org.apache.tools.ant.types.selectors
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, 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 descendent routines conditional.

Field Summary

Fields inherited from class org.apache.tools.ant.types.selectors.MappingSelector

granularity, map, mapperElement, targetdir

Fields inherited from class org.apache.tools.ant.types.DataType

checked, ref

Fields inherited from class org.apache.tools.ant.ProjectComponent

description, location, project

Constructor Summary

DifferentSelector()

Method Summary

protected boolean	selectionTest(java.io.File srcfile, java.io.File destfile) this test is our selection test that compared the file with the destfile
void	setIgnoreContents(boolean ignoreContents) This flag tells the selector to ignore contents
void	setIgnoreFileTimes(boolean ignoreFileTimes) This flag tells the selector to ignore file times in the comparison

Methods inherited from class org.apache.tools.ant.types.selectors.MappingSelector

createMapper, isSelected, setGranularity, setTargetdir, verifySettings

Methods inherited from class org.apache.tools.ant.types.selectors.BaseSelector

getError, setError, validate

Methods inherited from class org.apache.tools.ant.types.DataType

checkAttributesAllowed, checkChildrenAllowed, circularReference, clone, dieOnCircularReference, dieOnCircularReference, dieOnCircularReference, getCheckedRef, getCheckedRef, getCheckedRef, getCheckedRef, getDataTypeName, getRefid, invokeCircularReferenceCheck, isChecked, isReference, noChildrenAllowed, setChecked, setRefid, tooManyAttributes, toString

Methods inherited from class org.apache.tools.ant.ProjectComponent

getDescription, getLocation, getProject, log, log, setDescription, setLocation, setProject

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

DifferentSelector

public DifferentSelector()

Method Detail

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

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

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 class MappingSelector

Parameters:

srcfile - the source file

destfile - the destination file

Returns:

true if the files are different