ClassLoaderUtil.java

package org.apache.tika.util;

/*
 * 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.
 */
public class ClassLoaderUtil {

    @SuppressWarnings("unchecked")
    public static <T> T buildClass(Class<T> iface, String className) {

        ClassLoader loader = ClassLoader.getSystemClassLoader();
        Class<?> clazz;
        try {
            clazz = loader.loadClass(className);
            if (iface.isAssignableFrom(clazz)) {
                return (T) clazz.newInstance();
            }
            throw new IllegalArgumentException(iface.toString() + " is not assignable from " + className);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (InstantiationException e) {
            throw new RuntimeException(e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException(e);
        }

    }
}