Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## org.apache.commons.io.comparator
Class CompositeFileComparator

    java.lang.Object
      org.apache.commons.io.comparator.CompositeFileComparator

All Implemented Interfaces:
  Serializable, Comparator<File>

    public class CompositeFileComparator

extends Object
implements Serializable

Compare two files using a set of delegate file `Comparator`.

This comparator can be used to sort lists or arrays of files by combining a number other comparators.

Example of sorting a list of files by type (i.e. directory or file) and then by name:

           CompositeFileComparator comparator =
                           new CompositeFileComparator(
                                       DirectoryFileComparator.DIRECTORY_COMPARATOR,
                                       NameFileComparator.NAME_COMPARATOR);
           List<File> list = ...
           comparator.sort(list);

Since:
  Commons IO 2.0
Version:
  $Revision: 896991 $ $Date: 2010-01-07 20:03:42 +0000 (Thu, 07 Jan 2010) $
See Also:
  Serialized Form

Constructor Summary
`CompositeFileComparator(Comparator<File>... delegates)` Create a composite comparator for the set of delegate comparators.
`CompositeFileComparator(Iterable<Comparator<File>> delegates)` Create a composite comparator for the set of delegate comparators.

Method Summary
`int` | `compare(File file1, File file2)` Compare the two files using delegate comparators.
`File[]` | `sort(File... files)` Sort an array of files.
`List<File>` | `sort(List<File> files)` Sort a List of files.
`String` | `toString()` String representation of this file comparator.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface java.util.Comparator
`equals`

Constructor Detail

### CompositeFileComparator

    public CompositeFileComparator(Comparator<File>... delegates)

  Create a composite comparator for the set of delegate comparators.

  Parameters:
    `delegates` - The delegate file comparators

### CompositeFileComparator

    public CompositeFileComparator(Iterable<Comparator<File>> delegates)

  Create a composite comparator for the set of delegate comparators.

  Parameters:
    `delegates` - The delegate file comparators

Method Detail

### compare

    public int compare(File file1,
                       File file2)

  Compare the two files using delegate comparators.

  Specified by:
    `compare` in interface `Comparator<File>`
  Parameters:
    `file1` - The first file to compare
    `file2` - The second file to compare
  Returns:
    the first non-zero result returned from the delegate comparators or zero.

### toString

    public String toString()

  String representation of this file comparator.

  Returns:
    String representation of this file comparator

### sort

    public File[] sort(File... files)

  Sort an array of files.

  This method uses `Arrays.sort(Object[], Comparator)` and returns the original array.

  Parameters:
    `files` - The files to sort, may be null
  Returns:
    The sorted array
  Since:
    Commons IO 2.0

### sort

    public List<File> sort(List<File> files)

  Sort a List of files.

  This method uses `Collections.sort(List, Comparator)` and returns the original list.

  Parameters:
    `files` - The files to sort, may be null
  Returns:
    The sorted list
  Since:
    Commons IO 2.0

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Copyright © 2002-2010 The Apache Software Foundation. All Rights Reserved.