qadevOOo/runner/util/DynamicClassLoader.java

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  27
  28 package util;
  29
  30 import java.lang.reflect.Constructor;
  31
  32 public class DynamicClassLoader {
  33
  34     /**
  35     * This method returns a class created by its name
  36     * created by call to <code>Class.forName()</code>.<p>
  37     * This method must be overloaded if another loading
  38     * policy is required for Component and Interface
  39     * testing classes.
  40     * @param className The name of the class to create.
  41     * @return The created class.
  42     */
  43     public static Class forName(String className)
  44         throws ClassNotFoundException {
  45
  46         return Class.forName(className) ;
  47     }
  48
  49     /**
  50      * Get an instance of a class. The empty constructor is used.
  51      * @param className The class to instantiate.
  52      * @return The instance of the class.
  53      */
  54     public Object getInstance(String className)
  55                                         throws IllegalArgumentException {
  56         try {
  57             Class cls = DynamicClassLoader.forName(className);
  58             return cls.newInstance();
  59         } catch ( ClassNotFoundException e ) {
  60             throw new IllegalArgumentException("Couldn't find " + className
  61                     + " " + e);
  62         } catch ( IllegalAccessException e ) {
  63             throw new IllegalArgumentException("Couldn't access " + className
  64                     + " " + e);
  65         } catch ( InstantiationException e ) {
  66             throw new IllegalArgumentException("Couldn't instantiate " +
  67                             className + " " + e);
  68         }
  69     }
  70
  71     /**
  72      * Get an instance of a class. The constructor matching to the
  73      * arguments is used and the arguments are given to this constructor.
  74      * @param className The class to instantiate.
  75      * @param ctorArgs Arguments for the constructor.
  76      * @return The instance of the class.
  77      */
  78     public Object getInstance(String className, Object[] ctorArgs)
  79                                         throws IllegalArgumentException {
  80         Class[] ctorType = new Class[ctorArgs.length];
  81         for(int i=0; i<ctorType.length; i++) {
  82             ctorType[i] = ctorArgs[i].getClass();
  83         }
  84         return getInstance(className, ctorType, ctorArgs);
  85
  86     }
  87
  88     /**
  89      * Get an instance of a class. The constructor matching to the
  90      * given calss types is used and the instance is created using the arguments
  91      * for the constructor.
  92      * @param className The class to instantiate.
  93      * @param ctorClassTypes The class types matching to the constructor.
  94      * @param ctorArgs Arguments for the constructor.
  95      * @return The instance of the class.
  96      */
  97     public Object getInstance(String className, Class[]ctorClassTypes, Object[] ctorArgs)
  98                                         throws IllegalArgumentException {
  99         try {
 100             Class cls = DynamicClassLoader.forName(className);
 101             Constructor ctor = cls.getConstructor(ctorClassTypes);
 102             System.out.println("ctor: " + ctor.getName() +  "  " + ctor.getModifiers());
 103
 104             return ctor.newInstance(ctorArgs);
 105         } catch ( ClassNotFoundException e ) {
 106             throw new IllegalArgumentException("Couldn't find " + className
 107                     + " " + e);
 108         } catch ( IllegalAccessException e ) {
 109             throw new IllegalArgumentException("Couldn't access " + className
 110                     + " " + e);
 111         } catch ( NoSuchMethodException e ) {
 112             throw new IllegalArgumentException("Couldn't find constructor for " + className
 113                     + " " + e);
 114         } catch ( java.lang.reflect.InvocationTargetException e ) {
 115             e.printStackTrace();
 116             throw new IllegalArgumentException("Couldn't invoke " +
 117                             className + " " + e);
 118         } catch ( InstantiationException e ) {
 119             throw new IllegalArgumentException("Couldn't instantiate " +
 120                             className + " " + e);
 121         }
 122     }
 123 }