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Posted to dev@commons.apache.org by Ola Berg <ol...@ports.se> on 2002/10/23 10:21:54 UTC
Re: [Lang] Validate
> Anyway, the class is hardly tough to write from scratch. (Mine doesn't have
> the fancy array/list checking methods)
Of course. I just want some sort of interface spec to build from, and as I know that you are good at naming things, I thought that you already had coined excellent names for the methods.
Initial interface spec:
//contains static utility methods that throws IAE,
class Validate
//throws if false: general utility
isTrue( boolean)
//most common, most other methods calls this as well before other checks
notNull( Object)
//throws if Object can't be assigned to a variable of type
isOfType( Object, Class type)
//throws if the array is empty
notEmpty( Object[])
//throws if the array contains null elements
noNullElements( Object [])
end class Validate
---
Other possible methods
* relevant checks for Strings and other common classes in java.lang (and primitives) such as
notEmpty( String s)
isPositive( int i)
isPositive( Number) //is Number good for this or do we need
* relevant checks for Collection classes (so that arrays and collections behaves the same) such as
notEmpty( Collection c)
noNullElements( Collection c)
* relevant checks for other common java.util classes too (Date etc)
* relevant checks for other common java classes (io and net, few javaprogs manages without lang, util, io and net)
----
Personally, I think that the two last points are overkill, but they raises a question: should we have some kind of (naming/design) pattern for creating validation utilities for other type, in order to promote consistency?
----
Important issue: Exception messages
Should each method have a String argument containing the messages? Or should each method exist in two versions, one that throws a default message and one that can take a provided message:
public static void noNullElements( Object[] array){
....
}
public static void noNullElements( Object[] array, String message){
....
}
What do you think?
/O
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