package org.apache.rat.mp.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.
   */
  
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  
  public final class ConfigurationHelper {
  
      private ConfigurationHelper() {
          // prevent instantiation
      }
  
      public static <T> T newInstance(final Class<T> clazz, final String className)
              throws MojoExecutionException, MojoFailureException {
          try {
              final ClassLoader cl = Thread.currentThread()
                      .getContextClassLoader();
              @SuppressWarnings("unchecked") // incorrect cast will be caught below
              final T o = (T) cl.loadClass(className).newInstance();
  
              if (!clazz.isAssignableFrom(o.getClass())) {
                  throw new MojoFailureException("The class "
                          + o.getClass().getName() + " does not implement "
                          + clazz.getName());
              }
              return o;
          } catch (final InstantiationException e) {
              throw new MojoExecutionException("Failed to instantiate class "
                      + className + ": " + e.getMessage(), e);
          } catch (final ClassCastException e) {
              throw new MojoExecutionException("The class " + className
                      + " is not implementing " + clazz.getName() + ": "
                      + e.getMessage(), e);
          } catch (final IllegalAccessException e) {
              throw new MojoExecutionException("Illegal access to class "
                      + className + ": " + e.getMessage(), e);
          } catch (final ClassNotFoundException e) {
              throw new MojoExecutionException("Class " + className
                      + " not found: " + e.getMessage(), e);
          }
      }
  
  }