Yes this helps a great deal - it helps me to decide to cut my losses ;)
I have one more throw of the dice, which is to take a look at the
BuildListener
code - maybe, just maybe Ant will be kind enough to deliver me the
correct
target/task so that I can change the attributes before execution.
We shall see...
Thanks
- Ashley
On 28 Oct 2005, at 18:02, Dale Anson wrote:
Hi Ashley,
It is that hard, and maybe even harder. Antelope has a progress
bar to show how progress of a build. It tries to count the number
of tasks that will be executed prior to the build starting, then
updates the progress bar based on the taskFinished build events, so
basically, it is traversing the tree as you're attempting. Here are
the comments at the top of that class:
"The progress bar show progress of a running Ant target by counting
the number
of tasks that the target performs and incrementing the progress bar
as each
task is completed. The assumption is that a single target will be
called.
While this target may call other targets, the progress is based on
the initial
target. The initial target must be set prior to the build starting
by calling
<code>setExecutingTarget</code>.
<p>
Ant is not particularly friendly about providing information about
itself --
Project does not tell which target is currently executing,
BuildEvent does not
tell which target started the execution cycle, TaskContainer
provides no
information about nested tasks, and so on. This class has a number
of hacks
to get around these limitiations, some of which are strictly
against the
spirit of Java programming (e.g., I use PrivilegedAccessor to read
the private
fields in RuntimeConfigurable). These hacks make this a fragile
class as it
is not strictly based on the public Ant API.
<p>
Ant 1.6 made it even harder. This class needs a bit more work."
This progress listener worked fairly well with Ant 1.5, not as well
with Ant 1.6, but you might get some pointers from it since you're
using 1.5.2. You do need access to the "children" field in
RuntimeConfigurable, I didn't find a way to get it without
resorting to cheating with PrivilegedAccessor.
You can see the code for the progress listener at:
http://antelope.tigris.org/source/browse/antelope/src/ise/antelope/
common/AntProgressListener.java?rev=1.5&view=markup
The PrivilegedAccessor is at:
http://antelope.tigris.org/source/browse/antelope/src/ise/library/
PrivilegedAccessor.java?rev=1.4&view=markup
Hope this helps!
Dale
Ashley Williams wrote:
Hi,
I'm trying to write a method in java that takes a root target and
then walks down the task tree until it comes to the desired
object, but don't seem to find the api to do this. I sort of got
it to work in Ant 1.6.2 but wasn't really happy with the results
as I still don't fully understand what I've written:
However I need to use Ant 1.5.2 which is missing two crucial
methods: RuntimeConfigurableWrapper.getChildren and
RuntimeConfigurable.getProxy() - is there anything I should be
using in it's place? Is my strategy the right one?
I have a hunch that I'm doing the wrong thing as no tree should
be this difficult to walk as i seem to have made it.
Many Thanks
- AW
/**
* Recursively searches the given task until a match is
found for the given path.
* @param searchTask
* @param pathComponents
* @param pathIndex
* @return
*/
private Object findInTask(Task searchTask, String[]
pathComponents, int pathIndex) {
Object resultObj;
boolean morePathComponents = pathIndex <
pathComponents.length;
if (morePathComponents) {
resultObj = null;
Enumeration children =
searchTask.getRuntimeConfigurableWrapper().getChildren();
search:
while (children.hasMoreElements()) {
RuntimeConfigurable child =
(RuntimeConfigurable) children.nextElement();
if (child.getElementTag().equals
(pathComponents [pathIndex])) {
// we have a match but need to check if
there are more children to recurse
Object childProxy = child.getProxy();
if (childProxy instanceof Task) {
resultObj = findInTask((Task)
childProxy, pathComponents, pathIndex + 1);
} else {
resultObj = childProxy;
}
break search;
}
}
} else {
resultObj = searchTask;
}
return resultObj;
}
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