350 lines
13 KiB
PHP
350 lines
13 KiB
PHP
<?php
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/*
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* $Id: Table.php 1397 2007-05-19 19:54:15Z zYne $
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information, see
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* <http://www.phpdoctrine.com>.
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*/
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/**
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* Doctrine_Relation_Parser
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*
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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* @package Doctrine
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @version $Revision: 1397 $
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* @category Object Relational Mapping
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* @link www.phpdoctrine.com
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* @since 1.0
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*/
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class Doctrine_Relation_Parser
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{
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/**
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* @var Doctrine_Table $_table the table object this parser belongs to
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*/
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protected $_table;
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/**
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* @var array $_relations an array containing all the Doctrine_Relation objects for this table
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*/
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protected $_relations = array();
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/**
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* @var array $_pending relations waiting for parsing
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*/
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protected $_pending = array();
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/**
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* constructor
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*
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* @param Doctrine_Table $table the table object this parser belongs to
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*/
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public function __construct(Doctrine_Table $table)
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{
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$this->_table = $table;
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}
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/**
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* getTable
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*
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* @return Doctrine_Table the table object this parser belongs to
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*/
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public function getTable()
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{
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return $this->_table;
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}
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/**
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* getPendingRelation
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*
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* @return array an array defining a pending relation
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*/
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public function getPendingRelation($name)
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{
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if ( ! isset($this->_pending[$name])) {
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throw new Doctrine_Relation_Exception('Unknown pending relation ' . $name);
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}
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return $this->_pending[$name];
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}
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/**
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* binds a relation
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*
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* @param string $name
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* @param string $field
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* @return void
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*/
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public function bind($name, $options = array())
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{
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if (isset($this->relations[$name])) {
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unset($this->relations[$name]);
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}
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$lower = strtolower($name);
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if ($this->_table->hasColumn($lower)) {
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throw new Doctrine_Relation_Exception("Couldn't bind relation. Column with name " . $lower . ' already exists!');
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}
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$e = explode(' as ', $name);
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$name = $e[0];
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$alias = isset($e[1]) ? $e[1] : $name;
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if ( ! isset($options['type'])) {
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throw new Doctrine_Relation_Exception('Relation type not set.');
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}
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$this->_pending[$alias] = array_merge($options, array('class' => $name, 'alias' => $alias));
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}
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/**
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* getRelation
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*
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* @param string $alias relation alias
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*/
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public function getRelation($alias, $recursive = true)
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{
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if (isset($this->_relations[$alias])) {
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return $this->_relations[$alias];
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}
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if (isset($this->_pending[$alias])) {
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$def = $this->_pending[$alias];
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// check if reference class name exists
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// if it does we are dealing with association relation
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if (isset($def['refClass'])) {
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$def = $this->completeAssocDefinition($def);
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$localClasses = array_merge($this->_table->getOption('parents'), array($this->_table->getComponentName()));
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if ( ! isset($this->_pending[$def['refClass']]) &&
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! isset($this->_relations[$def['refClass']])) {
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$def['refTable']->getRelationParser()->bind($this->_table->getComponentName(),
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array('type' => Doctrine_Relation::ONE,
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'local' => $def['local'],
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'foreign' => $this->_table->getIdentifier(),
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'localKey' => true,
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));
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$this->bind($def['refClass'], array('type' => Doctrine_Relation::MANY,
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'foreign' => $def['local']));
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}
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if (in_array($def['class'], $localClasses)) {
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$rel = new Doctrine_Relation_Association_Self($def);
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} else {
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$rel = new Doctrine_Relation_Association($def);
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}
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} else {
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// simple foreign key relation
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$def = $this->completeDefinition($def);
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if (isset($def['localKey'])) {
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$rel = new Doctrine_Relation_LocalKey($def);
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} else {
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$rel = new Doctrine_Relation_ForeignKey($def);
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}
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}
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if (isset($rel)) {
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// unset pending relation
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unset($this->_pending[$alias]);
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$this->_relations[$alias] = $rel;
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return $rel;
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}
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}
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if ($recursive) {
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return $this->getRelation($alias, false);
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} else {
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throw new Doctrine_Table_Exception('Unknown relation alias ' . $alias);
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}
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}
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/**
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* getRelations
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* returns an array containing all relation objects
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*
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* @return array an array of Doctrine_Relation objects
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*/
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public function getRelations()
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{
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foreach ($this->_pending as $k => $v) {
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$this->getRelation($k);
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}
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return $this->_relations;
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}
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/**
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* Completes the given association definition
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*
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* @param array $def definition array to be completed
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* @return array completed definition array
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*/
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public function completeAssocDefinition($def)
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{
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$conn = $this->_table->getConnection();
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$def['table'] = $conn->getTable($def['class']);
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$def['refTable'] = $conn->getTable($def['refClass']);
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if ( ! isset($def['foreign'])) {
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// foreign key not set
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// try to guess the foreign key
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$columns = $this->getIdentifiers($def['table']);
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$def['foreign'] = $columns;
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}
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if ( ! isset($def['local'])) {
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// local key not set
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// try to guess the local key
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$columns = $this->getIdentifiers($this->_table);
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$def['local'] = $columns;
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}
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return $def;
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}
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/**
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* getIdentifiers
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* gives a list of identifiers from given table
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*
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* the identifiers are in format:
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* [componentName].[identifier]
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*
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* @param Doctrine_Table $table table object to retrieve identifiers from
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*/
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public function getIdentifiers(Doctrine_Table $table)
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{
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if (is_array($table->getIdentifier())) {
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$columns = array();
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foreach((array) $table->getIdentifier() as $identifier) {
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$columns[] = strtolower($table->getComponentName())
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. '_' . $table->getIdentifier();
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}
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} else {
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$columns = strtolower($table->getComponentName())
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. '_' . $table->getIdentifier();
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}
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return $columns;
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}
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/**
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* guessColumns
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*
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* @param array $classes an array of class names
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* @param Doctrine_Table $foreignTable foreign table object
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* @return array an array of column names
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*/
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public function guessColumns(array $classes, Doctrine_Table $foreignTable)
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{
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$conn = $this->_table->getConnection();
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foreach ($classes as $class) {
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$table = $conn->getTable($class);
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$columns = $this->getIdentifiers($table);
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$found = true;
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foreach ((array) $columns as $column) {
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if ( ! $foreignTable->hasColumn($column)) {
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$found = false;
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break;
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}
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}
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if ($found) {
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break;
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}
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}
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if ( ! $found) {
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throw new Doctrine_Relation_Exception("Couldn't find columns.");
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}
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return $columns;
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}
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/**
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* Completes the given definition
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*
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* @param array $def definition array to be completed
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* @return array completed definition array
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*/
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public function completeDefinition($def)
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{
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$conn = $this->_table->getConnection();
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$def['table'] = $conn->getTable($def['class']);
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$foreignClasses = array_merge($def['table']->getOption('parents'), array($def['class']));
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$localClasses = array_merge($this->_table->getOption('parents'), array($this->_table->getComponentName()));
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if (isset($def['local'])) {
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if ( ! isset($def['foreign'])) {
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// local key is set, but foreign key is not
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// try to guess the foreign key
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if ($def['local'] === $this->_table->getIdentifier()) {
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$def['foreign'] = $this->guessColumns($localClasses, $def['table']);
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} else {
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// the foreign field is likely to be the
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// identifier of the foreign class
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$def['foreign'] = $def['table']->getIdentifier();
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$def['localKey'] = true;
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}
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}
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} else {
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if (isset($def['foreign'])) {
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// local key not set, but foreign key is set
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// try to guess the local key
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if ($def['foreign'] === $def['table']->getIdentifier()) {
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$def['localKey'] = true;
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$def['local'] = $this->guessColumns($foreignClasses, $this->_table);
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} else {
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$def['local'] = $this->_table->getIdentifier();
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}
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} else {
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// neither local or foreign key is being set
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// try to guess both keys
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$conn = $this->_table->getConnection();
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// the following loops are needed for covering inheritance
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foreach ($localClasses as $class) {
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$table = $conn->getTable($class);
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$column = strtolower($table->getComponentName())
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. '_' . $table->getIdentifier();
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foreach ($foreignClasses as $class2) {
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$table2 = $conn->getTable($class2);
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if ($table2->hasColumn($column)) {
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$def['foreign'] = $column;
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$def['local'] = $table->getIdentifier();
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return $def;
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}
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}
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}
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foreach ($foreignClasses as $class) {
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$table = $conn->getTable($class);
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$column = strtolower($table->getComponentName())
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. '_' . $table->getIdentifier();
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foreach ($localClasses as $class2) {
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$table2 = $conn->getTable($class2);
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if ($table2->hasColumn($column)) {
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$def['foreign'] = $table->getIdentifier();
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$def['local'] = $column;
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$def['localKey'] = true;
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return $def;
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}
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}
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}
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throw new Doctrine_Relation_Parser_Exception("Couldn't complete relation definition.");
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}
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}
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return $def;
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}
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}
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