Class FormUtils

java.lang.Object
com.jgoodies.forms.util.FormUtils

public final class FormUtils extends Object
A library-internal class that consists only of static utility methods. Note: This class is not part of the public Forms API. It's intended for library implementation purposes only. The class's API may change at any time.
Since:
1.2
Version:
$Revision: 1.11 $
Author:
Karsten Lentzsch
  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    assertNotBlank(String text, String description)
    Throws an exception if the specified text is blank using the given text description.
    static void
    assertNotNull(Object object, String description)
    Throws an NPE if the given object is null that uses the specified text to describe the object.
    static void
    Clears cached internal Forms state that is based on the Look&Feel, for example dialog base units.
    static boolean
    equals(Object o1, Object o2)
    Checks and answers if the two objects are both null or equal.
    static boolean
    Checks and answers if the given string is whitespace, empty (""), or null.
    static boolean
    Lazily checks and answers whether the Aqua look&feel is active.
    static boolean
    Checks and answers if the given string is not empty (""), not null and not whitespace only.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Method Details

    • assertNotBlank

      public static void assertNotBlank(String text, String description)
      Throws an exception if the specified text is blank using the given text description.
      Parameters:
      text - the text to check
      description - describes the text, used in the exception message
      Throws:
      NullPointerException - if text is null
      IllegalArgumentException - if text is empty, or blank
    • assertNotNull

      public static void assertNotNull(Object object, String description)
      Throws an NPE if the given object is null that uses the specified text to describe the object.
      Parameters:
      object - the text to check
      description - describes the object, used in the exception message
      Throws:
      NullPointerException - if object is null
    • equals

      public static boolean equals(Object o1, Object o2)
      Checks and answers if the two objects are both null or equal.
       #equals(null, null)  == true
       #equals("Hi", "Hi")  == true
       #equals("Hi", null)  == false
       #equals(null, "Hi")  == false
       #equals("Hi", "Ho")  == false
       
      Parameters:
      o1 - the first object to compare
      o2 - the second object to compare
      Returns:
      boolean true if and only if both objects are null or equal
    • isBlank

      public static boolean isBlank(String str)
      Checks and answers if the given string is whitespace, empty (""), or null.
       FormUtils.isBlank(null)    == true
       FormUtils.isBlank("")      == true
       FormUtils.isBlank(" ")     == true
       FormUtils.isBlank(" abc")  == false
       FormUtils.isBlank("abc ")  == false
       FormUtils.isBlank(" abc ") == false
       
      Parameters:
      str - the string to check, may benull
      Returns:
      true if the string is whitespace, empty, or null
    • isNotBlank

      public static boolean isNotBlank(String str)
      Checks and answers if the given string is not empty (""), not null and not whitespace only.
       FormUtils.isNotBlank(null)    == false
       FormUtils.isNotBlank("")      == false
       FormUtils.isNotBlank(" ")     == false
       FormUtils.isNotBlank(" abc")  == true
       FormUtils.isNotBlank("abc ")  == true
       FormUtils.isNotBlank(" abc ") == true
       
      Parameters:
      str - the string to check, may be null
      Returns:
      true if the string is not empty and not null and not whitespace only
    • isLafAqua

      public static boolean isLafAqua()
      Lazily checks and answers whether the Aqua look&feel is active.
      Returns:
      true if the current look&feel is Aqua
    • clearLookAndFeelBasedCaches

      public static void clearLookAndFeelBasedCaches()
      Clears cached internal Forms state that is based on the Look&Feel, for example dialog base units.

      There's typically no need to call this method directly. It'll be invoked automatically, if the L&F has been changed via UIManager.setLookAndFeel(javax.swing.LookAndFeel) and cached data is requested. It's been made public to allow cache invalidation for cases where the L&F is changed temporarily by replacing the UIDefaults, for example in a visual editor.

      Since:
      1.2.1