Hi,
I'm subscribed to this group a very short time. As I don't know if
these things have been discussed before I won't submit code right
know - maybe somebody else has already done something similar (which
would have happened to my own version of a JUnit task).
What I'm thinking about is a more general form of the Available task,
something like
<setif property="NAME" value="VALUE" conditiontester="CLASSNAME"
condition="CONDITION" />
Where conditiontester would implement something like
interface ConditionTester {
public void setCondition(String condition);
public boolean testCondition() throws BuildException;
}
This would set the property named NAME to VALUE if CONDITION has been
evaluated to true (false in the case of setunless) by an instance of
CLASSNAME.
Furthermore setif/unless should allow for some built-in conditions (for a
proposal how to add new built-ins without changing too much code see my
other mail):
* fileavailable, resourceavailable and classavailable
can quite easily be implemented by minor modifications to Available
to implement ConditionTester
* isset
checks whether another property is set
* istrue
checks whether another property is set and evaluates to true
* equals
compares to Strings with a Syntax similar to KeySubst. The separator
char could be the first char. Something like
<setunless equals="*${jdbc.version}*1.0" property="files.to.ignore"
value="*1_0*" />
<setunless equals="*${jdbc.version}*2.0" property="files.to.ignore"
value="*2_0*" />
would make it easy to conditionally phase out files from
compilation.
* javaversion
some way to check the JVM version at (ant-) runtime. Maybe make this
three built-ins javaversionequals, javaversiongreater,
javaversionless.
* isexecutable
checks whether a given command can be executed.
I can't think of a portable way to implement this without actually
running the command.
I have already implemented such Tasks and most of the proposed
built-ins but the code would need some brush up before I submit it. My
primary goal is to get feedback on this first.
Stefan
