Package org.apache.commons.functor.core

Class IsInstance<T>

  • Type Parameters:
    T - the object instance has to be tested against the input class.
    All Implemented Interfaces:
    java.io.Serializable, BinaryFunctor<T,​java.lang.Class<?>>, BinaryPredicate<T,​java.lang.Class<?>>, Functor
    public final class IsInstance<T>
extends java.lang.Object
implements BinaryPredicate<T,​java.lang.Class<?>>, java.io.Serializable
    Tests true iff its argument is an instance of some specified Class.
    Version:
    $Revision$ $Date$
    See Also:
    Serialized Form

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static IsInstance<java.lang.Object> INSTANCE
      Basic IsInstanceOf instance.
      private static int NONZERO_BITWISE_NUMBER
      The non zero number used to bitwise or the hashcode.
      private static int NONZERO_SHIFT_NUMBER
      The non zero number used to shift the initial hashcode.
      private static long serialVersionUID
      serialVersionUID declaration.

    • Constructor Summary

      Constructors 
      Constructor Description
      IsInstance()  

    • 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.
      int hashCode()
      Returns a hash code for this functor adhering to the general Object.hashCode contract.
      static <T> IsInstance<T> instance()
      Get an IsInstance instance.
      static <T> UnaryPredicate<T> of​(java.lang.Class<?> clazz)
      Get an IsInstanceOf UnaryPredicate.
      boolean test​(T left, java.lang.Class<?> right)
      Evaluate this predicate.
      java.lang.String toString()
      Returns a human readable description of this functor.

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • INSTANCE

        public static final IsInstance<java.lang.Object> INSTANCE
        Basic IsInstanceOf instance.

      • serialVersionUID

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

      • NONZERO_SHIFT_NUMBER

        private static final int NONZERO_SHIFT_NUMBER
        The non zero number used to shift the initial hashcode.
        See Also:
        Constant Field Values

      • NONZERO_BITWISE_NUMBER

        private static final int NONZERO_BITWISE_NUMBER
        The non zero number used to bitwise or the hashcode.
        See Also:
        Constant Field Values

    • Constructor Detail

      • IsInstance

        public IsInstance()

    • Method Detail

      • test

        public boolean test​(T left,
                    java.lang.Class<?> right)
        Evaluate this predicate.
        Specified by:
        test in interface BinaryPredicate<T,​java.lang.Class<?>>
        Parameters:
        left - the L element of the ordered pair of arguments
        right - the R element of the ordered pair of arguments
        Returns:
        the result of this test for the given arguments

      • equals

        public 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()

      • 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

      • instance

        public static <T> IsInstance<T> instance()
        Get an IsInstance instance.
        Type Parameters:
        T - the object instance has to be tested against the input class.
        Returns:
        IsInstance

      • of

        public static <T> UnaryPredicate<T> of​(java.lang.Class<?> clazz)
        Get an IsInstanceOf UnaryPredicate.
        Type Parameters:
        T - the object instance has to be tested against the input class.
        Parameters:
        clazz - bound right-side argument
        Returns:
        UnaryPredicate