org.apache.commons.io.comparator

Class CompositeFileComparator

java.lang.Object

org.apache.commons.io.comparator.AbstractFileComparator

org.apache.commons.io.comparator.CompositeFileComparator

All Implemented Interfaces:

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

public class CompositeFileComparator
extends AbstractFileComparator
implements java.io.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:

2.0

Version:

$Id: CompositeFileComparator.java 1304052 2012-03-22 20:55:29Z ggregory $

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Comparator<java.io.File>[]	delegates
private static java.util.Comparator<?>[]	NO_COMPARATORS

Constructor Summary

Constructors

Constructor and Description
CompositeFileComparator(java.util.Comparator<java.io.File>... delegates) Create a composite comparator for the set of delegate comparators.
CompositeFileComparator(java.lang.Iterable<java.util.Comparator<java.io.File>> delegates) Create a composite comparator for the set of delegate comparators.

Method Summary

Methods

Modifier and Type	Method and Description
int	compare(java.io.File file1, java.io.File file2) Compare the two files using delegate comparators.
java.lang.String	toString() String representation of this file comparator.

Methods inherited from class org.apache.commons.io.comparator.AbstractFileComparator

sort, sort

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

Field Detail

NO_COMPARATORS

private static final java.util.Comparator<?>[] NO_COMPARATORS

delegates

private final java.util.Comparator<java.io.File>[] delegates

Constructor Detail

CompositeFileComparator

public CompositeFileComparator(java.util.Comparator<java.io.File>... delegates)

Create a composite comparator for the set of delegate comparators.

Parameters:

delegates - The delegate file comparators

CompositeFileComparator

public CompositeFileComparator(java.lang.Iterable<java.util.Comparator<java.io.File>> delegates)

Create a composite comparator for the set of delegate comparators.

Parameters:

delegates - The delegate file comparators

Method Detail

compare

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

Compare the two files using delegate comparators.

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 first non-zero result returned from the delegate comparators or zero.

toString

public java.lang.String toString()

String representation of this file comparator.

Overrides:

toString in class AbstractFileComparator

Returns:

String representation of this file comparator