Examples of de.susebox.java.lang.ThrowableList

de.susebox.java.lang.ThrowableList
This interface should be implemented by classes derived from {@link java.lang.Throwable}that may contain a stacked, additional or wrapped throwable.
Such cases are common when
- a method implements a certain interface method that allows for a specific throwable like IOException, but the method itself may encounter a different throwable type like SQLException (wrapped throwable)
- one application layer catches an throwable only to add its specific information in form of another throwable (throwable stack, nested throwable like in SQLException or MessagingException).
We provide the expected code in block comments starting with -->, terminated by -->. Note that the provided code also includes a new implementation of the base class method {@link java.lang.Throwable#getMessage} using the textformatting capabilities of {@link java.text.MessageFormat}.
Note: This interface replaces the formerly used ExceptionList interface.
Note: With JDK 1.4, the chained exception facility is available, that implements a Throwable stack (or list of causes) already in {@link java.lang.Throwable}. Still, the notion of a wrapped exception and the delayed formatting is a reason for this interface.
@version 1.00, 2001/06/26 @author Heiko Blau

    String                    msg       = "This is an illegal argument.";
    IllegalArgumentException  argEx     = new IllegalArgumentException(msg);
    
    // construct the exception to test
    Constructor   constr  = Class.forName(_classToTest).getConstructor(paraTypes);
    ThrowableList ex      = (ThrowableList)constr.newInstance(new Object[] { argEx } );


    // do the checks
    assertTrue("rtEx: Wrapper exception not recognized.", ex.isWrapper());
    assertTrue("rtEx: Didn't retrieve the wrapped exception.", ex.getCause() == argEx);
    assertTrue("rtEx: Messages not equal.", ((Exception)ex).getMessage().equals(argEx.getMessage()));
  }

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    IllegalArgumentException  argEx     = new IllegalArgumentException(msg);
    Class[]                   paraTypes = new Class[] { new Throwable().getClass(), msg.getClass(), objArray.getClass() };
    
    // construct the exception to test
    Constructor   constr  = Class.forName(_classToTest).getConstructor(paraTypes);
    ThrowableList ex1     = (ThrowableList)constr.newInstance(new Object[] { argEx, format, new Object[] { new Integer(1), _classToTest } } );
    ThrowableList ex2     = (ThrowableList)constr.newInstance(new Object[] { ex1,   format, new Object[] { new Integer(2), _classToTest } } );


    // do the checks
    assertTrue("ex1: False wrapper exception.", ! ex1.isWrapper());
    assertTrue("ex2: False wrapper exception.", ! ex2.isWrapper());
    assertTrue("ex1: Didn't retrieve the nested exception.", ex1.getCause() == argEx);
    assertTrue("ex2: Didn't retrieve the first nested exception.", ex2.getCause() == ex1);
    assertTrue("ex2: Didn't retrieve the second nested exception.", ((ThrowableList)ex2.getCause()).getCause() == argEx);
    assertTrue("ex1: Format not found.", ex1.getFormat() == format);
    assertTrue("ex2: Format not found.", ex2.getFormat() == format);
  }

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    Object[]  paras     = new Object[] { _classToTest, "bad weather", "myself" };
    Class[]   paraTypes = new Class[] { format.getClass(), paras.getClass() };
    
    // construct the exception to test
    Constructor   constr  = Class.forName(_classToTest).getConstructor(paraTypes);
    ThrowableList ex      = (ThrowableList)constr.newInstance(new Object[] { format, paras } );


    // do the checks
    assertTrue("Format not found.", ex.getFormat() == format);
    
    String str1 = MessageFormat.format(format, paras);
    String str2 = ((Exception)ex).getMessage();
    assertTrue("Formating failed. Expected \"" + str1 + "\", got \"" + str2 + "\".",
              str1.equals(str2));

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de.susebox.TestExceptions

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