Class StringUtils

java.lang.Object
org.datanucleus.util.StringUtils
public class StringUtils extends Object
Utilities for String manipulation.

  • Constructor Details

    • StringUtils

      public StringUtils()

  • Method Details

    • getMessageFromRootCauseOfThrowable

      public static String getMessageFromRootCauseOfThrowable(Throwable thr)
      Convenience method to take a throwable and navigate up to the root cause and return the message of the root cause.
      Parameters:
      thr - The Throwable
      Returns:
      The message from the root cause

    • getStringFromStackTrace

      public static String getStringFromStackTrace(Throwable ex)
      Convert an exception to a String with full stack trace
      Parameters:
      ex - the exception
      Returns:
      a String with the full stacktrace error text

    • getFileForFilename

      public static File getFileForFilename(String filename)
      Convenience method to get a File for the specified filename. Caters for URL-encoded characters in the filename (treatment of spaces on Windows etc)
      Parameters:
      filename - Name of file
      Returns:
      The File

    • getJarFileForFilename

      public static JarFile getJarFileForFilename(String filename) throws IOException
      Convenience method to get a JarFile for the specified filename. Caters for URL-encoded characters in the filename (treatment of spaces on Windows etc)
      Parameters:
      filename - Name of file
      Returns:
      The JarFile
      Throws:
      IOException - if there is a problem opening the JarFile

    • getDecodedStringFromURLString

      public static String getDecodedStringFromURLString(String urlString)
      Convenience method to decode a URL string for use (so spaces are allowed)
      Parameters:
      urlString - The URL string
      Returns:
      The string

    • getEncodedURLStringFromString

      public static String getEncodedURLStringFromString(String string)
      Convenience method to encode a URL string for use (so spaces are allowed)
      Parameters:
      string - The string
      Returns:
      The encoded string

    • replaceAll

      public static String replaceAll(String theString, String toReplace, String replacement)
      A more efficient version than String.replace(CharSequence, CharSequence) which uses Regex for the implementation and requires compilation for every execution.
      Parameters:
      theString - The string to use
      toReplace - The string to replace.
      replacement - The replacement string.
      Returns:
      The updated string after replacing.

    • isWhitespace

      public static boolean isWhitespace(String str)
      Utility to check if a string is whitespace. If the string is null, returns true also.
      Parameters:
      str - The string to check
      Returns:
      Whether the string is just whitespace

    • areStringsEqual

      public static boolean areStringsEqual(String str1, String str2)
      Utility to tell if two strings are the same. Extends the basic String 'equals' method by allowing for nulls.
      Parameters:
      str1 - The first string
      str2 - The second string
      Returns:
      Whether the strings are equal.

    • leftAlignedPaddedString

      public static String leftAlignedPaddedString(String input, int length)
      Utility to return a left-aligned version of a string padded to the number of characters specified.
      Parameters:
      input - The input string
      length - The length desired
      Returns:
      The updated string

    • rightAlignedPaddedString

      public static String rightAlignedPaddedString(String input, int length)
      Utility to return a right-aligned version of a string padded to the number of characters specified.
      Parameters:
      input - The input string
      length - The length desired
      Returns:
      The updated string

    • split

      public static String[] split(String valuesString, String token)
      Splits a list of values separated by a token
      Parameters:
      valuesString - the text to be splited
      token - the token
      Returns:
      an array with all values

    • convertCommaSeparatedStringToSet

      public static Set<String> convertCommaSeparatedStringToSet(String str)
      Converts the input comma-separated string into a Set of the individual strings, with each string trimmed and converted to UPPERCASE.
      Parameters:
      str - The input string
      Returns:
      Set of the comma-separated strings that it is comprised of

    • toJVMIDString

      public static String toJVMIDString(Object obj)
      Utility to convert an object to a JVM type string. Returns the same as would have been output from Object.toString() if the class hadn't overridden it.
      Parameters:
      obj - The object
      Returns:
      The String version

    • booleanArrayToString

      public static String booleanArrayToString(boolean[] ba)
      Utility to convert a boolean[] to a String.
      Parameters:
      ba - The boolean[]
      Returns:
      String version

    • intArrayToString

      public static String intArrayToString(int[] ia)
      Utility to convert an int[] to a String.
      Parameters:
      ia - The int[]
      Returns:
      String version

    • objectArrayToString

      public static String objectArrayToString(Object[] arr)
      Utility to convert an Object[] to a String.
      Parameters:
      arr - The Object[]
      Returns:
      String version

    • collectionToString

      public static String collectionToString(Collection coll)
      Converts the given collection of objects to string as a comma-separated list. If the list is empty the string "<none>" is returned.
      Parameters:
      coll - collection of objects to be converted
      Returns:
      A string containing each object in the given collection, converted toString() and separated by commas.

    • getNameOfClass

      public static String getNameOfClass(Class cls)

    • mapToString

      public static String mapToString(Map map)
      Converts the given map of objects to string as a comma-separated list. If the map is empty the string "<none>" is returned.
      Parameters:
      map - Map to be converted
      Returns:
      A string containing each object in the given map, converted toString() and separated by commas.

    • isEmpty

      public static boolean isEmpty(String s)
      check string is null or length is 0.
      Parameters:
      s - check string
      Returns:
      return true if string is null or length is 0. return false other case.

    • notEmpty

      public static boolean notEmpty(String s)
      check string is not null and length > 0.
      Parameters:
      s - check string
      Returns:
      return true if string isnot null and length greater than 0. return false other case.

    • exponentialFormatBigDecimal

      public static String exponentialFormatBigDecimal(BigDecimal bd)
      Formats the given BigDecimal value into a floating-point literal (like we find in SQL). BigDecimal.toString() is not well suited to this purpose because it never uses E-notation, which causes some values with large exponents to be output as long strings with tons of zeroes in them.
      Parameters:
      bd - The number to format.
      Returns:
      The formatted String.

    • removeSpecialTagsFromString

      public static String removeSpecialTagsFromString(String str)
      Method to return the input string with all special tags (end-of-line, tab, etc) replaced by spaces.
      Parameters:
      str - The string
      Returns:
      The cleaned up string

    • getStringFromException

      public static String getStringFromException(Throwable exception)
      Gets a String message from an Exception. This method transforms nested exceptions into printable messages.
      Parameters:
      exception - to be read and transformed into a message to print
      Returns:
      the message to output