Package com.github.tonyluo.excel.util

Class StringUtils

java.lang.Object
com.github.tonyluo.excel.util.StringUtils
public class StringUtils
extends java.lang.Object
copy from org.apache.commons.lang3.StringUtils

  • Field Summary

    Fields 
    Modifier and Type Field Description
    static java.lang.String EMPTY
    The empty String "".

  • Constructor Summary

    Constructors 
    Constructor Description
    StringUtils()  

  • Method Summary

    Modifier and Type Method Description
    static boolean isBlank​(java.lang.CharSequence cs)
    Checks if a CharSequence is empty (""), null or whitespace only.
    static boolean isEmpty​(java.lang.CharSequence cs)
    Checks if a CharSequence is empty ("") or null.
    static boolean isNotBlank​(java.lang.CharSequence cs)
    Checks if a CharSequence is not empty (""), not null and not whitespace only.
    static boolean isNotEmpty​(java.lang.CharSequence cs)
    Checks if a CharSequence is not empty ("") and not null.
    static java.lang.String trimToEmpty​(java.lang.String str)
    Removes control characters (char <= 32) from both ends of this String returning an empty String ("") if the String is empty ("") after the trim or if it is null.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Field Details

  • Constructor Details

  • Method Details

    • isEmpty

      public static boolean isEmpty​(java.lang.CharSequence cs)

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

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

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

      Parameters:
      cs - the CharSequence to check, may be null
      Returns:
      true if the CharSequence is empty or null
      Since:
      3.0 Changed signature from isEmpty(String) to isEmpty(CharSequence)

    • isNotEmpty

      public static boolean isNotEmpty​(java.lang.CharSequence cs)

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

       StringUtils.isNotEmpty(null)      = false
 StringUtils.isNotEmpty("")        = false
 StringUtils.isNotEmpty(" ")       = true
 StringUtils.isNotEmpty("bob")     = true
 StringUtils.isNotEmpty("  bob  ") = true
      Parameters:
      cs - the CharSequence to check, may be null
      Returns:
      true if the CharSequence is not empty and not null
      Since:
      3.0 Changed signature from isNotEmpty(String) to isNotEmpty(CharSequence)

    • isBlank

      public static boolean isBlank​(java.lang.CharSequence cs)

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

      Whitespace is defined by Character.isWhitespace(char).

       StringUtils.isBlank(null)      = true
 StringUtils.isBlank("")        = true
 StringUtils.isBlank(" ")       = true
 StringUtils.isBlank("bob")     = false
 StringUtils.isBlank("  bob  ") = false
      Parameters:
      cs - the CharSequence to check, may be null
      Returns:
      true if the CharSequence is null, empty or whitespace only
      Since:
      2.0, 3.0 Changed signature from isBlank(String) to isBlank(CharSequence)

    • isNotBlank

      public static boolean isNotBlank​(java.lang.CharSequence cs)

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

      Whitespace is defined by Character.isWhitespace(char).

       StringUtils.isNotBlank(null)      = false
 StringUtils.isNotBlank("")        = false
 StringUtils.isNotBlank(" ")       = false
 StringUtils.isNotBlank("bob")     = true
 StringUtils.isNotBlank("  bob  ") = true
      Parameters:
      cs - the CharSequence to check, may be null
      Returns:
      true if the CharSequence is not empty and not null and not whitespace only
      Since:
      2.0, 3.0 Changed signature from isNotBlank(String) to isNotBlank(CharSequence)

    • trimToEmpty

      public static java.lang.String trimToEmpty​(java.lang.String str)

      Removes control characters (char <= 32) from both ends of this String returning an empty String ("") 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. 

       StringUtils.trimToEmpty(null)          = ""
 StringUtils.trimToEmpty("")            = ""
 StringUtils.trimToEmpty("     ")       = ""
 StringUtils.trimToEmpty("abc")         = "abc"
 StringUtils.trimToEmpty("    abc    ") = "abc"
      Parameters:
      str - the String to be trimmed, may be null
      Returns:
      the trimmed String, or an empty String if null input
      Since:
      2.0