qadevOOo/runner/util/DynamicClassLoader.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18
  19 package util;
  20
  21 import java.lang.reflect.Constructor;
  22
  23 public class DynamicClassLoader {
  24
  25     /**
  26     * This method returns a class created by its name
  27     * created by call to <code>Class.forName()</code>.<p>
  28     * This method must be overridden if another loading
  29     * policy is required for Component and Interface
  30     * testing classes.
  31     * @param className The name of the class to create.
  32     * @return The created class.
  33     */
  34     private static Class<?> forName(String className)
  35         throws ClassNotFoundException {
  36
  37         return Class.forName(className) ;
  38     }
  39
  40     /**
  41      * Get an instance of a class. The empty constructor is used.
  42      * @param className The class to instantiate.
  43      * @return The instance of the class.
  44      */
  45     public Object getInstance(String className)
  46                                         throws IllegalArgumentException {
  47         try {
  48             Class<?> cls = DynamicClassLoader.forName(className);
  49             return cls.newInstance();
  50         } catch ( ClassNotFoundException e ) {
  51             throw new IllegalArgumentException("Couldn't find " + className
  52                     + " " + e);
  53         } catch ( IllegalAccessException e ) {
  54             throw new IllegalArgumentException("Couldn't access " + className
  55                     + " " + e);
  56         } catch ( InstantiationException e ) {
  57             throw new IllegalArgumentException("Couldn't instantiate " +
  58                             className + " " + e);
  59         }
  60     }
  61
  62     /**
  63      * Get an instance of a class. The constructor matching to the
  64      * given calls types is used and the instance is created using the arguments
  65      * for the constructor.
  66      * @param className The class to instantiate.
  67      * @param ctorClassTypes The class types matching to the constructor.
  68      * @param ctorArgs Arguments for the constructor.
  69      * @return The instance of the class.
  70      */
  71     public Object getInstance(String className, Class<?>[]ctorClassTypes, Object[] ctorArgs)
  72                                         throws IllegalArgumentException {
  73         try {
  74             Class<?> cls = DynamicClassLoader.forName(className);
  75             Constructor<?> ctor = cls.getConstructor(ctorClassTypes);
  76             System.out.println("ctor: " + ctor.getName() +  "  " + ctor.getModifiers());
  77
  78             return ctor.newInstance(ctorArgs);
  79         } catch ( ClassNotFoundException e ) {
  80             throw new IllegalArgumentException("Couldn't find " + className
  81                     + " " + e);
  82         } catch ( IllegalAccessException e ) {
  83             throw new IllegalArgumentException("Couldn't access " + className
  84                     + " " + e);
  85         } catch ( NoSuchMethodException e ) {
  86             throw new IllegalArgumentException("Couldn't find constructor for " + className
  87                     + " " + e);
  88         } catch ( java.lang.reflect.InvocationTargetException e ) {
  89             e.printStackTrace();
  90             throw new IllegalArgumentException("Couldn't invoke " +
  91                             className + " " + e);
  92         } catch ( InstantiationException e ) {
  93             throw new IllegalArgumentException("Couldn't instantiate " +
  94                             className + " " + e);
  95         }
  96     }
  97 }