Package org.apache.commons.functor.core.collection

Class IsEmpty<A>

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static IsEmpty<java.lang.Object> INSTANCE
      Basic IsEmpty instance.
      private static long serialVersionUID
      serialVersionUID declaration.

    • Constructor Summary

      Constructors 
      Constructor Description
      IsEmpty()
      Create a new IsEmpty.

    • 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 <A> IsEmpty<A> instance()
      Get an IsEmpty instance.
      boolean test​(A obj)
      Evaluate this predicate.
      private boolean testArray​(java.lang.Object array)
      Test an array.
      private boolean testCollection​(java.util.Collection<?> col)
      Test a collection.
      private boolean testMap​(java.util.Map<?,​?> map)
      Test a map.
      private boolean testString​(java.lang.String str)
      Test a string.
      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 IsEmpty<java.lang.Object> INSTANCE
        Basic IsEmpty instance.

      • serialVersionUID

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

    • Constructor Detail

      • IsEmpty

        public IsEmpty()
        Create a new IsEmpty.

    • Method Detail

      • test

        public boolean test​(A obj)
        Evaluate this predicate.
        Specified by:
        test in interface UnaryPredicate<A>
        Parameters:
        obj - the A object to test
        Returns:
        the result of this test

      • 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

      • testCollection

        private boolean testCollection​(java.util.Collection<?> col)
        Test a collection.
        Parameters:
        col - to test
        Returns:
        boolean

      • testMap

        private boolean testMap​(java.util.Map<?,​?> map)
        Test a map.
        Parameters:
        map - to test
        Returns:
        boolean

      • testString

        private boolean testString​(java.lang.String str)
        Test a string.
        Parameters:
        str - to test
        Returns:
        boolean

      • testArray

        private boolean testArray​(java.lang.Object array)
        Test an array.
        Parameters:
        array - to test
        Returns:
        boolean

      • instance

        public static <A> IsEmpty<A> instance()
        Get an IsEmpty instance.
        Type Parameters:
        A - the predicate argument type.
        Returns:
        IsEmpty