Class Contract

java.lang.Object
org.jdesktop.swingx.util.Contract

public class Contract extends Object
Utility class for checking contracts.
  • Constructor Details

    • Contract

      private Contract()
  • Method Details

    • asNotNull

      public static <T> T asNotNull(T input, String message)
      Tests the input parameter against null. If the input is an array, checks all of its elements as well. Returns the unchanged parameter if not null, throws a NullPointerException otherwise.

      PENDING: type of exception? there are raging debates, some favour an IllegalArgument?

      PENDING: the implementation uses a unchecked type cast to an array. can we do better, how?

      Type Parameters:
      T - the type of the input parameter
      Parameters:
      input - the argument to check against null.
      message - the text of the exception if the argument is null
      Returns:
      the input if not null
      Throws:
      NullPointerException - if input is null