Class SelectorUtils


  • public final class SelectorUtils
    extends Object

    This is a utility class used by selectors and DirectoryScanner. The functionality more properly belongs just to selectors, but unfortunately DirectoryScanner exposed these as protected methods. Thus we have to support any subclasses of DirectoryScanner that may access these methods.

    This is a Singleton.

    Since:
    1.5
    Author:
    Arnout J. Kuiper ajkuiper@wxs.nl, Magesh Umasankar, Bruce Atherton
    • Method Detail

      • getInstance

        public static SelectorUtils getInstance()
        Returns:
        Retrieves the manager of the Singleton.
      • matchPatternStart

        public static boolean matchPatternStart​(String pattern,
                                                String str)

        Tests whether or not a given path matches the start of a given pattern up to the first "**".

        This is not a general purpose test and should only be used if you can live with false positives. For example, pattern=**\a and str=b will yield true.

        Parameters:
        pattern - The pattern to match against. Must not be null.
        str - The path to match, as a String. Must not be null.
        Returns:
        whether or not a given path matches the start of a given pattern up to the first "**".
      • matchPatternStart

        public static boolean matchPatternStart​(String pattern,
                                                String str,
                                                boolean isCaseSensitive)

        Tests whether or not a given path matches the start of a given pattern up to the first "**".

        This is not a general purpose test and should only be used if you can live with false positives. For example, pattern=**\a and str=b will yield true.

        Parameters:
        pattern - The pattern to match against. Must not be null.
        str - The path to match, as a String. Must not be null.
        isCaseSensitive - Whether or not matching should be performed case sensitively.
        Returns:
        whether or not a given path matches the start of a given pattern up to the first "**".
      • matchPath

        public static boolean matchPath​(String pattern,
                                        String str)
        Tests whether or not a given path matches a given pattern.
        Parameters:
        pattern - The pattern to match against. Must not be null.
        str - The path to match, as a String. Must not be null.
        Returns:
        true if the pattern matches against the string, or false otherwise.
      • matchPath

        public static boolean matchPath​(String pattern,
                                        String str,
                                        boolean isCaseSensitive)
        Tests whether or not a given path matches a given pattern.
        Parameters:
        pattern - The pattern to match against. Must not be null.
        str - The path to match, as a String. Must not be null.
        isCaseSensitive - Whether or not matching should be performed case sensitively.
        Returns:
        true if the pattern matches against the string, or false otherwise.
      • matchPath

        public static boolean matchPath​(String pattern,
                                        String str,
                                        String separator,
                                        boolean isCaseSensitive)
      • match

        public static boolean match​(String pattern,
                                    String str)
        Tests whether or not a string matches against a pattern. The pattern may contain two special characters:
        '*' means zero or more characters
        '?' means one and only one character
        Parameters:
        pattern - The pattern to match against. Must not be null.
        str - The string which must be matched against the pattern. Must not be null.
        Returns:
        true if the string matches against the pattern, or false otherwise.
      • match

        public static boolean match​(String pattern,
                                    String str,
                                    boolean isCaseSensitive)
        Tests whether or not a string matches against a pattern. The pattern may contain two special characters:
        '*' means zero or more characters
        '?' means one and only one character
        Parameters:
        pattern - The pattern to match against. Must not be null.
        str - The string which must be matched against the pattern. Must not be null.
        isCaseSensitive - Whether or not matching should be performed case sensitively.
        Returns:
        true if the string matches against the pattern, or false otherwise.
      • match

        public static boolean match​(char[] patArr,
                                    char[] strArr,
                                    boolean isCaseSensitive)
      • isOutOfDate

        public static boolean isOutOfDate​(File src,
                                          File target,
                                          int granularity)
        Returns dependency information on these two files. If src has been modified later than target, it returns true. If target doesn't exist, it likewise returns true. Otherwise, target is newer than src and is not out of date, thus the method returns false. It also returns false if the src file doesn't even exist, since how could the target then be out of date.
        Parameters:
        src - the original file
        target - the file being compared against
        granularity - the amount in seconds of slack we will give in determining out of dateness
        Returns:
        whether the target is out of date
      • removeWhitespace

        public static String removeWhitespace​(String input)
        "Flattens" a string by removing all whitespace (space, tab, linefeed, carriage return, and formfeed). This uses StringTokenizer and the default set of tokens as documented in the single argument constructor.
        Parameters:
        input - a String to remove all whitespace.
        Returns:
        a String that has had all whitespace removed.