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All,
I've been using ant for ... ever. And I just got caught by something
that I didn't expect.
I've come to expect that property values cannot be changed after they
have been set; that is, they are write-once and then they are constants.
Due to a mistake in a somewhat complicated build file, I discovered
that pattern sets can be redefined in a way that is fairly surprising
to this seasoned ant user.
For example:
<target name="foo">
<echo>${toString:property.file.pattern}</echo>
<patternset id="property.file.pattern" includes="**/*.properties" />
<echo>${toString:property.file.pattern}</echo>
<patternset id="property.file.pattern" includes="**/*.xml" />
<echo>${toString:property.file.pattern}</echo>
</target>
Running this target will produce the following output:
foo:
[echo] ${toString:property.file.pattern}
[echo] patternSet{ includes: [**/*.properties] excludes: [] }
[echo] patternSet{ includes: [**/*.xml] excludes: [] }
Surprised? I definitely was.
My problem was that I had a target somewhere with something similar to:
<copy toDir="{dir}">
<fileset dir="${properties.dir}">
<patternset id="property.file.pattern" />
</fileset>
</copy>
Without realizing it, the above lines will redefine the patternset
called "property.file.pattern" to contain *nothing*. Oops. Definitely
my mistake, but ... I didn't really expect that ant would allow me to
override the previous definition of the patternset.
Is this intentional? Or should patternset definitions also be
immutable similar to property values?
Thanks,
- -chris
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=Zkat
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