@SuppressWarnings("unchecked")
public void addDefaultEvaluator(final Operator operator, Class evaluatorClass) {
// define the constructor
Class[] evaluatorParameters = new Class[2];
evaluatorParameters[0] = ValueType.class;
evaluatorParameters[1] = Operator.class;

// get the constructor
	try {
	Constructor<BaseEvaluator> constructor;
		constructor = evaluatorClass.getConstructor( evaluatorParameters );
		
		// add feault operators
	addEvaluator(ValueType.ARRAY_TYPE, operator, constructor.newInstance(ValueType.ARRAY_TYPE, operator));	    	
	addEvaluator(ValueType.BIG_DECIMAL_TYPE, operator, constructor.newInstance(ValueType.BIG_DECIMAL_TYPE, operator));
	addEvaluator(ValueType.BIG_INTEGER_TYPE, operator, constructor.newInstance(ValueType.BIG_INTEGER_TYPE, operator));
	addEvaluator(ValueType.BOOLEAN_TYPE, operator, constructor.newInstance(ValueType.BOOLEAN_TYPE, operator));
	addEvaluator(ValueType.PBOOLEAN_TYPE, operator, constructor.newInstance(ValueType.PBOOLEAN_TYPE, operator));
	addEvaluator(ValueType.BYTE_TYPE, operator, constructor.newInstance(ValueType.BYTE_TYPE, operator));
	addEvaluator(ValueType.PBYTE_TYPE, operator, constructor.newInstance(ValueType.PBYTE_TYPE, operator));
	addEvaluator(ValueType.CHAR_TYPE, operator, constructor.newInstance(ValueType.CHAR_TYPE, operator));
	addEvaluator(ValueType.PCHAR_TYPE, operator, constructor.newInstance(ValueType.PCHAR_TYPE, operator));
	addEvaluator(ValueType.DATE_TYPE, operator, constructor.newInstance(ValueType.DATE_TYPE, operator));
	addEvaluator(ValueType.DOUBLE_TYPE, operator, constructor.newInstance(ValueType.DOUBLE_TYPE, operator));
	addEvaluator(ValueType.PDOUBLE_TYPE, operator, constructor.newInstance(ValueType.PDOUBLE_TYPE, operator));
	addEvaluator(ValueType.FLOAT_TYPE, operator, constructor.newInstance(ValueType.FLOAT_TYPE , operator));
	addEvaluator(ValueType.PFLOAT_TYPE, operator, constructor.newInstance(ValueType.PFLOAT_TYPE, operator));
	addEvaluator(ValueType.INTEGER_TYPE, operator, constructor.newInstance(ValueType.INTEGER_TYPE, operator));
	addEvaluator(ValueType.PINTEGER_TYPE, operator, constructor.newInstance(ValueType.PINTEGER_TYPE, operator));
	addEvaluator(ValueType.LONG_TYPE, operator, constructor.newInstance(ValueType.LONG_TYPE, operator));
	addEvaluator(ValueType.PLONG_TYPE, operator, constructor.newInstance(ValueType.PLONG_TYPE, operator));
	addEvaluator(ValueType.OBJECT_TYPE, operator, constructor.newInstance(ValueType.OBJECT_TYPE, operator));
	addEvaluator(ValueType.SHORT_TYPE, operator, constructor.newInstance(ValueType.SHORT_TYPE, operator));
	addEvaluator(ValueType.PSHORT_TYPE, operator, constructor.newInstance(ValueType.PSHORT_TYPE, operator));
	addEvaluator(ValueType.STRING_TYPE, operator, constructor.newInstance(ValueType.STRING_TYPE, operator));
	} catch (SecurityException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (NoSuchMethodException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IllegalArgumentException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (InstantiationException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IllegalAccessException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (InvocationTargetException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
}