/scalate-core/src/main/scala/org/fusesource/scalate/osgi/BundleClassLoader.scala

/**
 * Copyright (C) 2009-2011 the original author or authors.
 * See the notice.md file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * 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.
 */
package org.fusesource.scalate.osgi

import org.osgi.framework.Bundle

/**
 * A helper class to determine if the class loader provides access to an OSGi Bundle instance
 */
object BundleClassLoader {

  type BundleClassLoader = {
    def getBundle: Bundle
  }

  def unapply(ref: AnyRef): Option[BundleClassLoader] = {
    if (ref == null) return None
    try {
      val method = ref.getClass.getMethod("getBundle")
      if (method.getReturnType == classOf[Bundle])
        Some(ref.asInstanceOf[BundleClassLoader])
      else
        None
    } catch {
      case e: NoSuchMethodException => None
    }
  }
}