DifferentSelector (Apache Ant API)
Description: declaration: package: org.apache.tools.ant.types.selectors, class: DifferentSelector

Package 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:
  `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.

- ## 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

  Constructors
  Constructor
  Description
  `DifferentSelector()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `protected boolean`
  `selectionTest(File srcfile, 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

  `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`

  ### Methods inherited from class java.lang.Object

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

  ### Methods inherited from interface org.apache.tools.ant.types.selectors.FileSelector

  `isSelected`

- ## Constructor Details

  - ### DifferentSelector

    public DifferentSelector()

- ## Method Details

  - ### 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(File srcfile, 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