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<?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.net>.
*/
/**
* Doctrine_Locator
*
* @package Doctrine
* @subpackage Doctrine_Locator
* @category Locator
* @license http://www.gnu.org/licenses/lgpl.txt LGPL
* @link http://www.phpdoctrine.net
* @author Janne Vanhala <jpvanhal@cc.hut.fi>
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
* @author Eevert Saukkokoski <dmnEe0@gmail.com>
* @version $Revision$
* @since 1.0
*/
class Doctrine_Locator implements Countable, IteratorAggregate
{
/**
* @var array $_resources an array of bound resources
*/
protected $_resources = array();
/**
* @var string $_classPrefix the default class prefix
*/
protected $_classPrefix = 'Doctrine_';
/**
* @var array $_instances a pool of this object's instances
*/
protected static $_instances = array();
/**
* Constructor. Provide an array of resources to set initial contents.
*
* @param array
* @return void
*/
public function __construct(array $defaults = null)
{
if (null !== $defaults) {
foreach ($defaults as $name => $resource) {
if ($resource instanceof Doctrine_Locator_Injectable) {
$resource->setLocator($this);
}
$this->_resources[$name] = $resource;
}
}
self::$_instances[] = $this;
}
/**
* instance
*
* @return Sensei_Locator
*/
public static function instance()
{
if (empty(self::$_instances)) {
$obj = new Doctrine_Locator();
}
return current(self::$_instances);
}
/**
* setClassPrefix
*
* @param string $prefix
*/
public function setClassPrefix($prefix)
{
$this->_classPrefix = $prefix;
}
/**
* getClassPrefix
*
* @return string
*/
public function getClassPrefix()
{
return $this->_classPrefix;
}
/**
* contains
* checks if a resource exists under the given name
*
* @return boolean whether or not given resource name exists
*/
public function contains($name)
{
return isset($this->_resources[$name]);
}
/**
* bind
* binds a resource to a name
*
* @param string $name the name of the resource to bind
* @param mixed $value the value of the resource
* @return Sensei_Locator this object
*/
public function bind($name, $value)
{
$this->_resources[$name] = $value;
return $this;
}
/**
* locate
* locates a resource by given name and returns it
*
* @throws Doctrine_Locator_Exception if the resource could not be found
* @param string $name the name of the resource
* @return mixed the located resource
*/
public function locate($name)
{
if (isset($this->_resources[$name])) {
return $this->_resources[$name];
} else {
$className = $name;
if ( ! class_exists($className)) {
$name = explode('.', $name);
$name = array_map('strtolower', $name);
$name = array_map('ucfirst', $name);
$name = implode('_', $name);
$className = $this->_classPrefix . $name;
if ( ! class_exists($className)) {
throw new Doctrine_Locator_Exception("Couldn't locate resource " . $className);
}
}
$this->_resources[$name] = new $className();
if ($this->_resources[$name] instanceof Doctrine_Locator_Injectable) {
$this->_resources[$name]->setLocator($this);
}
return $this->_resources[$name];
}
throw new Doctrine_Locator_Exception("Couldn't locate resource " . $name);
}
/**
* count
* returns the number of bound resources associated with
* this object
*
* @see Countable interface
* @return integer the number of resources
*/
public function count()
{
return count($this->_resources);
}
/**
* getIterator
* returns an ArrayIterator that iterates through all
* bound resources
*
* @return ArrayIterator an iterator for iterating through
* all bound resources
*/
public function getIterator()
{
return new ArrayIterator($this->_resources);
}
}
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