org.apache.commons.io.comparator

Class DefaultFileComparator

java.lang.Object

org.apache.commons.io.comparator.DefaultFileComparator

All Implemented Interfaces:

java.io.Serializable, java.util.Comparator<java.io.File>

public class DefaultFileComparator
extends java.lang.Object
implements java.io.Serializable

Compare two files using the default File.compareTo(File) method.

This comparator can be used to sort lists or arrays of files by using the default file comparison.

Example of sorting a list of files using the DEFAULT_COMPARATOR singleton instance:

       List<File> list = ...
       ((AbstractFileComparator) DefaultFileComparator.DEFAULT_COMPARATOR).sort(list);
 

Example of doing a reverse sort of an array of files using the DEFAULT_REVERSE singleton instance:

       File[] array = ...
       ((AbstractFileComparator) DefaultFileComparator.DEFAULT_REVERSE).sort(array);
 

Since:

1.4

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static java.util.Comparator<java.io.File>	DEFAULT_COMPARATOR Singleton default comparator instance
static java.util.Comparator<java.io.File>	DEFAULT_REVERSE Singleton reverse default comparator instance

Constructor Summary

Constructors

Constructor and Description
DefaultFileComparator()

Method Summary

Modifier and Type	Method and Description
int	compare(java.io.File file1, java.io.File file2) Compare the two files using the File.compareTo(File) method.
java.io.File[]	sort(java.io.File... files) Sort an array of files.
java.util.List<java.io.File>	sort(java.util.List<java.io.File> files) Sort a List of files.
java.lang.String	toString() String representation of this file comparator.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Comparator

comparing, comparing, comparingDouble, comparingInt, comparingLong, equals, naturalOrder, nullsFirst, nullsLast, reversed, reverseOrder, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Field Detail

DEFAULT_COMPARATOR

public static final java.util.Comparator<java.io.File> DEFAULT_COMPARATOR

Singleton default comparator instance

DEFAULT_REVERSE

public static final java.util.Comparator<java.io.File> DEFAULT_REVERSE

Singleton reverse default comparator instance

Constructor Detail

DefaultFileComparator

public DefaultFileComparator()

Method Detail

compare

public int compare(java.io.File file1,
                   java.io.File file2)

Compare the two files using the File.compareTo(File) method.

Specified by:

compare in interface java.util.Comparator<java.io.File>

Parameters:

file1 - The first file to compare

file2 - The second file to compare

Returns:

the result of calling file1's File.compareTo(File) with file2 as the parameter.

sort

public java.io.File[] sort(java.io.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:

2.0

sort

public java.util.List<java.io.File> sort(java.util.List<java.io.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:

2.0

toString

public java.lang.String toString()

String representation of this file comparator.

Overrides:

toString in class java.lang.Object

Returns:

String representation of this file comparator