ParentClassLoaderFinder.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.openejb.core;

import org.apache.openejb.OpenEJB;
import org.apache.openejb.loader.SystemInstance;

public interface ParentClassLoaderFinder {
    ClassLoader FALLBACK = OpenEJB.class.getClassLoader();

    ClassLoader getParentClassLoader(final ClassLoader fallback);

    class Helper {
        public static ClassLoader get() {
            final ParentClassLoaderFinder parentFinder = SystemInstance.isInitialized() ?
                SystemInstance.get().getComponent(ParentClassLoaderFinder.class) : null;
            if (parentFinder != null) {
                return parentFinder.getParentClassLoader(FALLBACK);
            }
            return FALLBACK;
        }
    }
}