This package defines an interface (IOFileFilter) that combines both {@link java.io.FileFilter} and {@link java.io.FilenameFilter}. Besides that the package offers a series of ready-to-use implementations of the IOFileFilter interface including implementation that allow you to combine other such filters.
These filter can be used to list files or in {@link java.awt.FileDialog}, for example.
| 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 |
| 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 the current 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.