org.apache.tools.ant.types.selectors
Class DifferentSelector
- FileSelector
public class DifferentSelector
This selector selects files against a mapped set of target files, selecting
all those files which are different. A byte-by-byte comparision is performed
on equal length files; files with different lengths are deemed different
automatically; files with identical timestamps are viewed as matching by
default, unless you specify otherwise.
This is a useful selector to work with programs and tasks that don't handle
dependency checking properly; Even if a predecessor task always creates its
output files, followup tasks can be driven off copies made with a different
selector, so their dependencies are driven on the absolute state of the
files, not a timestamp.
Clearly, however, bulk file comparisons is inefficient; anything that can
use timestamps is to be preferred. If this selector must be used, use it
over as few files as possible, perhaps following it with an <uptodate;>
to keep the descendent routines conditional.
protected boolean | selectionTest(File srcfile, File destfile) - this test is our selection test that compared the file with the destfile
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void | setIgnoreFileTimes(boolean ignoreFileTimes) - This flag tells the selector to ignore file times in the comparison
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checkAttributesAllowed , checkChildrenAllowed , circularReference , dieOnCircularReference , getCheckedRef , getDescription , getRefid , isChecked , isReference , noChildrenAllowed , setChecked , setDescription , setRefid , tooManyAttributes |
selectionTest
protected boolean selectionTest(File srcfile,
File destfile)
this test is our selection test that compared the file with the destfile
- selectionTest in interface MappingSelector
srcfile
- the source filedestfile
- the destination file
- true if the files are different
setIgnoreFileTimes
public void setIgnoreFileTimes(boolean ignoreFileTimes)
This flag tells the selector to ignore file times in the comparison
ignoreFileTimes
- if true ignore file times
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