qadevOOo/runner/util/DynamicClassLoader.java

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   9  * $RCSfile: DynamicClassLoader.java,v $
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  30
  31 package util;
  32
  33 import java.lang.reflect.Constructor;
  34
  35 public class DynamicClassLoader {
  36
  37     /**
  38     * This method returns a class created by its name
  39     * created by call to <code>Class.forName()</code>.<p>
  40     * This method must be overloaded if another loading
  41     * policy is required for Component and Interface
  42     * testing classes.
  43     * @param className The name of the class to create.
  44     * @return The created class.
  45     */
  46     public static Class forName(String className)
  47         throws ClassNotFoundException {
  48
  49         return Class.forName(className) ;
  50     }
  51
  52     /**
  53      * Get an instance of a class. The empty constructor is used.
  54      * @param className The class to instantiate.
  55      * @return The instance of the class.
  56      */
  57     public Object getInstance(String className)
  58                                         throws IllegalArgumentException {
  59         try {
  60             Class cls = DynamicClassLoader.forName(className);
  61             return cls.newInstance();
  62         } catch ( ClassNotFoundException e ) {
  63             throw new IllegalArgumentException("Couldn't find " + className
  64                     + " " + e);
  65         } catch ( IllegalAccessException e ) {
  66             throw new IllegalArgumentException("Couldn't access " + className
  67                     + " " + e);
  68         } catch ( InstantiationException e ) {
  69             throw new IllegalArgumentException("Couldn't instantiate " +
  70                             className + " " + e);
  71         }
  72     }
  73
  74     /**
  75      * Get an instance of a class. The constructor matching to the
  76      * arguments is used and the arguments are given to this constructor.
  77      * @param className The class to instantiate.
  78      * @param ctorArgs Arguments for the constructor.
  79      * @return The instance of the class.
  80      */
  81     public Object getInstance(String className, Object[] ctorArgs)
  82                                         throws IllegalArgumentException {
  83         Class[] ctorType = new Class[ctorArgs.length];
  84         for(int i=0; i<ctorType.length; i++) {
  85             ctorType[i] = ctorArgs[i].getClass();
  86         }
  87         return getInstance(className, ctorType, ctorArgs);
  88
  89     }
  90
  91     /**
  92      * Get an instance of a class. The constructor matching to the
  93      * given calss types is used and the instance is created using the arguments
  94      * for the constructor.
  95      * @param className The class to instantiate.
  96      * @param ctorClassTypes The class types matching to the constructor.
  97      * @param ctorArgs Arguments for the constructor.
  98      * @return The instance of the class.
  99      */
 100     public Object getInstance(String className, Class[]ctorClassTypes, Object[] ctorArgs)
 101                                         throws IllegalArgumentException {
 102         try {
 103             Class cls = DynamicClassLoader.forName(className);
 104             Constructor ctor = cls.getConstructor(ctorClassTypes);
 105             System.out.println("ctor: " + ctor.getName() +  "  " + ctor.getModifiers());
 106
 107             return ctor.newInstance(ctorArgs);
 108         } catch ( ClassNotFoundException e ) {
 109             throw new IllegalArgumentException("Couldn't find " + className
 110                     + " " + e);
 111         } catch ( IllegalAccessException e ) {
 112             throw new IllegalArgumentException("Couldn't access " + className
 113                     + " " + e);
 114         } catch ( NoSuchMethodException e ) {
 115             throw new IllegalArgumentException("Couldn't find constructor for " + className
 116                     + " " + e);
 117         } catch ( java.lang.reflect.InvocationTargetException e ) {
 118             e.printStackTrace();
 119             throw new IllegalArgumentException("Couldn't invoke " +
 120                             className + " " + e);
 121         } catch ( InstantiationException e ) {
 122             throw new IllegalArgumentException("Couldn't instantiate " +
 123                             className + " " + e);
 124         }
 125     }
 126 }