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<?php



class Customweb_Annotation_Scanner {


	/**
	 * Returns a map with all annotation found for the given annotation name. The
	 * key of the map is the class name and the value is an instance of the annotation
	 * class.
	 *
	 * @param string $annotationName
	 * @param array $targetPackageNames
	 * @return Customweb_IAnnotation[]
	 */
	public function find($annotationName, $targetPackageNames = null) {

		try {
			Customweb_Core_Util_Class::loadLibraryClassByName($annotationName);
		}
		catch (Customweb_Core_Exception_ClassNotFoundException $e) {

		}

		$rs = array();
		$candiates = $this->findTargetClassCandidates($annotationName, $targetPackageNames);

		if (strstr($annotationName, '_') !== false) {
			$alternativeAnnotationName = substr($annotationName, strrpos($annotationName, '_') + 1);
			$candiates = array_merge($candiates, $this->findTargetClassCandidates($alternativeAnnotationName, $targetPackageNames));
		}

		foreach ($candiates as $candidate) {
			if (strpos($candidate, '::') === false) {
				Customweb_Core_Util_Class::loadLibraryClassByName($candidate);
				$reflection = new Customweb_Annotation_ReflectionAnnotatedClass($candidate);
				if ($reflection->hasAnnotation($annotationName)) {
					$rs[$reflection->getName()] = $reflection->getAnnotation($annotationName);
				}
			} else {
				$candiateClass = substr($candidate, 0, strpos($candidate, '::'));
				$candidateMethod = substr($candidate, strlen($candiateClass)+2);
				Customweb_Core_Util_Class::loadLibraryClassByName($candiateClass);
				$reflectionClass = new Customweb_Annotation_ReflectionAnnotatedClass($candiateClass);
				$reflectionMethod = $reflectionClass->getMethod($candidateMethod);
				if ($reflectionMethod->hasAnnotation($annotationName)) {
					$rs[$candidate] = $reflectionMethod->getAnnotation($annotationName);
				}
			}
		}

		return $rs;
	}

	private function findTargetClassCandidates($annotationName, $targetPackageNames) {
		$targets = Customweb_Annotation_Cache_Reader::getTargetsByAnnotationName($annotationName);

		if (is_array($targetPackageNames) && count($targetPackageNames) > 0) {
			$candidates = array();
			foreach ($targets as $target) {
				foreach ($targetPackageNames as $packageName) {
					if ($this->isMatching($target, $packageName)) {
						$candidates[] = $target;
					}
				}
			}
			return $candidates;
		}
		else {
			return $targets;
		}
	}

	/**
	 * Returns {@code true} when the given targetName is valid subpackage or class of the given packageName.
	 *
	 * @param string $targetName
	 * @param string $packagName
	 * @return boolean
	 */
	private function isMatching($targetName, $packageName) {
		$packageName = trim($packageName, '_');

		if ($targetName == $packageName) {
			return true;
		}

		if (strlen($targetName) <= strlen($packageName)) {
			return false;
		}

		if (strpos($targetName, $packageName) === 0
				&& (substr($targetName, strlen($packageName), 1) == '_' || substr($targetName, strlen($packageName), 2) == '::')) {
			return true;
		}
		return false;
	}

}