Package org.apache.hc.core5.util

Class TextUtils

java.lang.Object
org.apache.hc.core5.util.TextUtils
public final class TextUtils extends Object
Tests and converts Strings and CharSequence.
Since:
4.3

  • Method Details

    • isEmpty

      public static boolean isEmpty(CharSequence s)
      Tests whether the parameter is null or of zero length.
      Parameters:
      s - The CharSequence to test.
      Returns:
      whether the parameter is null or of zero length.

    • isBlank

      public static boolean isBlank(CharSequence s)

      Checks if a CharSequence is empty (""), null or whitespace only.

      Whitespace is defined by Character.isWhitespace(char).

       TextUtils.isBlank(null)      = true
 TextUtils.isBlank("")        = true
 TextUtils.isBlank(" ")       = true
 TextUtils.isBlank("abg")     = false
 TextUtils.isBlank("  abg  ") = false
      Parameters:
      s - the CharSequence to check, may be null
      Returns:
      true if the CharSequence is null, empty or whitespace only

    • length

      public static int length(CharSequence cs)
      Gets a CharSequence length or 0 if the CharSequence is null.
      Parameters:
      cs - a CharSequence or null
      Returns:
      CharSequence length or 0 if the CharSequence is null.
      Since:
      5.1

    • containsBlanks

      public static boolean containsBlanks(CharSequence s)
      Tests whether a CharSequence contains any whitespace.
      Parameters:
      s - The CharSequence to test.
      Returns:
      whether a CharSequence contains any whitespace.
      Since:
      4.4

    • toHexString

      public static String toHexString(byte[] bytes)

    • toLowerCase

      public static String toLowerCase(String s)
      Converts a String to its lower case representation using Locale.ROOT.
      Parameters:
      s - The String to convert
      Returns:
      The converted String.
      Since:
      5.2

    • isAllASCII

      public static boolean isAllASCII(CharSequence s)
      Determines whether the given CharSequence contains only ASCII characters.
      Parameters:
      s - the CharSequence to check
      Returns:
      true if the CharSequence contains only ASCII characters, false otherwise
      Throws:
      IllegalArgumentException - if the input CharSequence is null
      Since:
      5.3

    • castAsByte

      @Internal public static byte castAsByte(int c)
      Casts character to byte filtering non-visible and non-ASCII characters before conversion.
      Parameters:
      c - The character to cast.
      Returns:
      The given character or '?'.
      Since:
      5.2

    • isHex

      public static boolean isHex(char c)
      Tests whether the given character is an ASCII hexadecimal digit.

      Accepts '0'..'9', 'A'..'F', and 'a'..'f' only. This method does not consider non-ASCII numerals or fullwidth forms.

      Parameters:
      c - the character to test
      Returns:
      true if c is an ASCII hex digit, false otherwise
      Since:
      5.4