263 lines
8.9 KiB
PHP
263 lines
8.9 KiB
PHP
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<?php
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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.doctrine-project.org>.
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*/
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namespace Doctrine\Common;
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/**
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* A <tt>ClassLoader</tt> is an autoloader for class files that can be
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* installed on the SPL autoload stack. It is a class loader that either loads only classes
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* of a specific namespace or all namespaces and it is suitable for working together
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* with other autoloaders in the SPL autoload stack.
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*
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* If no include path is configured through the constructor or {@link setIncludePath}, a ClassLoader
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* relies on the PHP <code>include_path</code>.
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*
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* @author Roman Borschel <roman@code-factory.org>
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* @since 2.0
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*/
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class ClassLoader
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{
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/**
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* @var string PHP file extension
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*/
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protected $fileExtension = '.php';
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/**
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* @var string Current namespace
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*/
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protected $namespace;
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/**
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* @var string Current include path
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*/
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protected $includePath;
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/**
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* @var string PHP namespace separator
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*/
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protected $namespaceSeparator = '\\';
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/**
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* Creates a new <tt>ClassLoader</tt> that loads classes of the
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* specified namespace from the specified include path.
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*
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* If no include path is given, the ClassLoader relies on the PHP include_path.
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* If neither a namespace nor an include path is given, the ClassLoader will
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* be responsible for loading all classes, thereby relying on the PHP include_path.
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*
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* @param string $ns The namespace of the classes to load.
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* @param string $includePath The base include path to use.
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*/
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public function __construct($ns = null, $includePath = null)
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{
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$this->namespace = $ns;
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$this->includePath = $includePath;
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}
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/**
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* Sets the namespace separator used by classes in the namespace of this ClassLoader.
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*
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* @param string $sep The separator to use.
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*/
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public function setNamespaceSeparator($sep)
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{
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$this->namespaceSeparator = $sep;
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}
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/**
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* Gets the namespace separator used by classes in the namespace of this ClassLoader.
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*
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* @return string
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*/
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public function getNamespaceSeparator()
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{
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return $this->namespaceSeparator;
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}
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/**
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* Sets the base include path for all class files in the namespace of this ClassLoader.
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*
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* @param string $includePath
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*/
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public function setIncludePath($includePath)
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{
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$this->includePath = $includePath;
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}
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/**
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* Gets the base include path for all class files in the namespace of this ClassLoader.
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*
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* @return string
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*/
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public function getIncludePath()
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{
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return $this->includePath;
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}
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/**
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* Sets the file extension of class files in the namespace of this ClassLoader.
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*
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* @param string $fileExtension
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*/
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public function setFileExtension($fileExtension)
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{
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$this->fileExtension = $fileExtension;
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}
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/**
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* Gets the file extension of class files in the namespace of this ClassLoader.
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*
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* @return string
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*/
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public function getFileExtension()
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{
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return $this->fileExtension;
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}
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/**
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* Registers this ClassLoader on the SPL autoload stack.
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*/
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public function register()
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{
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spl_autoload_register(array($this, 'loadClass'));
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}
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/**
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* Removes this ClassLoader from the SPL autoload stack.
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*/
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public function unregister()
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{
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spl_autoload_unregister(array($this, 'loadClass'));
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}
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/**
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* Loads the given class or interface.
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*
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* @param string $classname The name of the class to load.
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* @return boolean TRUE if the class has been successfully loaded, FALSE otherwise.
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*/
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public function loadClass($className)
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{
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if ($this->namespace !== null && strpos($className, $this->namespace.$this->namespaceSeparator) !== 0) {
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return false;
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}
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require ($this->includePath !== null ? $this->includePath . DIRECTORY_SEPARATOR : '')
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. str_replace($this->namespaceSeparator, DIRECTORY_SEPARATOR, $className)
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. $this->fileExtension;
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return true;
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}
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/**
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* Asks this ClassLoader whether it can potentially load the class (file) with
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* the given name.
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*
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* @param string $className The fully-qualified name of the class.
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* @return boolean TRUE if this ClassLoader can load the class, FALSE otherwise.
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*/
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public function canLoadClass($className)
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{
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if ($this->namespace !== null && strpos($className, $this->namespace.$this->namespaceSeparator) !== 0) {
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return false;
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}
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$file = str_replace($this->namespaceSeparator, DIRECTORY_SEPARATOR, $className) . $this->fileExtension;
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if ($this->includePath !== null) {
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return file_exists($this->includePath . DIRECTORY_SEPARATOR . $file);
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}
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return (false !== stream_resolve_include_path($file));
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}
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/**
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* Checks whether a class with a given name exists. A class "exists" if it is either
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* already defined in the current request or if there is an autoloader on the SPL
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* autoload stack that is a) responsible for the class in question and b) is able to
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* load a class file in which the class definition resides.
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*
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* If the class is not already defined, each autoloader in the SPL autoload stack
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* is asked whether it is able to tell if the class exists. If the autoloader is
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* a <tt>ClassLoader</tt>, {@link canLoadClass} is used, otherwise the autoload
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* function of the autoloader is invoked and expected to return a value that
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* evaluates to TRUE if the class (file) exists. As soon as one autoloader reports
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* that the class exists, TRUE is returned.
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*
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* Note that, depending on what kinds of autoloaders are installed on the SPL
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* autoload stack, the class (file) might already be loaded as a result of checking
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* for its existence. This is not the case with a <tt>ClassLoader</tt>, who separates
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* these responsibilities.
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*
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* @param string $className The fully-qualified name of the class.
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* @return boolean TRUE if the class exists as per the definition given above, FALSE otherwise.
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*/
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public static function classExists($className)
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{
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if (class_exists($className, false) || interface_exists($className, false)) {
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return true;
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}
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foreach (spl_autoload_functions() as $loader) {
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if (is_array($loader)) { // array(???, ???)
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if (is_object($loader[0])) {
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if ($loader[0] instanceof ClassLoader) { // array($obj, 'methodName')
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if ($loader[0]->canLoadClass($className)) {
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return true;
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}
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} else if ($loader[0]->{$loader[1]}($className)) {
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return true;
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}
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} else if ($loader[0]::$loader[1]($className)) { // array('ClassName', 'methodName')
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return true;
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}
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} else if ($loader instanceof \Closure) { // function($className) {..}
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if ($loader($className)) {
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return true;
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}
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} else if (is_string($loader) && $loader($className)) { // "MyClass::loadClass"
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return true;
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}
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}
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return class_exists($className, false) || interface_exists($className, false);
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}
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/**
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* Gets the <tt>ClassLoader</tt> from the SPL autoload stack that is responsible
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* for (and is able to load) the class with the given name.
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*
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* @param string $className The name of the class.
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* @return The <tt>ClassLoader</tt> for the class or NULL if no such <tt>ClassLoader</tt> exists.
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*/
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public static function getClassLoader($className)
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{
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foreach (spl_autoload_functions() as $loader) {
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if (is_array($loader)
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&& $loader[0] instanceof ClassLoader
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&& $loader[0]->canLoadClass($className)
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) {
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return $loader[0];
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}
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}
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return null;
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}
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}
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