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From Ralph Goers <>
Subject Re: Expression Block
Date Wed, 15 Aug 2007 09:13:02 GMT

Carsten Ziegeler wrote:
> Ralph Goers wrote:
>> Carsten Ziegeler wrote:
>>> Yes, that's correct, but the api might use o.a.c.expression while the
>>> implementation should use a different package like o.a.c.e.impl (or
>>> something more appropriate). We should not have two modules providing
>>> classes in the same package.
>> Here I don't agree. The API should only contain interfaces, abstract
>> classes, classes that are fairly simple (for example, if they have
>> nothing but getters and setters) or classes that would always be common
>> to any possible implementation.  The impl should do all the real work.
> That's my saying :) I only try to say that all impl classes should use
> different package names
> than the api classes.
As I pointed out though, that can create problems for the implementor.  
As an example, you might have in an abstract class:

public void something(String parm1) {
    something(verify(parm1), null, null);

public void something(String parm1, String parm2) {
    something(parm1, parm2, null);

public void something(String parm1, String, parm2, String parm3) {
    doSomething(verifyP1(parm1), verifyP2(parm2), verifyP3(parm3));

protected abstract void doSomething(String parm1, String parm2, String 

This construct can't be implemented if the packages aren't the same.
> Carsten

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