| 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); |
| } |
| } |
| |
| } |