heron/spi/src/java/org/apache/heron/spi/utils/ReflectionUtils.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.heron.spi.utils;

public final class ReflectionUtils {
  private ReflectionUtils() {

  }

  @SuppressWarnings("unchecked") // we don't know what T is until runtime
  public static <T> T newInstance(String className)
      throws ClassNotFoundException, InstantiationException, IllegalAccessException {
    return newInstance(ClassLoader.getSystemClassLoader(), className);
  }

  @SuppressWarnings("unchecked") // we don't know what T is until runtime
  public static <T> T newInstance(ClassLoader classLoader, String className)
      throws ClassNotFoundException, IllegalAccessException, InstantiationException {
    if (className == null) {
      throw new ClassNotFoundException("Can not instantiate class. className must not be null");
    }
    return (T) classLoader.loadClass(className).newInstance();
  }
}