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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Loader
* @subpackage Autoloader
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @version $Id: Resource.php 19190 2009-11-23 12:43:42Z bate $
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/** Zend_Loader_Autoloader_Interface */
require_once 'Zend/Loader/Autoloader/Interface.php';
/**
* Resource loader
*
* @uses Zend_Loader_Autoloader_Interface
* @package Zend_Loader
* @subpackage Autoloader
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Loader_Autoloader_Resource implements Zend_Loader_Autoloader_Interface
{
/**
* @var string Base path to resource classes
*/
protected $_basePath;
/**
* @var array Components handled within this resource
*/
protected $_components = array();
/**
* @var string Default resource/component to use when using object registry
*/
protected $_defaultResourceType;
/**
* @var string Namespace of classes within this resource
*/
protected $_namespace;
/**
* @var array Available resource types handled by this resource autoloader
*/
protected $_resourceTypes = array();
/**
* Constructor
*
* @param array|Zend_Config $options Configuration options for resource autoloader
* @return void
*/
public function __construct($options)
{
if ($options instanceof Zend_Config) {
$options = $options->toArray();
}
if (!is_array($options)) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('Options must be passed to resource loader constructor');
}
$this->setOptions($options);
$namespace = $this->getNamespace();
if ((null === $namespace)
|| (null === $this->getBasePath())
) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('Resource loader requires both a namespace and a base path for initialization');
}
if (!empty($namespace)) {
$namespace .= '_';
}
Zend_Loader_Autoloader::getInstance()->unshiftAutoloader($this, $namespace);
}
/**
* Overloading: methods
*
* Allow retrieving concrete resource object instances using 'get<Resourcename>()'
* syntax. Example:
* <code>
* $loader = new Zend_Loader_Autoloader_Resource(array(
* 'namespace' => 'Stuff_',
* 'basePath' => '/path/to/some/stuff',
* ))
* $loader->addResourceType('Model', 'models', 'Model');
*
* $foo = $loader->getModel('Foo'); // get instance of Stuff_Model_Foo class
* </code>
*
* @param string $method
* @param array $args
* @return mixed
* @throws Zend_Loader_Exception if method not beginning with 'get' or not matching a valid resource type is called
*/
public function __call($method, $args)
{
if ('get' == substr($method, 0, 3)) {
$type = strtolower(substr($method, 3));
if (!$this->hasResourceType($type)) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception("Invalid resource type $type; cannot load resource");
}
if (empty($args)) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception("Cannot load resources; no resource specified");
}
$resource = array_shift($args);
return $this->load($resource, $type);
}
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception("Method '$method' is not supported");
}
/**
* Helper method to calculate the correct class path
*
* @param string $class
* @return False if not matched other wise the correct path
*/
public function getClassPath($class)
{
$segments = explode('_', $class);
$namespaceTopLevel = $this->getNamespace();
$namespace = '';
if (!empty($namespaceTopLevel)) {
$namespace = array_shift($segments);
if ($namespace != $namespaceTopLevel) {
// wrong prefix? we're done
return false;
}
}
if (count($segments) < 2) {
// assumes all resources have a component and class name, minimum
return false;
}
$final = array_pop($segments);
$component = $namespace;
$lastMatch = false;
do {
$segment = array_shift($segments);
$component .= empty($component) ? $segment : '_' . $segment;
if (isset($this->_components[$component])) {
$lastMatch = $component;
}
} while (count($segments));
if (!$lastMatch) {
return false;
}
$final = substr($class, strlen($lastMatch) + 1);
$path = $this->_components[$lastMatch];
$classPath = $path . '/' . str_replace('_', '/', $final) . '.php';
if (Zend_Loader::isReadable($classPath)) {
return $classPath;
}
return false;
}
/**
* Attempt to autoload a class
*
* @param string $class
* @return mixed False if not matched, otherwise result if include operation
*/
public function autoload($class)
{
$classPath = $this->getClassPath($class);
if (false !== $classPath) {
return include $classPath;
}
return false;
}
/**
* Set class state from options
*
* @param array $options
* @return Zend_Loader_Autoloader_Resource
*/
public function setOptions(array $options)
{
$methods = get_class_methods($this);
foreach ($options as $key => $value) {
$method = 'set' . ucfirst($key);
if (in_array($method, $methods)) {
$this->$method($value);
}
}
return $this;
}
/**
* Set namespace that this autoloader handles
*
* @param string $namespace
* @return Zend_Loader_Autoloader_Resource
*/
public function setNamespace($namespace)
{
$this->_namespace = rtrim((string) $namespace, '_');
return $this;
}
/**
* Get namespace this autoloader handles
*
* @return string
*/
public function getNamespace()
{
return $this->_namespace;
}
/**
* Set base path for this set of resources
*
* @param string $path
* @return Zend_Loader_Autoloader_Resource
*/
public function setBasePath($path)
{
$this->_basePath = (string) $path;
return $this;
}
/**
* Get base path to this set of resources
*
* @return string
*/
public function getBasePath()
{
return $this->_basePath;
}
/**
* Add resource type
*
* @param string $type identifier for the resource type being loaded
* @param string $path path relative to resource base path containing the resource types
* @param null|string $namespace sub-component namespace to append to base namespace that qualifies this resource type
* @return Zend_Loader_Autoloader_Resource
*/
public function addResourceType($type, $path, $namespace = null)
{
$type = strtolower($type);
if (!isset($this->_resourceTypes[$type])) {
if (null === $namespace) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('Initial definition of a resource type must include a namespace');
}
$namespaceTopLevel = $this->getNamespace();
$namespace = ucfirst(trim($namespace, '_'));
$this->_resourceTypes[$type] = array(
'namespace' => empty($namespaceTopLevel) ? $namespace : $namespaceTopLevel . '_' . $namespace,
);
}
if (!is_string($path)) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('Invalid path specification provided; must be string');
}
$this->_resourceTypes[$type]['path'] = $this->getBasePath() . '/' . rtrim($path, '\/');
$component = $this->_resourceTypes[$type]['namespace'];
$this->_components[$component] = $this->_resourceTypes[$type]['path'];
return $this;
}
/**
* Add multiple resources at once
*
* $types should be an associative array of resource type => specification
* pairs. Each specification should be an associative array containing
* minimally the 'path' key (specifying the path relative to the resource
* base path) and optionally the 'namespace' key (indicating the subcomponent
* namespace to append to the resource namespace).
*
* As an example:
* <code>
* $loader->addResourceTypes(array(
* 'model' => array(
* 'path' => 'models',
* 'namespace' => 'Model',
* ),
* 'form' => array(
* 'path' => 'forms',
* 'namespace' => 'Form',
* ),
* ));
* </code>
*
* @param array $types
* @return Zend_Loader_Autoloader_Resource
*/
public function addResourceTypes(array $types)
{
foreach ($types as $type => $spec) {
if (!is_array($spec)) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('addResourceTypes() expects an array of arrays');
}
if (!isset($spec['path'])) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('addResourceTypes() expects each array to include a paths element');
}
$paths = $spec['path'];
$namespace = null;
if (isset($spec['namespace'])) {
$namespace = $spec['namespace'];
}
$this->addResourceType($type, $paths, $namespace);
}
return $this;
}
/**
* Overwrite existing and set multiple resource types at once
*
* @see Zend_Loader_Autoloader_Resource::addResourceTypes()
* @param array $types
* @return Zend_Loader_Autoloader_Resource
*/
public function setResourceTypes(array $types)
{
$this->clearResourceTypes();
return $this->addResourceTypes($types);
}
/**
* Retrieve resource type mappings
*
* @return array
*/
public function getResourceTypes()
{
return $this->_resourceTypes;
}
/**
* Is the requested resource type defined?
*
* @param string $type
* @return bool
*/
public function hasResourceType($type)
{
return isset($this->_resourceTypes[$type]);
}
/**
* Remove the requested resource type
*
* @param string $type
* @return Zend_Loader_Autoloader_Resource
*/
public function removeResourceType($type)
{
if ($this->hasResourceType($type)) {
$namespace = $this->_resourceTypes[$type]['namespace'];
unset($this->_components[$namespace]);
unset($this->_resourceTypes[$type]);
}
return $this;
}
/**
* Clear all resource types
*
* @return Zend_Loader_Autoloader_Resource
*/
public function clearResourceTypes()
{
$this->_resourceTypes = array();
$this->_components = array();
return $this;
}
/**
* Set default resource type to use when calling load()
*
* @param string $type
* @return Zend_Loader_Autoloader_Resource
*/
public function setDefaultResourceType($type)
{
if ($this->hasResourceType($type)) {
$this->_defaultResourceType = $type;
}
return $this;
}
/**
* Get default resource type to use when calling load()
*
* @return string|null
*/
public function getDefaultResourceType()
{
return $this->_defaultResourceType;
}
/**
* Object registry and factory
*
* Loads the requested resource of type $type (or uses the default resource
* type if none provided). If the resource has been loaded previously,
* returns the previous instance; otherwise, instantiates it.
*
* @param string $resource
* @param string $type
* @return object
* @throws Zend_Loader_Exception if resource type not specified or invalid
*/
public function load($resource, $type = null)
{
if (null === $type) {
$type = $this->getDefaultResourceType();
if (empty($type)) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('No resource type specified');
}
}
if (!$this->hasResourceType($type)) {
require_once 'Zend/Loader/Exception.php';
throw new Zend_Loader_Exception('Invalid resource type specified');
}
$namespace = $this->_resourceTypes[$type]['namespace'];
$class = $namespace . '_' . ucfirst($resource);
if (!isset($this->_resources[$class])) {
$this->_resources[$class] = new $class;
}
return $this->_resources[$class];
}
}
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