Package utility.function

Class Dummy

  • public class Dummy
extends java.lang.Object
    A utility class to help create dummy stub functional interfaces

    • Constructor Summary

      Constructors 
      Constructor Description
      Dummy()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static Callback callback()
      Creates a dummy callback
      static <T> java.util.function.Consumer<T> consumer()
      Creates a dummy consumer
      static <T,​R>
      java.util.function.Function<T,​R>      		 function()
      Creates a dummy function
      static java.lang.Runnable ifNull​(java.lang.Runnable r)
      Returns the given runnable object if it is not null.
      static <T> java.util.function.Consumer<T> ifNull​(java.util.function.Consumer<T> c)
      Returns the given consumer object if it is not null.
      static <T,​R>
      java.util.function.Function<T,​R>      		 ifNull​(java.util.function.Function<T,​R> f)
      Returns the given function object if it is not null.
      static <T> java.util.function.Supplier<T> ifNull​(java.util.function.Supplier<T> s)
      Returns the given callback object if it is not null.
      static Callback ifNull​(Callback c)
      Returns the given callback object if it is not null.
      static java.lang.Runnable runnable()
      Creates a dummy runnable
      static <T> java.util.function.Supplier<T> supplier()
      Creates a dummy supplier

      • Methods inherited from class java.lang.Object

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

    • Constructor Detail

      • Dummy

        public Dummy()

    • Method Detail

      • callback

        public static Callback callback()
        Creates a dummy callback
        Returns:
        a dummy callback

      • consumer

        public static <T> java.util.function.Consumer<T> consumer()
        Creates a dummy consumer
        Returns:
        a dummy consumer

      • function

        public static <T,​R> java.util.function.Function<T,​R> function()
        Creates a dummy function
        Type Parameters:
        T - the input type
        R - the result type
        Returns:
        the function

      • supplier

        public static <T> java.util.function.Supplier<T> supplier()
        Creates a dummy supplier
        Type Parameters:
        T - the result type
        Returns:
        the supplier

      • runnable

        public static java.lang.Runnable runnable()
        Creates a dummy runnable
        Returns:
        the runnable

      • ifNull

        public static <T> java.util.function.Consumer<T> ifNull​(java.util.function.Consumer<T> c)
        Returns the given consumer object if it is not null. Otherwise, a consumer() is returned. This is useful to avoid using null.
        Parameters:
        c - the consumer function to check for null
        Returns:
        a non-null consumer

      • ifNull

        public static Callback ifNull​(Callback c)
        Returns the given callback object if it is not null. Otherwise, a callback() is returned. This is useful to avoid using null.
        Parameters:
        c - the callback function to check for null
        Returns:
        a non-null callback function

      • ifNull

        public static <T,​R> java.util.function.Function<T,​R> ifNull​(java.util.function.Function<T,​R> f)
        Returns the given function object if it is not null. Otherwise, a function() is returned. This is useful to avoid using null.
        Type Parameters:
        T - the input type
        R - the result type
        Parameters:
        f - the function to check for null
        Returns:
        a non-null function

      • ifNull

        public static <T> java.util.function.Supplier<T> ifNull​(java.util.function.Supplier<T> s)
        Returns the given callback object if it is not null. Otherwise, a callback() is returned. This is useful to avoid using null.
        Parameters:
        s - the supplier function to check for null
        Returns:
        a non-null supplier

      • ifNull

        public static java.lang.Runnable ifNull​(java.lang.Runnable r)
        Returns the given runnable object if it is not null. Otherwise, a runnable() is returned. This is useful to avoid using null.
        Parameters:
        r - the runnable function to check for null
        Returns:
        a non-null runnable