Hi Eric,
Hello Fabian,
thank you very much for the explanation. My documentation reference was
http://qooxdoo.org/documentation/0.8/interfaces (0.8 / Interfaces) which
according to you seems to be outdated.
I've update the wiki. Thanks for pointing me to this documentation error.
The only question remaining: Why does Class.hasInterface() deliver
"false" (in the example below)? This is not important for my current
project - im just curious.
There was another documentation problem in the API doc of
"hasInterface". The first parameter must be a class. Instances will not
be checked.
Instead of
qx.Class.hasInterface(test, itest.IMyInterface)
you have to write
qx.Class.hasInterface(test.constructor, itest.IMyInterface)
I've fixed this as well.
Best Fabian
Regards, eB.
Fabian Jakobs schrieb:
Hi Eric,
With 0.8 we slightly changed the way interfaces are verified. Now we
expect the verify methods to raise an exception if a precondition isn't
satisfied. The reason for this change was that we ended up with lots of
interface methods simply returning "true", further we unified all checks
with the checks in "qx.core.Assertion".
In the interface you can make use of all the assertion methods defined
in MAssert:
testMe: function() { this.fail("You should not see this!"); }
testYou: function(you) { this.assertString(you); }
Did you find any references in the documentation still mentioning the
old behaviour?
Best Fabian
Michael Helwig schrieb:
Hey Eric,
have you tried leaving the brackets "[" and "]" away in your interface
declaration? I'm not sure what they are there for, I have never used
them and my interface implementations work.
Best,
Michael
Eric Brachmann schrieb:
Hello,
working on a project with qooxdoo I recognized, that the preconditions I
set in an interface were not evaluated correctly. It seems that my
classes do not implement their interfaces at all, although the code
looks fine and no error is thrown.
An example to illustrate the issue:
IMyInterface.js:
qx.Interface.define("itest.IMyInterface",
{
members:
{
testMe: function() { return false; }
}
});
MyClass.js
qx.Class.define("itest.MyClass",
{
extend: qx.core.Object,
implement: [itest.IMyInterface],
members:
{
testMe: function() { alert("You should not see this!"); }
}
});
Application.js (excerpt):
...
var test = new itest.MyClass();
alert("implements interface: "
+ qx.Class.implementsInterface(test, itest.IMyInterface)
+ ", has interface: "
+ qx.Class.hasInterface(test, itest.IMyInterface));
test.testMe();
...
The output is "implements interface: true, has interface: false" as if
the implement statement in the class definition is being ignored.
The testMe() method gets executed even though the precondition of the
interface evaluates to false.
A project of this simple example is avaiable here:
http://www.hatter.de/studium/itest.zip
It would be very kind if someone could enlighten me.
Regards, eB.
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OpenSolaris 2009.06 is a cutting edge operating system for enterprises
looking to deploy the next generation of Solaris that includes the latest
innovations from Sun and the OpenSource community. Download a copy and
enjoy capabilities such as Networking, Storage and Virtualization.
Go to: http://p.sf.net/sfu/opensolaris-get
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