Package org.apache.commons.functor.core.composite

Class TransposedFunction<L,​R,​T>

  • Type Parameters:
    L - the left argument type.
    R - the right argument type.
    T - the returned value type.
    All Implemented Interfaces:
    java.io.Serializable, BinaryFunction<L,​R,​T>, BinaryFunctor<L,​R>, Functor
    public class TransposedFunction<L,​R,​T>
extends java.lang.Object
implements BinaryFunction<L,​R,​T>, java.io.Serializable
    Transposes (swaps) the arguments to some other function. For example, given a function f and the ordered pair of arguments a, b. evaluates to f.evaluate(b,a).

    Note that although this class implements Serializable, a given instance will only be truly Serializable if the underlying functor is. Attempts to serialize an instance whose delegate is not Serializable will result in an exception.

    Version:
    $Revision$ $Date$
    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private BinaryFunction<? super R,​? super L,​? extends T> function
      The adapted function.
      private static long serialVersionUID
      serialVersionUID declaration.

    • Constructor Summary

      Constructors 
      Constructor Description
      TransposedFunction​(BinaryFunction<? super R,​? super L,​? extends T> function)
      Create a new TransposedFunction.

    • Method Summary

      All Methods Static Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean equals​(java.lang.Object that)
      Indicates whether some other object is "equal to" this functor.
      boolean equals​(TransposedFunction<?,​?,​?> that)
      Learn whether another TransposedFunction is equal to this.
      T evaluate​(L left, R right)
      Evaluate this function.
      int hashCode()
      Returns a hash code for this functor adhering to the general Object.hashCode contract.
      java.lang.String toString()
      Returns a human readable description of this functor.
      static <L,​R,​T>
      TransposedFunction<R,​L,​T>      		 transpose​(BinaryFunction<? super L,​? super R,​? extends T> f)
      Transpose a BinaryFunction.

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    • Field Detail

      • serialVersionUID

        private static final long serialVersionUID
        serialVersionUID declaration.
        See Also:
        Constant Field Values

      • function

        private final BinaryFunction<? super R,​? super L,​? extends T> function
        The adapted function.

    • Constructor Detail

      • TransposedFunction

        public TransposedFunction​(BinaryFunction<? super R,​? super L,​? extends T> function)
        Create a new TransposedFunction.
        Parameters:
        function - BinaryFunction to transpose.

    • Method Detail

      • evaluate

        public final T evaluate​(L left,
                        R right)
        Evaluate this function.
        Specified by:
        evaluate in interface BinaryFunction<L,​R,​T>
        Parameters:
        left - the L element of the ordered pair of arguments
        right - the R element of the ordered pair of arguments
        Returns:
        the T result of this function for the given arguments

      • equals

        public final boolean equals​(java.lang.Object that)
        Indicates whether some other object is "equal to" this functor. This method must adhere to general Object.equals contract. Additionally, this method can return true only if the specified Object implements the same functor interface and is known to produce the same results and/or side-effects for the same arguments (if any).

        While implementators are strongly encouraged to override the default Object implementation of this method, note that the default Object implementation does in fact adhere to the functor equals contract.

        Specified by:
        equals in interface Functor
        Overrides:
        equals in class java.lang.Object
        Parameters:
        that - the object to compare this functor to
        Returns:
        true iff the given object implements this functor interface, and is known to produce the same results and/or side-effects for the same arguments (if any).
        See Also:
        Functor.hashCode()

      • equals

        public final boolean equals​(TransposedFunction<?,​?,​?> that)
        Learn whether another TransposedFunction is equal to this.
        Parameters:
        that - TransposedFunction to test
        Returns:
        boolean

      • hashCode

        public int hashCode()
        Returns a hash code for this functor adhering to the general Object.hashCode contract. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.
        Specified by:
        hashCode in interface Functor
        Overrides:
        hashCode in class java.lang.Object
        Returns:
        a hash code for this functor
        See Also:
        Functor.equals(java.lang.Object)

      • toString

        public java.lang.String toString()
        Returns a human readable description of this functor. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.
        Specified by:
        toString in interface Functor
        Overrides:
        toString in class java.lang.Object
        Returns:
        a human readable description of this functor

      • transpose

        public static <L,​R,​T> TransposedFunction<R,​L,​T> transpose​(BinaryFunction<? super L,​? super R,​? extends T> f)
        Transpose a BinaryFunction.
        Type Parameters:
        L - the left argument type.
        R - the right argument type.
        T - the returned value type.
        Parameters:
        f - BinaryFunction to transpose
        Returns:
        TransposedFunction