Class DifferentSelector
java.lang.Object
org.apache.tools.ant.ProjectComponent
org.apache.tools.ant.types.DataType
org.apache.tools.ant.types.selectors.BaseSelector
org.apache.tools.ant.types.selectors.MappingSelector
org.apache.tools.ant.types.selectors.DifferentSelector
- All Implemented Interfaces:
java.lang.Cloneable
,ResourceSelector
,FileSelector
public class DifferentSelector extends MappingSelector
This selector selects files against a mapped set of target files, selecting
all those files which are different.
Files with different lengths are deemed different
automatically
Files with identical timestamps are viewed as matching by
default, unless you specify otherwise.
Contents are compared if the lengths are the same
and the timestamps are ignored or the same,
except if you decide to ignore contents to gain speed.
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 descendant routines conditional.
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Field Summary
Fields inherited from class org.apache.tools.ant.types.selectors.MappingSelector
granularity, map, mapperElement, targetdir
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Constructor Summary
Constructors Constructor Description DifferentSelector()
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Method Summary
Modifier and Type Method Description protected boolean
selectionTest(java.io.File srcfile, java.io.File destfile)
this test is our selection test that compared the file with the destfilevoid
setIgnoreContents(boolean ignoreContents)
This flag tells the selector to ignore contentsvoid
setIgnoreFileTimes(boolean ignoreFileTimes)
This flag tells the selector to ignore file times in the comparisonMethods inherited from class org.apache.tools.ant.types.selectors.MappingSelector
addConfigured, createMapper, isSelected, setGranularity, setTargetdir, verifySettings
Methods inherited from class org.apache.tools.ant.types.selectors.BaseSelector
getError, setError, setError, validate
Methods inherited from class org.apache.tools.ant.types.DataType
checkAttributesAllowed, checkChildrenAllowed, circularReference, clone, dieOnCircularReference, dieOnCircularReference, dieOnCircularReference, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getDataTypeName, getRefid, invokeCircularReferenceCheck, isChecked, isReference, noChildrenAllowed, pushAndInvokeCircularReferenceCheck, setChecked, setRefid, tooManyAttributes, toString
Methods inherited from class org.apache.tools.ant.ProjectComponent
getDescription, getLocation, getProject, log, log, setDescription, setLocation, setProject
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Constructor Details
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DifferentSelector
public DifferentSelector()
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Method Details
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setIgnoreFileTimes
public void setIgnoreFileTimes(boolean ignoreFileTimes)This flag tells the selector to ignore file times in the comparison- Parameters:
ignoreFileTimes
- if true ignore file times
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setIgnoreContents
public void setIgnoreContents(boolean ignoreContents)This flag tells the selector to ignore contents- Parameters:
ignoreContents
- if true ignore contents- Since:
- ant 1.6.3
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selectionTest
protected boolean selectionTest(java.io.File srcfile, java.io.File destfile)this test is our selection test that compared the file with the destfile- Specified by:
selectionTest
in classMappingSelector
- Parameters:
srcfile
- the source filedestfile
- the destination file- Returns:
- true if the files are different
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