<?php
/*
 * 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.doctrine-project.org>.
 */

namespace Doctrine\Common\Persistence\Mapping\Driver;

use Doctrine\Common\Cache\ArrayCache,
    Doctrine\Common\Annotations\AnnotationReader,
    Doctrine\Common\Annotations\AnnotationRegistry,
    Doctrine\Common\Persistence\Mapping\MappingException;

/**
 * The AnnotationDriver reads the mapping metadata from docblock annotations.
 *
 * @since 2.2
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author Jonathan H. Wage <jonwage@gmail.com>
 * @author Roman Borschel <roman@code-factory.org>
 */
abstract class AnnotationDriver implements MappingDriver
{
    /**
     * The AnnotationReader.
     *
     * @var AnnotationReader
     */
    protected $reader;

    /**
     * The paths where to look for mapping files.
     *
     * @var array
     */
    protected $paths = array();

    /**
     * The file extension of mapping documents.
     *
     * @var string
     */
    protected $fileExtension = '.php';

    /**
     * Cache for AnnotationDriver#getAllClassNames()
     *
     * @var array
     */
    protected $classNames;

    /**
     * Name of the entity annotations as keys
     *
     * @var array
     */
    protected $entityAnnotationClasses = array();

    /**
     * Initializes a new AnnotationDriver that uses the given AnnotationReader for reading
     * docblock annotations.
     *
     * @param AnnotationReader $reader The AnnotationReader to use, duck-typed.
     * @param string|array $paths One or multiple paths where mapping classes can be found.
     */
    public function __construct($reader, $paths = null)
    {
        $this->reader = $reader;
        if ($paths) {
            $this->addPaths((array) $paths);
        }
    }

    /**
     * Append lookup paths to metadata driver.
     *
     * @param array $paths
     */
    public function addPaths(array $paths)
    {
        $this->paths = array_unique(array_merge($this->paths, $paths));
    }

    /**
     * Retrieve the defined metadata lookup paths.
     *
     * @return array
     */
    public function getPaths()
    {
        return $this->paths;
    }

    /**
     * Retrieve the current annotation reader
     *
     * @return AnnotationReader
     */
    public function getReader()
    {
        return $this->reader;
    }

    /**
     * Get the file extension used to look for mapping files under
     *
     * @return void
     */
    public function getFileExtension()
    {
        return $this->fileExtension;
    }

    /**
     * Set the file extension used to look for mapping files under
     *
     * @param string $fileExtension The file extension to set
     * @return void
     */
    public function setFileExtension($fileExtension)
    {
        $this->fileExtension = $fileExtension;
    }

    /**
     * Whether the class with the specified name is transient. Only non-transient
     * classes, that is entities and mapped superclasses, should have their metadata loaded.
     *
     * A class is non-transient if it is annotated with an annotation
     * from the {@see AnnotationDriver::entityAnnotationClasses}.
     *
     * @param string $className
     * @return boolean
     */
    public function isTransient($className)
    {
        $classAnnotations = $this->reader->getClassAnnotations(new \ReflectionClass($className));

        foreach ($classAnnotations as $annot) {
            if (isset($this->entityAnnotationClasses[get_class($annot)])) {
                return false;
            }
        }
        return true;
    }

    /**
     * {@inheritDoc}
     */
    public function getAllClassNames()
    {
        if ($this->classNames !== null) {
            return $this->classNames;
        }

        if (!$this->paths) {
            throw MappingException::pathRequired();
        }

        $classes = array();
        $includedFiles = array();

        foreach ($this->paths as $path) {
            if ( ! is_dir($path)) {
                throw MappingException::fileMappingDriversRequireConfiguredDirectoryPath($path);
            }

            $iterator = new \RegexIterator(
                new \RecursiveIteratorIterator(
                    new \RecursiveDirectoryIterator($path, \FilesystemIterator::SKIP_DOTS),
                    \RecursiveIteratorIterator::LEAVES_ONLY
                ),
                '/^.+' . str_replace('.', '\.', $this->fileExtension) . '$/i',
                \RecursiveRegexIterator::GET_MATCH
            );

            foreach ($iterator as $file) {
                $sourceFile = realpath($file[0]);

                require_once $sourceFile;

                $includedFiles[] = $sourceFile;
            }
        }

        $declared = get_declared_classes();

        foreach ($declared as $className) {
            $rc = new \ReflectionClass($className);
            $sourceFile = $rc->getFileName();
            if (in_array($sourceFile, $includedFiles) && ! $this->isTransient($className)) {
                $classes[] = $className;
            }
        }

        $this->classNames = $classes;

        return $classes;
    }
}