Module lettuce.core
Package io.lettuce.core.internal

Class LettuceStrings

java.lang.Object
io.lettuce.core.internal.LettuceStrings
public class LettuceStrings
extends Object
Helper for String checks. This class is part of the internal API and may change without further notice.
Since:
3.0
Author:
Mark Paluch

  • Method Details

    • isEmpty

      public static boolean isEmpty​(String cs)
      Checks if a String is empty or null.
      Parameters:
      cs - the char sequence
      Returns:
      true if empty
      Since:
      6.0.3
      See Also:
      String.isEmpty()

    • isEmpty

      public static boolean isEmpty​(CharSequence cs)
      Checks if a CharSequence has a length of 0 or null.
      Parameters:
      cs - the char sequence
      Returns:
      true if empty
      See Also:
      CharSequence.length()

    • isNotEmpty

      public static boolean isNotEmpty​(String cs)
      Checks if a String is not empty and not null.
      Parameters:
      cs - the char sequence
      Returns:
      true if not empty
      Since:
      6.0.3
      See Also:
      String.isEmpty()

    • isNotEmpty

      public static boolean isNotEmpty​(CharSequence cs)
      Checks if a CharSequence has a non-zero length and is not null.
      Parameters:
      cs - the char sequence
      Returns:
      true if not empty
      See Also:
      CharSequence.length()

    • string

      public static String string​(double n)
      Convert double to String. If n is infinite, returns positive/negative infinity +inf and -inf.
      Parameters:
      n - the double.
      Returns:
      string representation of n

    • toDouble

      public static double toDouble​(String s)
      Convert String to double. If s is +inf/-inf, returns positive/negative infinity. If s is +nan/-nan, returns NaN.
      Parameters:
      s - string representation of the number
      Returns:
      the double value.
      Since:
      4.3.3

    • arrayToDelimitedString

      public static String arrayToDelimitedString​(Object[] arr, String delim)
      Convert a String array into a delimited String (e.g. CSV).

      Useful for toString() implementations.

      Parameters:
      arr - the array to display
      delim - the delimiter to use (typically a ",")
      Returns:
      the delimited String

    • collectionToDelimitedString

      public static String collectionToDelimitedString​(Collection<?> coll, String delim, String prefix, String suffix)
      Convert a Collection to a delimited String (e.g. CSV).

      Useful for toString() implementations.

      Parameters:
      coll - the Collection to convert
      delim - the delimiter to use (typically a ",")
      prefix - the String to start each element with
      suffix - the String to end each element with
      Returns:
      the delimited String