org.apache.logging.log4j.util

Class Strings

    • Method Detail

      • dquote

        public static String dquote(String str)
        Returns a double quoted string.
        Parameters:
        str - a String
        Returns:
        "str"

      • isBlank

        public static boolean isBlank(String s)
        Checks if a String is blank. A blank string is one that is null, empty, or when trimmed using String.trim() is empty.
        Parameters:
        s - the String to check, may be null
        Returns:
        true if the String is null, empty, or trims to empty.

      • isEmpty

        public static boolean isEmpty(CharSequence cs)

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

         Strings.isEmpty(null)      = true
 Strings.isEmpty("")        = true
 Strings.isEmpty(" ")       = false
 Strings.isEmpty("bob")     = false
 Strings.isEmpty("  bob  ") = false

        NOTE: This method changed in Lang version 2.0. It no longer trims the CharSequence. That functionality is available in isBlank().

        Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isEmpty(CharSequence)

        Parameters:
        cs - the CharSequence to check, may be null
        Returns:
        true if the CharSequence is empty or null

      • isNotBlank

        public static boolean isNotBlank(String s)
        Checks if a String is not blank. The opposite of isBlank(String).
        Parameters:
        s - the String to check, may be null
        Returns:
        true if the String is non- null and has content after being trimmed.

      • isNotEmpty

        public static boolean isNotEmpty(CharSequence cs)

        Checks if a CharSequence is not empty ("") and not null. 

         Strings.isNotEmpty(null)      = false
 Strings.isNotEmpty("")        = false
 Strings.isNotEmpty(" ")       = true
 Strings.isNotEmpty("bob")     = true
 Strings.isNotEmpty("  bob  ") = true

        Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.isNotEmpty(CharSequence)

        Parameters:
        cs - the CharSequence to check, may be null
        Returns:
        true if the CharSequence is not empty and not null

      • quote

        public static String quote(String str)
        Returns a quoted string.
        Parameters:
        str - a String
        Returns:
        'str'

      • trimToNull

        public static String trimToNull(String str)

        Removes control characters (char <= 32) from both ends of this String returning null if the String is empty ("") after the trim or if it is null.

        The String is trimmed using String.trim(). Trim removes start and end characters <= 32. 

         Strings.trimToNull(null)          = null
 Strings.trimToNull("")            = null
 Strings.trimToNull("     ")       = null
 Strings.trimToNull("abc")         = "abc"
 Strings.trimToNull("    abc    ") = "abc"

        Copied from Apache Commons Lang org.apache.commons.lang3.StringUtils.trimToNull(String)

        Parameters:
        str - the String to be trimmed, may be null
        Returns:
        the trimmed String, null if only chars <= 32, empty or null String input