type safe list filtering

gistfile1.java

@SuppressWarnings("unchecked")
	public <T extends Property> Collection<T> getList(final Class<T> t){

                final Properties props = new Properties();
                props.getProperty().add(new Property());
                props.getProperty().add(new SmtpProperty());

		return (Collection<T>) Collections2.filter(props.getProperty(), new Predicate<Property>() {
			@Override
			public boolean apply(Property input) {
				return t.isInstance(input);
			}
		});
	}