Package org.apache.nutch.util

Class StringUtil

java.lang.Object
org.apache.nutch.util.StringUtil
public class StringUtil extends Object
A collection of String processing utility methods.

  • Constructor Summary

    Constructors
    Constructor
    Description
    StringUtil()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static String
    cleanField(String value)
    Simple character substitution which cleans/removes all � chars from a given String.
    static byte[]
    fromHexString(String text)
    Convert a String containing consecutive (no inside whitespace) hexadecimal digits into a corresponding byte array.
    static boolean
    isEmpty(String str)
    Checks if a string is empty (ie is null or empty).
    static String
    leftPad(String s, int length)
    Returns a copy of s (left padded) with leading spaces so that it's length is length.
    static void
    main(String[] args)
     
    static String
    mask(String str)
    Mask sensitive strings - passwords, etc.
    static String
    mask(String str, char mask)
    Mask sensitive strings - passwords, etc.
    static String
    mask(String str, Pattern pattern, char mask)
    Mask sensitive strings - passwords, etc.
    static String
    rightPad(String s, int length)
    Returns a copy of s (right padded) with trailing spaces so that it's length is length.
    static String
    toHexString(byte[] buf)
    Convenience call for toHexString(byte[], String, int), where sep = null; lineLen = Integer.MAX_VALUE.
    static String
    toHexString(byte[] buf, String sep, int lineLen)
    Get a text representation of a byte[] as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • StringUtil

      public StringUtil()

  • Method Details

    • rightPad

      public static String rightPad(String s, int length)
      Returns a copy of s (right padded) with trailing spaces so that it's length is length. Strings already length characters long or longer are not altered.
      Parameters:
      s - input string to be copied and processed
      length - desired final length of padded string
      Returns:
      the resulting padded string

    • leftPad

      public static String leftPad(String s, int length)
      Returns a copy of s (left padded) with leading spaces so that it's length is length. Strings already length characters long or longer are not altered.
      Parameters:
      s - input string to be copied and processed
      length - desired final length of padded string
      Returns:
      the resulting padded string

    • toHexString

      public static String toHexString(byte[] buf)
      Convenience call for toHexString(byte[], String, int), where sep = null; lineLen = Integer.MAX_VALUE.
      Parameters:
      buf - input data for which to generate a hex string
      Returns:
      the hex string

    • toHexString

      public static String toHexString(byte[] buf, String sep, int lineLen)
      Get a text representation of a byte[] as hexadecimal String, where each pair of hexadecimal digits corresponds to consecutive bytes in the array.
      Parameters:
      buf - input data for which to generate a hex string
      sep - separate every pair of hexadecimal digits with this separator, or null if no separation is needed.
      lineLen - break the output String into lines containing output for lineLen bytes.
      Returns:
      the hex string

    • fromHexString

      public static byte[] fromHexString(String text)
      Convert a String containing consecutive (no inside whitespace) hexadecimal digits into a corresponding byte array. If the number of digits is not even, a '0' will be appended in the front of the String prior to conversion. Leading and trailing whitespace is ignored.
      Parameters:
      text - input text
      Returns:
      converted byte array, or null if unable to convert

    • isEmpty

      public static boolean isEmpty(String str)
      Checks if a string is empty (ie is null or empty).
      Parameters:
      str - the String to check for being empty or null
      Returns:
      true if empty or null, false otherwise

    • cleanField

      public static String cleanField(String value)
      Simple character substitution which cleans/removes all � chars from a given String.
      Parameters:
      value - the String to clean
      Returns:
      substituted cleaned string

    • mask

      public static String mask(String str)
      Mask sensitive strings - passwords, etc.
      Parameters:
      str - input string
      Returns:
      the masked string, all characters replaced by *

    • mask

      public static String mask(String str, char mask)
      Mask sensitive strings - passwords, etc.
      Parameters:
      str - input string
      mask - char used for masking
      Returns:
      the masked string, all characters replaced by the mask character

    • mask

      public static String mask(String str, Pattern pattern, char mask)
      Mask sensitive strings - passwords, etc.
      Parameters:
      str - input string
      pattern - pattern which defines capturing groups to be masked in input
      mask - char used for masking
      Returns:
      the masked string, all characters matched in capturing groups of the pattern replaced by the mask character

    • main

      public static void main(String[] args)