Package org.apache.commons.io.filefilter

Class RegexFileFilter

  • All Implemented Interfaces:
    java.io.FileFilter, java.io.FilenameFilter, java.io.Serializable, java.nio.file.FileVisitor<java.nio.file.Path>, PathFilter, PathVisitor, IOFileFilter
    public class RegexFileFilter
extends AbstractFileFilter
implements java.io.Serializable
    Filters files using supplied regular expression(s).

    See java.util.regex.Pattern for regex matching rules.

    Using Classic IO

    e.g. 

     File dir = new File(".");
 FileFilter fileFilter = new RegexFileFilter("^.*[tT]est(-\\d+)?\\.java$");
 File[] files = dir.listFiles(fileFilter);
 for (String file : files) {
     System.out.println(file);
 }

    Using NIO

     final Path dir = Paths.get("");
 final AccumulatorPathVisitor visitor = AccumulatorPathVisitor.withLongCounters(new RegexFileFilter("^.*[tT]est(-\\d+)?\\.java$"));
 //
 // Walk one dir
 Files.walkFileTree(dir, Collections.emptySet(), 1, visitor);
 System.out.println(visitor.getPathCounters());
 System.out.println(visitor.getFileList());
 //
 visitor.getPathCounters().reset();
 //
 // Walk dir tree
 Files.walkFileTree(dir, visitor);
 System.out.println(visitor.getPathCounters());
 System.out.println(visitor.getDirList());
 System.out.println(visitor.getFileList());
    Since:
    1.4
    See Also:
    Serialized Form

    • Constructor Summary

      Constructors 
      Constructor Description
      RegexFileFilter​(java.lang.String pattern)
      Constructs a new regular expression filter.
      RegexFileFilter​(java.lang.String pattern, int flags)
      Constructs a new regular expression filter with the specified flags.
      RegexFileFilter​(java.lang.String pattern, IOCase caseSensitivity)
      Constructs a new regular expression filter with the specified flags case sensitivity.
      RegexFileFilter​(java.util.regex.Pattern pattern)
      Constructs a new regular expression filter for a compiled regular expression
      RegexFileFilter​(java.util.regex.Pattern pattern, java.util.function.Function<java.nio.file.Path,​java.lang.String> pathToString)
      Constructs a new regular expression filter for a compiled regular expression

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean accept​(java.io.File dir, java.lang.String name)
      Checks to see if the file name matches one of the regular expressions.
      java.nio.file.FileVisitResult accept​(java.nio.file.Path path, java.nio.file.attribute.BasicFileAttributes attributes)
      Checks to see if the file name matches one of the regular expressions.
      java.lang.String toString()
      Returns a debug string.

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • RegexFileFilter

        public RegexFileFilter​(java.util.regex.Pattern pattern)
        Constructs a new regular expression filter for a compiled regular expression
        Parameters:
        pattern - regular expression to match.
        Throws:
        java.lang.IllegalArgumentException - if the pattern is null.

      • RegexFileFilter

        public RegexFileFilter​(java.util.regex.Pattern pattern,
                       java.util.function.Function<java.nio.file.Path,​java.lang.String> pathToString)
        Constructs a new regular expression filter for a compiled regular expression
        Parameters:
        pattern - regular expression to match.
        pathToString - How convert a path to a string.
        Throws:
        java.lang.IllegalArgumentException - if the pattern is null.
        Since:
        2.10.0

      • RegexFileFilter

        public RegexFileFilter​(java.lang.String pattern)
        Constructs a new regular expression filter.
        Parameters:
        pattern - regular string expression to match
        Throws:
        java.lang.IllegalArgumentException - if the pattern is null

      • RegexFileFilter

        public RegexFileFilter​(java.lang.String pattern,
                       int flags)
        Constructs a new regular expression filter with the specified flags.
        Parameters:
        pattern - regular string expression to match
        flags - pattern flags - e.g. Pattern.CASE_INSENSITIVE
        Throws:
        java.lang.IllegalArgumentException - if the pattern is null

      • RegexFileFilter

        public RegexFileFilter​(java.lang.String pattern,
                       IOCase caseSensitivity)
        Constructs a new regular expression filter with the specified flags case sensitivity.
        Parameters:
        pattern - regular string expression to match
        caseSensitivity - how to handle case sensitivity, null means case-sensitive
        Throws:
        java.lang.IllegalArgumentException - if the pattern is null

    • Method Detail

      • accept

        public boolean accept​(java.io.File dir,
                      java.lang.String name)
        Checks to see if the file name matches one of the regular expressions.
        Specified by:
        accept in interface java.io.FilenameFilter
        Specified by:
        accept in interface IOFileFilter
        Overrides:
        accept in class AbstractFileFilter
        Parameters:
        dir - the file directory (ignored)
        name - the file name
        Returns:
        true if the file name matches one of the regular expressions

      • accept

        public java.nio.file.FileVisitResult accept​(java.nio.file.Path path,
                                            java.nio.file.attribute.BasicFileAttributes attributes)
        Checks to see if the file name matches one of the regular expressions.
        Specified by:
        accept in interface IOFileFilter
        Specified by:
        accept in interface PathFilter
        Parameters:
        path - the path
        attributes - the path attributes
        Returns:
        true if the file name matches one of the regular expressions

      • toString

        public java.lang.String toString()
        Returns a debug string.
        Overrides:
        toString in class AbstractFileFilter
        Returns:
        a String representation
        Since:
        2.10.0