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doctrine2/lib/Doctrine/Hydrate/Alias.php

137 lines
4.5 KiB
PHP

<?php
/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.com>.
*/
/**
* Doctrine_Hydrate_Alias
* This class handles the creation of aliases for components in DQL query
*
* @package Doctrine
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @category Object Relational Mapping
* @link www.phpdoctrine.com
* @since 1.0
* @version $Revision$
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
*/
class Doctrine_Hydrate_Alias
{
protected $shortAliases = array();
protected $shortAliasIndexes = array();
public function clear()
{
$this->shortAliases = array();
$this->shortAliasIndexes = array();
}
public function generateNewAlias($alias)
{
if (isset($this->shortAliases[$alias])) {
// generate a new alias
$name = substr($alias, 0, 1);
$i = ((int) substr($alias, 1));
if ($i == 0) {
$i = 1;
}
$newIndex = ($this->shortAliasIndexes[$name] + $i);
return $name . $newIndex;
}
return $alias;
}
public function hasAlias($tableName)
{
return (isset($this->shortAliases[$tableName]));
}
public function getComponentAlias($tableAlias)
{
if ( ! isset($this->shortAliases[$tableAlias])) {
throw new Doctrine_Hydrate_Exception('Unknown table alias ' . $tableAlias);
}
return $this->shortAliases[$tableAlias];
}
public function getShortAliasIndex($alias)
{
if ( ! isset($this->shortAliasIndexes[$alias])) {
return 0;
}
return $this->shortAliasIndexes[$alias];
}
public function generateShortAlias($componentAlias, $tableName)
{
$char = strtolower(substr($tableName, 0, 1));
$alias = $char;
if ( ! isset($this->shortAliasIndexes[$alias])) {
$this->shortAliasIndexes[$alias] = 1;
}
while (isset($this->shortAliases[$alias])) {
$alias = $char . ++$this->shortAliasIndexes[$alias];
}
$this->shortAliases[$alias] = $componentAlias;
return $alias;
}
public function getAliases()
{
return $this->shortAliases;
}
public function addAlias($tableAlias, $componentAlias)
{
$this->shortAliases[$tableAlias] = $componentAlias;
}
/**
* getShortAlias
* some database such as Oracle need the identifier lengths to be < ~30 chars
* hence Doctrine creates as short identifier aliases as possible
*
* this method is used for the creation of short table aliases, its also
* smart enough to check if an alias already exists for given component (componentAlias)
*
* @param string $componentAlias the alias for the query component to search table alias for
* @param string $tableName the table name from which the table alias is being created
* @return string the generated / fetched short alias
*/
public function getShortAlias($componentAlias, $tableName = null)
{
$alias = array_search($componentAlias, $this->shortAliases);
if ($alias !== false) {
return $alias;
}
if ($tableName === null) {
throw new Doctrine_Hydrate_Exception("Couldn't get short alias for " . $componentAlias);
}
return $this->generateShortAlias($componentAlias, $tableName);
}
}