Package org.apache.zookeeper.common

Class StringUtils

  • public class StringUtils
extends Object

    • Method Detail

      • split

        public static List<String> split​(String value,
                                 String separator)
        This method returns an immutable List<String>, but different from String's split() it trims the results in the input String, and removes any empty string from the resulting List.

      • joinStrings

        public static String joinStrings​(List<String> list,
                                 String delim)
        This method takes a List<String> and a delimiter and joins the strings into a single string, where the original strings are separated using the given delimiter. This method is a null-safe version of String.join(CharSequence, Iterable)

        Note that if an individual element is null, then "null" is added.

        Parameters:
        list - a List that will have its elements joined together
        delim - a sequence of characters that is used to separate each of the elements in the resulting String
        Returns:
        a new String that is composed from the elements argument or null if list is null
        Throws:
        NullPointerException - if delim is null

      • isBlank

        public static boolean isBlank​(String s)
        Returns true if the string is null or it does not contain any non space characters.
        Parameters:
        s - the string
        Returns:
        true if the string is null or it does not contain any non space characters.

      • isEmpty

        public static boolean isEmpty​(String str)

        Checks if a String is empty ("") or null.

         StringUtils.isEmpty(null)      = true
 StringUtils.isEmpty("")        = true
 StringUtils.isEmpty(" ")       = false
 StringUtils.isEmpty("bob")     = false
 StringUtils.isEmpty("  bob  ") = false
        Parameters:
        str - the String to check, may be null
        Returns:
        true if the String is empty or null