The dependset task compares a set of sources with a set of target files. If any of the sources has been modified more recently than any of the target files, all of the target files are removed.
Sources and target files are specified via nested Resource Collections; sources can be resources of any type, while targets are restricted to files only. At least one set of sources and one set of targets is required.
Use a FileSet when you want to use wildcard include or exclude patterns and don't care about missing files. Use a FileList when you want to consider the non-existence of a file as if it were out of date. If there are any non-existing files in any source or target FileList, all target files will be removed.
DependSet is useful to capture dependencies that are not or cannot be
determined algorithmically. For example, the <style> task only
compares the source XML file and XSLT stylesheet against the target
file to determined whether to restyle the source. Using dependset you
can extend this dependency checking to include a DTD or XSD file as
well as other stylesheets imported by the main stylesheet.
| Attribute | Description | Required |
| verbose | Makes the task list all deleted targets files and the reason why they get deleted. | No |
The <sources> element is a
Union into which
arbitrary resource collections can be nested. Since Apache Ant 1.7
The nested <srcfileset> element specifies a FileSet. All files included in
this fileset will be compared against all files included in all of the
<targetfileset> filesets and <targetfilelist>
filelists. Multiple <srcfileset> filesets may be specified.
The nested <srcfilelist> element specifies a FileList. All files included in
this filelist will be compared against all files included in all of the
<targetfileset> filesets and <targetfilelist>
filelists. Multiple <srcfilelist> filelists may be specified.
The <targets> element is a
Path and thus can
include any filesystem-based resource. Since Ant 1.7
The nested <targetfileset> element specifies a FileSet. All files included in
this fileset will be compared against all files included in all of the
<srcfileset> filesets and <sourcefilelist>
filelists, and if any are older, they are all deleted.
Multiple <targetfileset> filesets may be specified.
The nested <targetfilelist> element specifies a FileList. All files included in
this filelist will be compared against all files included in all of the
<srcfileset> filesets and <sourcefilelist>
filelists, and if any are older, they are all deleted.
Multiple <targetfilelist> filelists may be specified.
<dependset>
<srcfilelist
dir = "${dtd.dir}"
files = "paper.dtd,common.dtd"/>
<srcfilelist
dir = "${xsl.dir}"
files = "common.xsl"/>
<srcfilelist
dir = "${basedir}"
files = "build.xml"/>
<targetfileset
dir = "${output.dir}"
includes = "**/*.html"/>
</dependset>
In this example derived HTML files in the ${output.dir} directory will be removed if any are out-of-date with respect to:
If any of the sources in the above example does not exist, all target files will also be removed. To ignore missing sources instead, use filesets instead of filelists for the sources.