| 1 | <?php |
| 2 | /* |
| 3 | * $Id: Hydrate.php 3192 2007-11-19 17:55:23Z romanb $ |
| 4 | * |
| 5 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 6 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 7 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 8 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 9 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 10 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 11 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 12 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 13 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 14 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 15 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 16 | * |
| 17 | * This software consists of voluntary contributions made by many individuals |
| 18 | * and is licensed under the LGPL. For more information, see |
| 19 | * <http://www.phpdoctrine.com>. |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * Doctrine_Hydrate is a base class for Doctrine_RawSql and Doctrine_Query. |
| 24 | * Its purpose is to populate object graphs. |
| 25 | * |
| 26 | * |
| 27 | * @package Doctrine |
| 28 | * @subpackage Hydrate |
| 29 | * @license http://www.opensource.org/licenses/lgpl-license.php LGPL |
| 30 | * @link www.phpdoctrine.com |
| 31 | * @since 1.0 |
| 32 | * @version $Revision: 3192 $ |
| 33 | * @author Konsta Vesterinen <kvesteri@cc.hut.fi> |
| 34 | */ |
| 35 | class Doctrine_Hydrator extends Doctrine_Hydrator_Abstract |
| 36 | { |
| 37 | /** |
| 38 | * hydrateResultSet |
| 39 | * parses the data returned by statement object |
| 40 | * |
| 41 | * This is method defines the core of Doctrine's object population algorithm |
| 42 | * hence this method strives to be as fast as possible |
| 43 | * |
| 44 | * The key idea is the loop over the rowset only once doing all the needed operations |
| 45 | * within this massive loop. |
| 46 | * |
| 47 | * @todo: Detailed documentation. Refactor (too long & nesting level). |
| 48 | * |
| 49 | * @param mixed $stmt |
| 50 | * @param array $tableAliases Array that maps table aliases (SQL alias => DQL alias) |
| 51 | * @param array $aliasMap Array that maps DQL aliases to their components |
| 52 | * (DQL alias => array( |
| 53 | * 'table' => Table object, |
| 54 | * 'parent' => Parent DQL alias (if any), |
| 55 | * 'relation' => Relation object (if any), |
| 56 | * 'map' => Custom index to use as the key in the result (if any) |
| 57 | * ) |
| 58 | * ) |
| 59 | * @return array |
| 60 | */ |
| 61 | public function hydrateResultSet($stmt, $tableAliases, $hydrationMode = null) |
| 62 | { |
| 63 | //$s = microtime(true); |
| 64 | |
| 65 | $this->_tableAliases = $tableAliases; |
| 66 | |
| 67 | if ($hydrationMode == Doctrine::HYDRATE_NONE) { |
| 68 | return $stmt->fetchAll(PDO::FETCH_NUM); |
| 69 | } |
| 70 | |
| 71 | if ($hydrationMode === null) { |
| 72 | $hydrationMode = $this->_hydrationMode; |
| 73 | } |
| 74 | |
| 75 | if ($hydrationMode === Doctrine::HYDRATE_ARRAY) { |
| 76 | $driver = new Doctrine_Hydrator_ArrayDriver(); |
| 77 | } else { |
| 78 | $driver = new Doctrine_Hydrator_RecordDriver(); |
| 79 | } |
| 80 | |
| 81 | $event = new Doctrine_Event(null, Doctrine_Event::HYDRATE, null); |
| 82 | |
| 83 | |
| 84 | // Used variables during hydration |
| 85 | reset($this->_queryComponents); |
| 86 | $rootAlias = key($this->_queryComponents); |
| 87 | $rootComponentName = $this->_queryComponents[$rootAlias]['table']->getComponentName(); |
| 88 | // if only one component is involved we can make our lives easier |
| 89 | $isSimpleQuery = count($this->_queryComponents) <= 1; |
| 90 | // Holds the resulting hydrated data structure |
| 91 | $result = array(); |
| 92 | // Holds hydration listeners that get called during hydration |
| 93 | $listeners = array(); |
| 94 | // Lookup map to quickly discover/lookup existing records in the result |
| 95 | $identifierMap = array(); |
| 96 | // Holds for each component the last previously seen element in the result set |
| 97 | $prev = array(); |
| 98 | // holds the values of the identifier/primary key fields of components, |
| 99 | // separated by a pipe '|' and grouped by component alias (r, u, i, ... whatever) |
| 100 | $id = array(); |
| 101 | |
| 102 | $result = $driver->getElementCollection($rootComponentName); |
| 103 | |
| 104 | if ($stmt === false || $stmt === 0) { |
| 105 | return $result; |
| 106 | } |
| 107 | |
| 108 | // Initialize |
| 109 | foreach ($this->_queryComponents as $dqlAlias => $data) { |
| 110 | $componentName = $data['table']->getComponentName(); |
| 111 | $listeners[$componentName] = $data['table']->getRecordListener(); |
| 112 | $identifierMap[$dqlAlias] = array(); |
| 113 | $prev[$dqlAlias] = array(); |
| 114 | $id[$dqlAlias] = ''; |
| 115 | } |
| 116 | |
| 117 | // Process result set |
| 118 | $cache = array(); |
| 119 | while ($data = $stmt->fetch(Doctrine::FETCH_ASSOC)) { |
| 120 | $nonemptyComponents = array(); |
| 121 | $rowData = $this->_gatherRowData($data, $cache, $id, $nonemptyComponents); |
| 122 | |
| 123 | // |
| 124 | // hydrate the data of the root component from the current row |
| 125 | // |
| 126 | $table = $this->_queryComponents[$rootAlias]['table']; |
| 127 | $componentName = $table->getComponentName(); |
| 128 | $event->set('data', $rowData[$rootAlias]); |
| 129 | $listeners[$componentName]->preHydrate($event); |
| 130 | $element = $driver->getElement($rowData[$rootAlias], $componentName); |
| 131 | $index = false; |
| 132 | |
| 133 | // Check for an existing element |
| 134 | if ($isSimpleQuery || ! isset($identifierMap[$rootAlias][$id[$rootAlias]])) { |
| 135 | $event->set('data', $element); |
| 136 | $listeners[$componentName]->postHydrate($event); |
| 137 | |
| 138 | // do we need to index by a custom field? |
| 139 | if ($field = $this->_getCustomIndexField($rootAlias)) { |
| 140 | if (isset($result[$field])) { |
| 141 | throw new Doctrine_Hydrator_Exception("Couldn't hydrate. Found non-unique key mapping."); |
| 142 | } else if ( ! isset($element[$field])) { |
| 143 | throw new Doctrine_Hydrator_Exception("Couldn't hydrate. Found a non-existent key."); |
| 144 | } |
| 145 | $result[$element[$field]] = $element; |
| 146 | } else { |
| 147 | $result[] = $element; |
| 148 | } |
| 149 | |
| 150 | $identifierMap[$rootAlias][$id[$rootAlias]] = $driver->getLastKey($result); |
| 151 | } else { |
| 152 | $index = $identifierMap[$rootAlias][$id[$rootAlias]]; |
| 153 | } |
| 154 | |
| 155 | $this->_setLastElement($prev, $result, $index, $rootAlias, false); |
| 156 | unset($rowData[$rootAlias]); |
| 157 | |
| 158 | // end hydrate data of the root component for the current row |
| 159 | |
| 160 | |
| 161 | // $prev[$rootAlias] now points to the last element in $result. |
| 162 | // now hydrate the rest of the data found in the current row, that belongs to other |
| 163 | // (related) components. |
| 164 | $oneToOne = false; |
| 165 | foreach ($rowData as $dqlAlias => $data) { |
| 166 | $index = false; |
| 167 | $map = $this->_queryComponents[$dqlAlias]; |
| 168 | $table = $map['table']; |
| 169 | $componentName = $table->getComponentName(); |
| 170 | $event->set('data', $data); |
| 171 | $listeners[$componentName]->preHydrate($event); |
| 172 | |
| 173 | $element = $driver->getElement($data, $componentName); |
| 174 | |
| 175 | $parent = $map['parent']; |
| 176 | $relation = $map['relation']; |
| 177 | $relationAlias = $map['relation']->getAlias(); |
| 178 | |
| 179 | $path = $parent . '.' . $dqlAlias; |
| 180 | |
| 181 | if ( ! isset($prev[$parent])) { |
| 182 | break; |
| 183 | } |
| 184 | |
| 185 | // check the type of the relation |
| 186 | if ( ! $relation->isOneToOne() && $driver->initRelated($prev[$parent], $relationAlias)) { |
| 187 | // append element |
| 188 | if (isset($nonemptyComponents[$dqlAlias])) { |
| 189 | if ($isSimpleQuery || ! isset($identifierMap[$path][$id[$parent]][$id[$dqlAlias]])) { |
| 190 | $event->set('data', $element); |
| 191 | $listeners[$componentName]->postHydrate($event); |
| 192 | |
| 193 | if ($field = $this->_getCustomIndexField($dqlAlias)) { |
| 194 | if (isset($prev[$parent][$relationAlias][$field])) { |
| 195 | throw new Doctrine_Hydrator_Exception("Couldn't hydrate. Found non-unique key mapping."); |
| 196 | } else if ( ! isset($element[$field])) { |
| 197 | throw new Doctrine_Hydrator_Exception("Couldn't hydrate. Found a non-existent key."); |
| 198 | } |
| 199 | $prev[$parent][$relationAlias][$element[$field]] = $element; |
| 200 | } else { |
| 201 | $prev[$parent][$relationAlias][] = $element; |
| 202 | } |
| 203 | |
| 204 | $identifierMap[$path][$id[$parent]][$id[$dqlAlias]] = $driver->getLastKey($prev[$parent][$relationAlias]); |
| 205 | } else { |
| 206 | $index = $identifierMap[$path][$id[$parent]][$id[$dqlAlias]]; |
| 207 | } |
| 208 | } |
| 209 | // register collection for later snapshots |
| 210 | $driver->registerCollection($prev[$parent][$relationAlias]); |
| 211 | } else { |
| 212 | // 1-1 relation |
| 213 | $oneToOne = true; |
| 214 | if ( ! isset($nonemptyComponents[$dqlAlias])) { |
| 215 | $prev[$parent][$relationAlias] = $driver->getNullPointer(); |
| 216 | } else { |
| 217 | $prev[$parent][$relationAlias] = $element; |
| 218 | } |
| 219 | } |
| 220 | $coll =& $prev[$parent][$relationAlias]; |
| 221 | $this->_setLastElement($prev, $coll, $index, $dqlAlias, $oneToOne); |
| 222 | $id[$dqlAlias] = ''; |
| 223 | } |
| 224 | $id[$rootAlias] = ''; |
| 225 | } |
| 226 | |
| 227 | $stmt->closeCursor(); |
| 228 | |
| 229 | $driver->flush(); |
| 230 | |
| 231 | //$e = microtime(true); |
| 232 | //echo 'Hydration took: ' . ($e - $s) . ' for '.count($result).' records<br />'; |
| 233 | |
| 234 | return $result; |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * _setLastElement |
| 239 | * |
| 240 | * sets the last element of given data array / collection |
| 241 | * as previous element |
| 242 | * |
| 243 | * @param boolean|integer $index |
| 244 | * @return void |
| 245 | * @todo Detailed documentation |
| 246 | */ |
| 247 | protected function _setLastElement(&$prev, &$coll, $index, $dqlAlias, $oneToOne) |
| 248 | { |
| 249 | if ($coll === self::$_null) { |
| 250 | return false; |
| 251 | } |
| 252 | |
| 253 | if ($index !== false) { |
| 254 | // Link element at $index to previous element for the component |
| 255 | // identified by the DQL alias $alias |
| 256 | $prev[$dqlAlias] =& $coll[$index]; |
| 257 | return; |
| 258 | } |
| 259 | |
| 260 | if (is_array($coll) && $coll) { |
| 261 | if ($oneToOne) { |
| 262 | $prev[$dqlAlias] =& $coll; |
| 263 | } else { |
| 264 | end($coll); |
| 265 | $prev[$dqlAlias] =& $coll[key($coll)]; |
| 266 | } |
| 267 | } else if (count($coll) > 0) { |
| 268 | $prev[$dqlAlias] = $coll->getLast(); |
| 269 | } else if (isset($prev[$dqlAlias])) { |
| 270 | unset($prev[$dqlAlias]); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * Puts the fields of a data row into a new array, grouped by the component |
| 276 | * they belong to. The column names in the result set are mapped to their |
| 277 | * field names during this procedure. |
| 278 | * |
| 279 | * @return array An array with all the fields (name => value) of the data row, |
| 280 | * grouped by their component (alias). |
| 281 | */ |
| 282 | protected function _gatherRowData(&$data, &$cache, &$id, &$nonemptyComponents) |
| 283 | { |
| 284 | $rowData = array(); |
| 285 | |
| 286 | foreach ($data as $key => $value) { |
| 287 | // Parse each column name only once. Cache the results. |
| 288 | if ( ! isset($cache[$key])) { |
| 289 | $e = explode('__', $key); |
| 290 | $last = strtolower(array_pop($e)); |
| 291 | $cache[$key]['dqlAlias'] = $this->_tableAliases[strtolower(implode('__', $e))]; |
| 292 | $fieldName = $this->_queryComponents[$cache[$key]['dqlAlias']]['table']->getFieldName($last); |
| 293 | $cache[$key]['fieldName'] = $fieldName; |
| 294 | } |
| 295 | |
| 296 | $map = $this->_queryComponents[$cache[$key]['dqlAlias']]; |
| 297 | $table = $map['table']; |
| 298 | $dqlAlias = $cache[$key]['dqlAlias']; |
| 299 | $fieldName = $cache[$key]['fieldName']; |
| 300 | |
| 301 | if (isset($this->_queryComponents[$dqlAlias]['agg'][$fieldName])) { |
| 302 | $fieldName = $this->_queryComponents[$dqlAlias]['agg'][$fieldName]; |
| 303 | } |
| 304 | |
| 305 | if ($table->isIdentifier($fieldName)) { |
| 306 | $id[$dqlAlias] .= '|' . $value; |
| 307 | } |
| 308 | |
| 309 | $rowData[$dqlAlias][$fieldName] = $table->prepareValue($fieldName, $value); |
| 310 | |
| 311 | if ( ! isset($nonemptyComponents[$dqlAlias]) && $value !== null) { |
| 312 | $nonemptyComponents[$dqlAlias] = true; |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | return $rowData; |
| 317 | } |
| 318 | |
| 319 | /** |
| 320 | * Gets the custom field used for indexing for the specified component alias. |
| 321 | * |
| 322 | * @return string The field name of the field used for indexing or NULL |
| 323 | * if the component does not use any custom field indices. |
| 324 | */ |
| 325 | protected function _getCustomIndexField($alias) |
| 326 | { |
| 327 | return isset($this->_queryComponents[$alias]['map']) ? $this->_queryComponents[$alias]['map'] : null; |
| 328 | } |
| 329 | |
| 330 | } |