Am 14.01.2011 12:30, schrieb Stephen Colebourne:
2) Other utilities
These are prior art that users are familiar with, just as much as the JDK.
Google Guava - Objects:
public static<T> T firstNonNull(T first, T second)
why not? :
public static <T> T firstNonNull(T... values)
Commons Lang - ObjectUtils:
public static Object defaultIfNull(Object object, Object defaultValue)
Additionally we should define some common constants for performance reasons:
String.EMPTY = "";
Integer.EMPTY_ARRAY = new int[0];
...
public void process(String foo) {
Validate.notNull(foo);
if (foo.length()> 3) { ... }
}
Why not? :
Validate.notNull(foo, runnable)
I think, in case of an expected null value, the developer has a specific idea,
how to handle it.
A good candidate for closures!
Just throwing an exception should be reserved for _un_expected cases.
Don't forget, that we still have:
assert foo != null;
The suggestion of "nullChecked" is more fluent:
if (nullCheked(foo).length()> 3)
+1
Another alternative to failIfNull(x) which I like, because it clearly describes the default
operation of the method.
-Ulf
