129 lines
4.3 KiB
PHP
129 lines
4.3 KiB
PHP
<?php
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/*
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* $Id$
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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_Hydrate_Alias
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* This class handles the creation of aliases for components in DQL query
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*
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* @package Doctrine
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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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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* @version $Revision$
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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*/
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class Doctrine_Hydrate_Alias
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{
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protected $shortAliases = array();
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protected $shortAliasIndexes = array();
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public function clear()
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{
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$this->shortAliases = array();
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$this->shortAliasIndexes = array();
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}
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public function generateNewAlias($alias)
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{
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if (isset($this->shortAliases[$alias])) {
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// generate a new alias
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$name = substr($alias, 0, 1);
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$i = ((int) substr($alias, 1));
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if ($i == 0) {
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$i = 1;
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}
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$newIndex = ($this->shortAliasIndexes[$name] + $i);
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return $name . $newIndex;
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}
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return $alias;
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}
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public function hasAliasFor($tableName)
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{
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return (isset($this->shortAliases[$tableName]));
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}
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public function getComponentAlias($tableAlias)
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{
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if ( ! isset($this->shortAliases[$tableAlias])) {
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throw new Doctrine_Hydrate_Exception('Unknown table alias ' . $tableAlias);
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}
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return $this->shortAliases[$tableAlias];
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}
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public function getShortAliasIndex($alias)
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{
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if ( ! isset($this->shortAliasIndexes[$alias])) {
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return 0;
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}
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return $this->shortAliasIndexes[$alias];
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}
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public function generateShortAlias($componentAlias, $tableName)
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{
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$char = strtolower(substr($tableName, 0, 1));
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$alias = $char;
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if ( ! isset($this->shortAliasIndexes[$alias])) {
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$this->shortAliasIndexes[$alias] = 1;
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}
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while (isset($this->shortAliases[$alias])) {
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$alias = $char . ++$this->shortAliasIndexes[$alias];
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}
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$this->shortAliases[$alias] = $componentAlias;
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return $alias;
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}
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/**
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* getShortAlias
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* some database such as Oracle need the identifier lengths to be < ~30 chars
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* hence Doctrine creates as short identifier aliases as possible
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*
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* this method is used for the creation of short table aliases, its also
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* smart enough to check if an alias already exists for given component (componentAlias)
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*
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* @param string $componentAlias the alias for the query component to search table alias for
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* @param string $tableName the table name from which the table alias is being created
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* @return string the generated / fetched short alias
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*/
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public function getShortAlias($componentAlias, $tableName = null)
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{
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$alias = array_search($componentAlias, $this->shortAliases);
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if ($alias !== false) {
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return $alias;
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}
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if ($tableName === null) {
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throw new Doctrine_Hydrate_Exception("Couldn't get short alias for " . $componentAlias);
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}
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return $this->generateShortAlias($componentAlias, $tableName);
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}
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}
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