Package org.apache.commons.io.filefilter

This package defines an interface (IOFileFilter) that combines both FileFilter and FilenameFilter.

See: Description

Package org.apache.commons.io.filefilter Description

This package defines an interface (IOFileFilter) that combines both FileFilter and FilenameFilter. Besidesthat the package offers a series of ready-to-use implementations of theIOFileFilter interface including implementation that allow you to combineother such filters.

These filter can be used to list files or in FileDialog, for example.

There are a number of 'primitive' filters:

DirectoryFilter Only accept directories
PrefixFileFilter Filter based on a prefix
SuffixFileFilter Filter based on a suffix
NameFileFilter Filter based on a filename
WildcardFileFilter Filter based on wildcards
AgeFileFilter Filter based on last modified time of file
SizeFileFilter Filter based on file size

And there are five 'boolean' filters:

TrueFileFilter Accept all files
FalseFileFilter Accept no files
NotFileFilter Applies a logical NOT to an existing filter
AndFileFilter Combines two filters using a logical AND
OrFileFilter Combines two filter using a logical OR

These boolean FilenameFilters can be nested, to allow arbitrary expressions.For example, here is how one could print all non-directory files in thecurrent directory, starting with "A", and ending in ".java" or ".class":

  File dir = new File(".");  String[] files = dir.list(     new AndFileFilter(      new AndFileFilter(        new PrefixFileFilter("A"),        new OrFileFilter(          new SuffixFileFilter(".class"),          new SuffixFileFilter(".java")        )      ),      new NotFileFilter(        new DirectoryFileFilter()      )    )  );  for ( int i=0; i<files.length; i++ ) {    System.out.println(files[i]);  }

This package also contains a utility class: FileFilterUtils. It allows you to use all file filters without having to put them in the import section. Here's how the above example will look using FileFilterUtils:

  File dir = new File(".");  String[] files = dir.list(     FileFilterUtils.andFileFilter(      FileFilterUtils.andFileFilter(        FileFilterUtils.prefixFileFilter("A"),        FileFilterUtils.orFileFilter(          FileFilterUtils.suffixFileFilter(".class"),          FileFilterUtils.suffixFileFilter(".java")        )      ),      FileFilterUtils.notFileFilter(        FileFilterUtils.directoryFileFilter()      )    )  );  for ( int i=0; i<files.length; i++ ) {    System.out.println(files[i]);  }

There are a few other goodies in that class so please have a look at the documentation in detail.

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