<?php

/*
 * Copyright 2011 Johannes M. Schmitt <schmittjoh@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace JMS\SerializerBundle\Metadata;

use JMS\SerializerBundle\Metadata\Driver\DriverInterface;

class MetadataFactory
{
    private $driver;
    private $loadedMetadata = array();
    private $loadedClassMetadata = array();

    public function __construct(DriverInterface $driver)
    {
        $this->driver = $driver;
    }

    public function getMetadataForClass($className)
    {
        if (isset($this->loadedMetadata[$className])) {
            return $this->loadedMetadata[$className];
        }

        $metadata = new ClassHierarchyMetadata();
        foreach ($this->getClassHierarchy($className) as $class) {
            if (!isset($this->loadedClassMetadata[$name = $class->getName()])) {
                $this->loadedClassMetadata[$name] = $this->driver->loadMetadataForClass($class);
            }

            $metadata->addClass($this->loadedClassMetadata[$name]);
        }

        return $this->loadedMetadata[$className] = $metadata;
    }

    private function getClassHierarchy($class)
    {
        $refl = new \ReflectionClass($class);
        $classes = array();
        do {
            $classes[] = $refl;
        } while (false !== $refl = $refl->getParentClass());

        return array_reverse($classes, false);
    }
}