SizeFileComparator

java.lang.Object
- org.apache.commons.io.comparator.SizeFileComparator

All Implemented Interfaces:

Serializable, Comparator<File>
```
public class SizeFileComparator
extends Object
implements Serializable
```
Compare the length/size of two files for order (see File.length() and FileUtils.sizeOfDirectory(File)).
This comparator can be used to sort lists or arrays of files by their length/size.
Example of sorting a list of files using the SIZE_COMPARATOR singleton instance:
```
       List<File> list = ...
       ((AbstractFileComparator) SizeFileComparator.SIZE_COMPARATOR).sort(list);
 
```
Example of doing a reverse sort of an array of files using the SIZE_REVERSE singleton instance:
```
       File[] array = ...
       ((AbstractFileComparator) SizeFileComparator.SIZE_REVERSE).sort(array);
 
```
N.B. Directories are treated as zero size unless sumDirectoryContents is true.
Since:

1.4

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static Comparator<File>`	`SIZE_COMPARATOR` Size comparator instance - directories are treated as zero size
`static Comparator<File>`	`SIZE_REVERSE` Reverse size comparator instance - directories are treated as zero size
`static Comparator<File>`	`SIZE_SUMDIR_COMPARATOR` Size comparator instance which sums the size of a directory's contents using `FileUtils.sizeOfDirectory(File)`
`static Comparator<File>`	`SIZE_SUMDIR_REVERSE` Reverse size comparator instance which sums the size of a directory's contents using `FileUtils.sizeOfDirectory(File)`

Constructor Summary

Constructors
Constructor and Description
`SizeFileComparator()` Construct a file size comparator instance (directories treated as zero size).
`SizeFileComparator(boolean sumDirectoryContents)` Construct a file size comparator instance specifying whether the size of the directory contents should be aggregated.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`int`	`compare(File file1, File file2)` Compare the length of two files.
`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
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
  - SIZE_COMPARATOR
```
public static final Comparator<File> SIZE_COMPARATOR
```
    Size comparator instance - directories are treated as zero size
  - SIZE_REVERSE
```
public static final Comparator<File> SIZE_REVERSE
```
    Reverse size comparator instance - directories are treated as zero size
  - SIZE_SUMDIR_COMPARATOR
```
public static final Comparator<File> SIZE_SUMDIR_COMPARATOR
```
    Size comparator instance which sums the size of a directory's contents using FileUtils.sizeOfDirectory(File)
  - SIZE_SUMDIR_REVERSE
```
public static final Comparator<File> SIZE_SUMDIR_REVERSE
```
    Reverse size comparator instance which sums the size of a directory's contents using FileUtils.sizeOfDirectory(File)
- Constructor Detail
  - SizeFileComparator
```
public SizeFileComparator()
```
    Construct a file size comparator instance (directories treated as zero size).
  - SizeFileComparator
```
public SizeFileComparator(boolean sumDirectoryContents)
```
    Construct a file size comparator instance specifying whether the size of the directory contents should be aggregated.
    If the sumDirectoryContents is true The size of directories is calculated using FileUtils.sizeOfDirectory(File).
    
    Parameters:
    
    sumDirectoryContents - true if the sum of the directories' contents should be calculated, otherwise false if directories should be treated as size zero (see FileUtils.sizeOfDirectory(File)).
- Method Detail
  - compare
```
public int compare(File file1,
                   File file2)
```
    Compare the length of two files.
    
    Specified by:
    
    compare in interface Comparator<File>
    
    Parameters:
    
    file1 - The first file to compare
    
    file2 - The second file to compare
    
    Returns:
    
    a negative value if the first file's length is less than the second, zero if the lengths are the same and a positive value if the first files length is greater than the second file.
  - 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:
    
    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:
    
    2.0

Class SizeFileComparator

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Methods inherited from interface java.util.Comparator

Field Detail

SIZE_COMPARATOR

SIZE_REVERSE

SIZE_SUMDIR_COMPARATOR

SIZE_SUMDIR_REVERSE

Constructor Detail

SizeFileComparator

SizeFileComparator

Method Detail

compare

toString

sort

sort