org.apache.commons.io.filefilter

Class FileFilterUtils


  • public class FileFilterUtils
    extends Object
    Useful utilities for working with file filters. It provides access to all file filter implementations in this package so you don't have to import every class you use.
    Since:
    1.0
    • Constructor Detail

      • FileFilterUtils

        public FileFilterUtils()
        FileFilterUtils is not normally instantiated.
    • Method Detail

      • ageFileFilter

        public static IOFileFilter ageFileFilter(Date cutoffDate)
        Returns a filter that returns true if the file was last modified before or at the specified cutoff date.
        Parameters:
        cutoffDate - the time threshold
        Returns:
        an appropriately configured age file filter
        Since:
        1.2
        See Also:
        AgeFileFilter
      • ageFileFilter

        public static IOFileFilter ageFileFilter(Date cutoffDate,
                                                 boolean acceptOlder)
        Returns a filter that filters files based on a cutoff date.
        Parameters:
        cutoffDate - the time threshold
        acceptOlder - if true, older files get accepted, if false, newer
        Returns:
        an appropriately configured age file filter
        Since:
        1.2
        See Also:
        AgeFileFilter
      • ageFileFilter

        public static IOFileFilter ageFileFilter(File cutoffReference)
        Returns a filter that returns true if the file was last modified before or at the same time as the specified reference file.
        Parameters:
        cutoffReference - the file whose last modification time is used as the threshold age of the files
        Returns:
        an appropriately configured age file filter
        Since:
        1.2
        See Also:
        AgeFileFilter
      • ageFileFilter

        public static IOFileFilter ageFileFilter(File cutoffReference,
                                                 boolean acceptOlder)
        Returns a filter that filters files based on a cutoff reference file.
        Parameters:
        cutoffReference - the file whose last modification time is used as the threshold age of the files
        acceptOlder - if true, older files get accepted, if false, newer
        Returns:
        an appropriately configured age file filter
        Since:
        1.2
        See Also:
        AgeFileFilter
      • ageFileFilter

        public static IOFileFilter ageFileFilter(long cutoff)
        Returns a filter that returns true if the file was last modified before or at the specified cutoff time.
        Parameters:
        cutoff - the time threshold
        Returns:
        an appropriately configured age file filter
        Since:
        1.2
        See Also:
        AgeFileFilter
      • ageFileFilter

        public static IOFileFilter ageFileFilter(long cutoff,
                                                 boolean acceptOlder)
        Returns a filter that filters files based on a cutoff time.
        Parameters:
        cutoff - the time threshold
        acceptOlder - if true, older files get accepted, if false, newer
        Returns:
        an appropriately configured age file filter
        Since:
        1.2
        See Also:
        AgeFileFilter
      • and

        public static IOFileFilter and(IOFileFilter... filters)
        Returns a filter that ANDs the specified filters.
        Parameters:
        filters - the IOFileFilters that will be ANDed together.
        Returns:
        a filter that ANDs the specified filters
        Throws:
        IllegalArgumentException - if the filters are null or contain a null value.
        Since:
        2.0
        See Also:
        AndFileFilter
      • asFileFilter

        public static IOFileFilter asFileFilter(FileFilter filter)
        Returns an IOFileFilter that wraps the FileFilter instance.
        Parameters:
        filter - the filter to be wrapped
        Returns:
        a new filter that implements IOFileFilter
        See Also:
        DelegateFileFilter
      • asFileFilter

        public static IOFileFilter asFileFilter(FilenameFilter filter)
        Returns an IOFileFilter that wraps the FilenameFilter instance.
        Parameters:
        filter - the filter to be wrapped
        Returns:
        a new filter that implements IOFileFilter
        See Also:
        DelegateFileFilter
      • directoryFileFilter

        public static IOFileFilter directoryFileFilter()
        Returns a filter that checks if the file is a directory.
        Returns:
        file filter that accepts only directories and not files
        See Also:
        DirectoryFileFilter.DIRECTORY
      • fileFileFilter

        public static IOFileFilter fileFileFilter()
        Returns a filter that checks if the file is a file (and not a directory).
        Returns:
        file filter that accepts only files and not directories
        See Also:
        FileFileFilter.INSTANCE
      • filter

        public static File[] filter(IOFileFilter filter,
                                    File... files)

        Applies an IOFileFilter to the provided File objects. The resulting array is a subset of the original file list that matches the provided filter.

         Set<File> allFiles = ...
         Set<File> javaFiles = FileFilterUtils.filterSet(allFiles,
             FileFilterUtils.suffixFileFilter(".java"));
         
        Parameters:
        filter - the filter to apply to the set of files.
        files - the array of files to apply the filter to.
        Returns:
        a subset of files that is accepted by the file filter.
        Throws:
        IllegalArgumentException - if the filter is null or files contains a null value.
        Since:
        2.0
      • filter

        public static File[] filter(IOFileFilter filter,
                                    Iterable<File> files)

        Applies an IOFileFilter to the provided File objects. The resulting array is a subset of the original file list that matches the provided filter.

        The Set returned by this method is not guaranteed to be thread safe.

         Set<File> allFiles = ...
         Set<File> javaFiles = FileFilterUtils.filterSet(allFiles,
             FileFilterUtils.suffixFileFilter(".java"));
         
        Parameters:
        filter - the filter to apply to the set of files.
        files - the array of files to apply the filter to.
        Returns:
        a subset of files that is accepted by the file filter.
        Throws:
        IllegalArgumentException - if the filter is null or files contains a null value.
        Since:
        2.0
      • filterList

        public static List<File> filterList(IOFileFilter filter,
                                            File... files)

        Applies an IOFileFilter to the provided File objects. The resulting list is a subset of the original files that matches the provided filter.

        The List returned by this method is not guaranteed to be thread safe.

         List<File> filesAndDirectories = ...
         List<File> directories = FileFilterUtils.filterList(filesAndDirectories,
             FileFilterUtils.directoryFileFilter());
         
        Parameters:
        filter - the filter to apply to each files in the list.
        files - the collection of files to apply the filter to.
        Returns:
        a subset of files that is accepted by the file filter.
        Throws:
        IllegalArgumentException - if the filter is null or files contains a null value.
        Since:
        2.0
      • filterList

        public static List<File> filterList(IOFileFilter filter,
                                            Iterable<File> files)

        Applies an IOFileFilter to the provided File objects. The resulting list is a subset of the original files that matches the provided filter.

        The List returned by this method is not guaranteed to be thread safe.

         List<File> filesAndDirectories = ...
         List<File> directories = FileFilterUtils.filterList(filesAndDirectories,
             FileFilterUtils.directoryFileFilter());
         
        Parameters:
        filter - the filter to apply to each files in the list.
        files - the collection of files to apply the filter to.
        Returns:
        a subset of files that is accepted by the file filter.
        Throws:
        IllegalArgumentException - if the filter is null
        Since:
        2.0
      • filterSet

        public static Set<File> filterSet(IOFileFilter filter,
                                          File... files)

        Applies an IOFileFilter to the provided File objects. The resulting set is a subset of the original file list that matches the provided filter.

        The Set returned by this method is not guaranteed to be thread safe.

         Set<File> allFiles = ...
         Set<File> javaFiles = FileFilterUtils.filterSet(allFiles,
             FileFilterUtils.suffixFileFilter(".java"));
         
        Parameters:
        filter - the filter to apply to the set of files.
        files - the collection of files to apply the filter to.
        Returns:
        a subset of files that is accepted by the file filter.
        Throws:
        IllegalArgumentException - if the filter is null or files contains a null value.
        Since:
        2.0
      • filterSet

        public static Set<File> filterSet(IOFileFilter filter,
                                          Iterable<File> files)

        Applies an IOFileFilter to the provided File objects. The resulting set is a subset of the original file list that matches the provided filter.

        The Set returned by this method is not guaranteed to be thread safe.

         Set<File> allFiles = ...
         Set<File> javaFiles = FileFilterUtils.filterSet(allFiles,
             FileFilterUtils.suffixFileFilter(".java"));
         
        Parameters:
        filter - the filter to apply to the set of files.
        files - the collection of files to apply the filter to.
        Returns:
        a subset of files that is accepted by the file filter.
        Throws:
        IllegalArgumentException - if the filter is null
        Since:
        2.0
      • magicNumberFileFilter

        public static IOFileFilter magicNumberFileFilter(byte[] magicNumber)
        Returns a filter that accepts files that begin with the provided magic number.
        Parameters:
        magicNumber - the magic number (byte sequence) to match at the beginning of each file.
        Returns:
        an IOFileFilter that accepts files beginning with the provided magic number.
        Throws:
        IllegalArgumentException - if magicNumber is null or is of length zero.
        Since:
        2.0
        See Also:
        MagicNumberFileFilter
      • magicNumberFileFilter

        public static IOFileFilter magicNumberFileFilter(byte[] magicNumber,
                                                         long offset)
        Returns a filter that accepts files that contains the provided magic number at a specified offset within the file.
        Parameters:
        magicNumber - the magic number (byte sequence) to match at the provided offset in each file.
        offset - the offset within the files to look for the magic number.
        Returns:
        an IOFileFilter that accepts files containing the magic number at the specified offset.
        Throws:
        IllegalArgumentException - if magicNumber is null, or contains no bytes, or offset is a negative number.
        Since:
        2.0
        See Also:
        MagicNumberFileFilter
      • magicNumberFileFilter

        public static IOFileFilter magicNumberFileFilter(String magicNumber)
        Returns a filter that accepts files that begin with the provided magic number.
        Parameters:
        magicNumber - the magic number (byte sequence) to match at the beginning of each file.
        Returns:
        an IOFileFilter that accepts files beginning with the provided magic number.
        Throws:
        IllegalArgumentException - if magicNumber is null or the empty String.
        Since:
        2.0
        See Also:
        MagicNumberFileFilter
      • magicNumberFileFilter

        public static IOFileFilter magicNumberFileFilter(String magicNumber,
                                                         long offset)
        Returns a filter that accepts files that contains the provided magic number at a specified offset within the file.
        Parameters:
        magicNumber - the magic number (byte sequence) to match at the provided offset in each file.
        offset - the offset within the files to look for the magic number.
        Returns:
        an IOFileFilter that accepts files containing the magic number at the specified offset.
        Throws:
        IllegalArgumentException - if magicNumber is null or the empty String, or if offset is a negative number.
        Since:
        2.0
        See Also:
        MagicNumberFileFilter
      • makeCVSAware

        public static IOFileFilter makeCVSAware(IOFileFilter filter)
        Decorates a filter to make it ignore CVS directories. Passing in null will return a filter that accepts everything except CVS directories.
        Parameters:
        filter - the filter to decorate, null means an unrestricted filter
        Returns:
        the decorated filter, never null
        Since:
        1.1 (method existed but had bug in 1.0)
      • makeDirectoryOnly

        public static IOFileFilter makeDirectoryOnly(IOFileFilter filter)
        Decorates a filter so that it only applies to directories and not to files.
        Parameters:
        filter - the filter to decorate, null means an unrestricted filter
        Returns:
        the decorated filter, never null
        Since:
        1.3
        See Also:
        DirectoryFileFilter.DIRECTORY
      • makeFileOnly

        public static IOFileFilter makeFileOnly(IOFileFilter filter)
        Decorates a filter so that it only applies to files and not to directories.
        Parameters:
        filter - the filter to decorate, null means an unrestricted filter
        Returns:
        the decorated filter, never null
        Since:
        1.3
        See Also:
        FileFileFilter.INSTANCE
      • makeSVNAware

        public static IOFileFilter makeSVNAware(IOFileFilter filter)
        Decorates a filter to make it ignore SVN directories. Passing in null will return a filter that accepts everything except SVN directories.
        Parameters:
        filter - the filter to decorate, null means an unrestricted filter
        Returns:
        the decorated filter, never null
        Since:
        1.1
      • nameFileFilter

        public static IOFileFilter nameFileFilter(String name)
        Returns a filter that returns true if the file name matches the specified text.
        Parameters:
        name - the file name
        Returns:
        a name checking filter
        See Also:
        NameFileFilter
      • nameFileFilter

        public static IOFileFilter nameFileFilter(String name,
                                                  IOCase caseSensitivity)
        Returns a filter that returns true if the file name matches the specified text.
        Parameters:
        name - the file name
        caseSensitivity - how to handle case sensitivity, null means case-sensitive
        Returns:
        a name checking filter
        Since:
        2.0
        See Also:
        NameFileFilter
      • notFileFilter

        public static IOFileFilter notFileFilter(IOFileFilter filter)
        Returns a filter that NOTs the specified filter.
        Parameters:
        filter - the filter to invert
        Returns:
        a filter that NOTs the specified filter
        See Also:
        NotFileFilter
      • or

        public static IOFileFilter or(IOFileFilter... filters)
        Returns a filter that ORs the specified filters.
        Parameters:
        filters - the IOFileFilters that will be ORed together.
        Returns:
        a filter that ORs the specified filters
        Throws:
        IllegalArgumentException - if the filters are null or contain a null value.
        Since:
        2.0
        See Also:
        OrFileFilter
      • prefixFileFilter

        public static IOFileFilter prefixFileFilter(String prefix)
        Returns a filter that returns true if the file name starts with the specified text.
        Parameters:
        prefix - the file name prefix
        Returns:
        a prefix checking filter
        See Also:
        PrefixFileFilter
      • prefixFileFilter

        public static IOFileFilter prefixFileFilter(String prefix,
                                                    IOCase caseSensitivity)
        Returns a filter that returns true if the file name starts with the specified text.
        Parameters:
        prefix - the file name prefix
        caseSensitivity - how to handle case sensitivity, null means case-sensitive
        Returns:
        a prefix checking filter
        Since:
        2.0
        See Also:
        PrefixFileFilter
      • sizeFileFilter

        public static IOFileFilter sizeFileFilter(long threshold)
        Returns a filter that returns true if the file is bigger than a certain size.
        Parameters:
        threshold - the file size threshold
        Returns:
        an appropriately configured SizeFileFilter
        Since:
        1.2
        See Also:
        SizeFileFilter
      • sizeFileFilter

        public static IOFileFilter sizeFileFilter(long threshold,
                                                  boolean acceptLarger)
        Returns a filter that filters based on file size.
        Parameters:
        threshold - the file size threshold
        acceptLarger - if true, larger files get accepted, if false, smaller
        Returns:
        an appropriately configured SizeFileFilter
        Since:
        1.2
        See Also:
        SizeFileFilter
      • sizeRangeFileFilter

        public static IOFileFilter sizeRangeFileFilter(long minSizeInclusive,
                                                       long maxSizeInclusive)
        Returns a filter that accepts files whose size is >= minimum size and <= maximum size.
        Parameters:
        minSizeInclusive - the minimum file size (inclusive)
        maxSizeInclusive - the maximum file size (inclusive)
        Returns:
        an appropriately configured IOFileFilter
        Since:
        1.3
        See Also:
        SizeFileFilter
      • suffixFileFilter

        public static IOFileFilter suffixFileFilter(String suffix)
        Returns a filter that returns true if the file name ends with the specified text.
        Parameters:
        suffix - the file name suffix
        Returns:
        a suffix checking filter
        See Also:
        SuffixFileFilter
      • suffixFileFilter

        public static IOFileFilter suffixFileFilter(String suffix,
                                                    IOCase caseSensitivity)
        Returns a filter that returns true if the file name ends with the specified text.
        Parameters:
        suffix - the file name suffix
        caseSensitivity - how to handle case sensitivity, null means case-sensitive
        Returns:
        a suffix checking filter
        Since:
        2.0
        See Also:
        SuffixFileFilter
      • toList

        public static List<IOFileFilter> toList(IOFileFilter... filters)
        Create a List of file filters.
        Parameters:
        filters - The file filters
        Returns:
        The list of file filters
        Throws:
        IllegalArgumentException - if the filters are null or contain a null value.
        Since:
        2.0
      • trueFileFilter

        public static IOFileFilter trueFileFilter()
        Returns a filter that always returns true.
        Returns:
        a true filter
        See Also:
        TrueFileFilter.TRUE

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