DifferentSelector (Apache Ant API)
Date: 2008-06-27

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## 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

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