org.apache.commons.io.comparator

类 SizeFileComparator

java.lang.Object

org.apache.commons.io.comparator.SizeFileComparator

所有已实现的接口:

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.

从以下版本开始:

1.4

另请参阅:

序列化表格

字段概要

字段

限定符和类型	字段和说明
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)

构造器概要

构造器

构造器和说明
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.

方法概要

限定符和类型	方法和说明
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.

从类继承的方法 java.lang.Object

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

从接口继承的方法 java.util.Comparator

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

字段详细资料

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)

构造器详细资料

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).

参数:

sumDirectoryContents - true if the sum of the directoryies contents should be calculated, otherwise false if directories should be treated as size zero (see FileUtils.sizeOfDirectory(File)).

方法详细资料

compare

public int compare(File file1,
                   File file2)

Compare the length of two files.

指定者:

compare 在接口中 Comparator<File>

参数:

file1 - The first file to compare

file2 - The second file to compare

返回:

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.

返回:

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.

参数:

files - The files to sort, may be null

返回:

The sorted array

从以下版本开始:

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.

参数:

files - The files to sort, may be null

返回:

The sorted list

从以下版本开始:

2.0