reftable=null, $reffields=null) {
  52         $this->type = null;
  53         $this->fields = array();
  54         $this->reftable = null;
  55         $this->reffields = array();
  56         parent::__construct($name);
  57         $this->set_attributes($type, $fields, $reftable, $reffields);
  58     }
  59
  60     /**
  61      * Set all the attributes of one xmldb_key
  62      *
  63      * @param string $type XMLDB_KEY_[PRIMARY|UNIQUE|FOREIGN|FOREIGN_UNIQUE]
  64      * @param array $fields an array of fieldnames to build the key over
  65      * @param string $reftable name of the table the FK points to or null
  66      * @param array $reffields an array of fieldnames in the FK table or null
  67      */
  68     public function set_attributes($type, $fields, $reftable=null, $reffields=null) {
  69         $this->type = $type;
  70         $this->fields = $fields;
  71         $this->reftable = $reftable;
  72         $this->reffields = empty($reffields) ? array() : $reffields;
  73     }
  74
  75     /**
  76      * Get the key type
  77      * @return int
  78      */
  79     public function getType() {
  80         return $this->type;
  81     }
  82
  83     /**
  84      * Set the key type
  85      * @param int $type
  86      */
  87     public function setType($type) {
  88         $this->type = $type;
  89     }
  90
  91     /**
  92      * Set the key fields
  93      * @param array $fields
  94      */
  95     public function setFields($fields) {
  96         $this->fields = $fields;
  97     }
  98
  99     /**
 100      * Set the key reftable
 101      * @param string $reftable
 102      */
 103     public function setRefTable($reftable) {
 104         $this->reftable = $reftable;
 105     }
 106
 107     /**
 108      * Set the key reffields
 109      * @param array $reffields
 110      */
 111     public function setRefFields($reffields) {
 112         $this->reffields = $reffields;
 113     }
 114
 115     /**
 116      * Get the key fields
 117      * @return array
 118      */
 119     public function getFields() {
 120         return $this->fields;
 121     }
 122
 123     /**
 124      * Get the key reftable
 125      * @return string
 126      */
 127     public function getRefTable() {
 128         return $this->reftable;
 129     }
 130
 131     /**
 132      * Get the key reffields
 133      * @return array reference to ref fields
 134      */
 135     public function getRefFields() {
 136         return $this->reffields;
 137     }
 138
 139     /**
 140      * Load data from XML to the key
 141      * @param array $xmlarr
 142      * @return bool success
 143      */
 144     public function arr2xmldb_key($xmlarr) {
 145
 146         $result = true;
 147
 148         // Debug the table
 149         // traverse_xmlize($xmlarr);                   //Debug
 150         // print_object ($GLOBALS['traverse_array']);  //Debug
 151         // $GLOBALS['traverse_array']="";              //Debug
 152
 153         // Process key attributes (name, type, fields, reftable,
 154         // reffields, comment, previous, next)
 155         if (isset($xmlarr['@']['NAME'])) {
 156             $this->name = trim($xmlarr['@']['NAME']);
 157         } else {
 158             $this->errormsg = 'Missing NAME attribute';
 159             $this->debug($this->errormsg);
 160             $result = false;
 161         }
 162
 163         if (isset($xmlarr['@']['TYPE'])) {
 164             // Check for valid type
 165             $type = $this->getXMLDBKeyType(trim($xmlarr['@']['TYPE']));
 166             if ($type) {
 167                 $this->type = $type;
 168             } else {
 169                 $this->errormsg = 'Invalid TYPE attribute';
 170                 $this->debug($this->errormsg);
 171                 $result = false;
 172             }
 173         } else {
 174             $this->errormsg = 'Missing TYPE attribute';
 175             $this->debug($this->errormsg);
 176             $result = false;
 177         }
 178
 179         if (isset($xmlarr['@']['FIELDS'])) {
 180             $fields = strtolower(trim($xmlarr['@']['FIELDS']));
 181             if ($fields) {
 182                 $fieldsarr = explode(',',$fields);
 183                 if ($fieldsarr) {
 184                     foreach ($fieldsarr as $key => $element) {
 185                         $fieldsarr [$key] = trim($element);
 186                     }
 187                 } else {
 188                     $this->errormsg = 'Incorrect FIELDS attribute (comma separated of fields)';
 189                     $this->debug($this->errormsg);
 190                     $result = false;
 191                 }
 192             } else {
 193                 $this->errormsg = 'Empty FIELDS attribute';
 194                 $this->debug($this->errormsg);
 195                 $result = false;
 196             }
 197         } else {
 198             $this->errormsg = 'Missing FIELDS attribute';
 199             $this->debug($this->errormsg);
 200             $result = false;
 201         }
 202         // Finally, set the array of fields
 203         $this->fields = $fieldsarr;
 204
 205         if (isset($xmlarr['@']['REFTABLE'])) {
 206             // Check we are in a FK
 207             if ($this->type == XMLDB_KEY_FOREIGN ||
 208                 $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 209                 $reftable = strtolower(trim($xmlarr['@']['REFTABLE']));
 210                 if (!$reftable) {
 211                     $this->errormsg = 'Empty REFTABLE attribute';
 212                     $this->debug($this->errormsg);
 213                     $result = false;
 214                 }
 215             } else {
 216                 $this->errormsg = 'Wrong REFTABLE attribute (only FK can have it)';
 217                 $this->debug($this->errormsg);
 218                 $result = false;
 219             }
 220         } else if ($this->type == XMLDB_KEY_FOREIGN ||
 221                    $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 222             $this->errormsg = 'Missing REFTABLE attribute';
 223             $this->debug($this->errormsg);
 224             $result = false;
 225         }
 226         // Finally, set the reftable
 227         if ($this->type == XMLDB_KEY_FOREIGN ||
 228             $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 229             $this->reftable = $reftable;
 230         }
 231
 232         if (isset($xmlarr['@']['REFFIELDS'])) {
 233             // Check we are in a FK
 234             if ($this->type == XMLDB_KEY_FOREIGN ||
 235                 $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 236                 $reffields = strtolower(trim($xmlarr['@']['REFFIELDS']));
 237                 if ($reffields) {
 238                     $reffieldsarr = explode(',',$reffields);
 239                     if ($reffieldsarr) {
 240                         foreach ($reffieldsarr as $key => $element) {
 241                             $reffieldsarr [$key] = trim($element);
 242                         }
 243                     } else {
 244                         $this->errormsg = 'Incorrect REFFIELDS attribute (comma separated of fields)';
 245                         $this->debug($this->errormsg);
 246                         $result = false;
 247                     }
 248                 } else {
 249                     $this->errormsg = 'Empty REFFIELDS attribute';
 250                     $this->debug($this->errormsg);
 251                     $result = false;
 252                 }
 253             } else {
 254                 $this->errormsg = 'Wrong REFFIELDS attribute (only FK can have it)';
 255                 $this->debug($this->errormsg);
 256                 $result = false;
 257             }
 258         } else if ($this->type == XMLDB_KEY_FOREIGN ||
 259                    $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 260             $this->errormsg = 'Missing REFFIELDS attribute';
 261             $this->debug($this->errormsg);
 262             $result = false;
 263         }
 264         // Finally, set the array of reffields
 265         if ($this->type == XMLDB_KEY_FOREIGN ||
 266             $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 267             $this->reffields = $reffieldsarr;
 268         }
 269
 270         if (isset($xmlarr['@']['COMMENT'])) {
 271             $this->comment = trim($xmlarr['@']['COMMENT']);
 272         }
 273
 274         // Set some attributes
 275         if ($result) {
 276             $this->loaded = true;
 277         }
 278         $this->calculateHash();
 279         return $result;
 280     }
 281
 282     /**
 283      * This function returns the correct XMLDB_KEY_XXX value for the
 284      * string passed as argument
 285      * @param string $type
 286      * @return int
 287      */
 288     public function getXMLDBKeyType($type) {
 289
 290         $result = XMLDB_KEY_INCORRECT;
 291
 292         switch (strtolower($type)) {
 293             case 'primary':
 294                 $result = XMLDB_KEY_PRIMARY;
 295                 break;
 296             case 'unique':
 297                 $result = XMLDB_KEY_UNIQUE;
 298                 break;
 299             case 'foreign':
 300                 $result = XMLDB_KEY_FOREIGN;
 301                 break;
 302             case 'foreign-unique':
 303                 $result = XMLDB_KEY_FOREIGN_UNIQUE;
 304                 break;
 305             // case 'check':  //Not supported
 306             //     $result = XMLDB_KEY_CHECK;
 307             //     break;
 308         }
 309         // Return the normalized XMLDB_KEY
 310         return $result;
 311     }
 312
 313     /**
 314      * This function returns the correct name value for the
 315      * XMLDB_KEY_XXX passed as argument
 316      * @param int $type
 317      * @return string
 318      */
 319     public function getXMLDBKeyName($type) {
 320
 321         $result = '';
 322
 323         switch ($type) {
 324             case XMLDB_KEY_PRIMARY:
 325                 $result = 'primary';
 326                 break;
 327             case XMLDB_KEY_UNIQUE:
 328                 $result = 'unique';
 329                 break;
 330             case XMLDB_KEY_FOREIGN:
 331                 $result = 'foreign';
 332                 break;
 333             case XMLDB_KEY_FOREIGN_UNIQUE:
 334                 $result = 'foreign-unique';
 335                 break;
 336             // case XMLDB_KEY_CHECK:  //Not supported
 337             //     $result = 'check';
 338             //     break;
 339         }
 340         // Return the normalized name
 341         return $result;
 342     }
 343
 344     /**
 345      * This function calculate and set the hash of one xmldb_key
 346      * @param bool $recursive
 347      */
 348      public function calculateHash($recursive = false) {
 349         if (!$this->loaded) {
 350             $this->hash = null;
 351         } else {
 352             $key = $this->type . implode(', ', $this->fields);
 353             if ($this->type == XMLDB_KEY_FOREIGN ||
 354                 $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 355                 $key .= $this->reftable . implode(', ', $this->reffields);
 356             }
 357                     ;
 358             $this->hash = md5($key);
 359         }
 360     }
 361
 362     /**
 363      *This function will output the XML text for one key
 364      * @return string
 365      */
 366     public function xmlOutput() {
 367         $o = '';
 368         $o.= '        <KEY NAME="' . $this->name . '"';
 369         $o.= ' TYPE="' . $this->getXMLDBKeyName($this->type) . '"';
 370         $o.= ' FIELDS="' . implode(', ', $this->fields) . '"';
 371         if ($this->type == XMLDB_KEY_FOREIGN ||
 372             $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 373             $o.= ' REFTABLE="' . $this->reftable . '"';
 374             $o.= ' REFFIELDS="' . implode(', ', $this->reffields) . '"';
 375         }
 376         if ($this->comment) {
 377             $o.= ' COMMENT="' . htmlspecialchars($this->comment) . '"';
 378         }
 379         $o.= '/>' . "\n";
 380
 381         return $o;
 382     }
 383
 384     /**
 385      * This function will set all the attributes of the xmldb_key object
 386      * based on information passed in one ADOkey
 387      * @oaram array $adokey
 388      */
 389     public function setFromADOKey($adokey) {
 390
 391         // Calculate the XMLDB_KEY
 392         switch (strtolower($adokey['name'])) {
 393             case 'primary':
 394                 $this->type = XMLDB_KEY_PRIMARY;
 395                 break;
 396             default:
 397                 $this->type = XMLDB_KEY_UNIQUE;
 398         }
 399         // Set the fields, converting all them to lowercase
 400         $fields = array_flip(array_change_key_case(array_flip($adokey['columns'])));
 401         $this->fields = $fields;
 402         // Some more fields
 403         $this->loaded = true;
 404         $this->changed = true;
 405     }
 406
 407     /**
 408      * Returns the PHP code needed to define one xmldb_key
 409      * @return string
 410      */
 411     public function getPHP() {
 412
 413         $result = '';
 414
 415         // The type
 416         switch ($this->getType()) {
 417             case XMLDB_KEY_PRIMARY:
 418                 $result .= 'XMLDB_KEY_PRIMARY' . ', ';
 419                 break;
 420             case XMLDB_KEY_UNIQUE:
 421                 $result .= 'XMLDB_KEY_UNIQUE' . ', ';
 422                 break;
 423             case XMLDB_KEY_FOREIGN:
 424                 $result .= 'XMLDB_KEY_FOREIGN' . ', ';
 425                 break;
 426             case XMLDB_KEY_FOREIGN_UNIQUE:
 427                 $result .= 'XMLDB_KEY_FOREIGN_UNIQUE' . ', ';
 428                 break;
 429         }
 430         // The fields
 431         $keyfields = $this->getFields();
 432         if (!empty($keyfields)) {
 433             $result .= 'array(' . "'".  implode("', '", $keyfields) . "')";
 434         } else {
 435             $result .= 'null';
 436         }
 437         // The FKs attributes
 438         if ($this->getType() == XMLDB_KEY_FOREIGN ||
 439             $this->getType() == XMLDB_KEY_FOREIGN_UNIQUE) {
 440             // The reftable
 441             $reftable = $this->getRefTable();
 442             if (!empty($reftable)) {
 443                 $result .= ", '" . $reftable . "', ";
 444             } else {
 445                 $result .= 'null, ';
 446             }
 447             // The reffields
 448             $reffields = $this->getRefFields();
 449             if (!empty($reffields)) {
 450                 $result .= 'array(' . "'".  implode("', '", $reffields) . "')";
 451             } else {
 452                 $result .= 'null';
 453             }
 454         }
 455         // Return result
 456         return $result;
 457     }
 458
 459     /**
 460      * Shows info in a readable format
 461      * @return string
 462      */
 463     public function readableInfo() {
 464         $o = '';
 465         // type
 466         $o .= $this->getXMLDBKeyName($this->type);
 467         // fields
 468         $o .= ' (' . implode(', ', $this->fields) . ')';
 469         // foreign key
 470         if ($this->type == XMLDB_KEY_FOREIGN ||
 471             $this->type == XMLDB_KEY_FOREIGN_UNIQUE) {
 472             $o .= ' references ' . $this->reftable . ' (' . implode(', ', $this->reffields) . ')';
 473         }
 474
 475         return $o;
 476     }
 477 }