public static Object createDefaultInstance()

in core/src/main/java/flex/messaging/util/ClassUtil.java [103:174]
57 lines of code
15 McCabe index (conditional complexity)

    public static Object createDefaultInstance(Class cls, Class expectedInstance, boolean validate) {
        if (validate)
            validateCreation(cls);

        String type = cls.getName();
        try {
            Object instance = cls.newInstance();

            if (expectedInstance != null && !expectedInstance.isInstance(instance)) {
                // Given type '{name}' is not of expected type '{expectedName}'.
                MessageException ex = new MessageException();
                ex.setMessage(UNEXPECTED_TYPE, new Object[]{instance.getClass().getName(), expectedInstance.getName()});
                ex.setCode(MessageException.CODE_SERVER_RESOURCE_UNAVAILABLE);
                throw ex;
            }

            return instance;
        } catch (IllegalAccessException ia) {
            boolean details = false;
            StringBuffer message = new StringBuffer("Unable to create a new instance of type ");
            message.append(type);

            //Look for a possible cause...

            // Class might not have a suitable constructor?
            if (!hasValidDefaultConstructor(cls)) {
                details = true;
            }

            // Unable to create a new instance of type '{type}'.
            MessageException ex = new MessageException();
            ex.setMessage(CANNOT_CREATE_TYPE, new Object[]{type});
            if (details) {
                //Types must have a public, no arguments constructor
                ex.setDetails(CANNOT_CREATE_TYPE, "0");
            }
            ex.setCode(MessageException.CODE_SERVER_RESOURCE_UNAVAILABLE);
            throw ex;
        } catch (InstantiationException ine) {
            String variant = null;

            //Look for a possible cause...

            if (cls.isInterface()) // Class is really an interface?
                variant = "1"; // Interfaces cannot be instantiated
            else if (isAbstract(cls))
                variant = "2"; //Abstract types cannot be instantiated.
            else if (!hasValidDefaultConstructor(cls)) // Class might not have a suitable constructor?
                variant = "3"; // Types cannot be instantiated without a public, no arguments constructor.

            MessageException ex = new MessageException();
            ex.setMessage(CANNOT_CREATE_TYPE, new Object[]{type});
            if (variant != null)
                ex.setDetails(CANNOT_CREATE_TYPE, variant);
            ex.setCode(MessageException.CODE_SERVER_RESOURCE_UNAVAILABLE);
            throw ex;
        } catch (SecurityException se) {
            MessageException ex = new MessageException();
            ex.setMessage(SECURITY_ERROR, new Object[]{type});
            ex.setCode(MessageException.CODE_SERVER_RESOURCE_UNAVAILABLE);
            ex.setRootCause(se);
            throw ex;
        } catch (MessageException me) {
            throw me;
        } catch (Exception e) {
            MessageException ex = new MessageException();
            ex.setMessage(UNKNOWN_ERROR, new Object[]{type});
            ex.setCode(MessageException.CODE_SERVER_RESOURCE_UNAVAILABLE);
            ex.setRootCause(e);
            throw ex;
        }
    }