org.apache.commons.collections4.functors

Class DefaultEquator<T>

    • Field Detail

      • INSTANCE

        public static final DefaultEquator INSTANCE
        Static instance

      • HASHCODE_NULL

        public static final int HASHCODE_NULL
        Hashcode used for null objects.
        See Also:
        Constant Field Values

    • Method Detail

      • defaultEquator

        public static <T> DefaultEquator<T> defaultEquator()
        Factory returning the typed singleton instance.
        Type Parameters:
        T - the object type
        Returns:
        the singleton instance

      • equate

        public boolean equate(T o1,
                      T o2)
        Evaluates the two arguments for their equality. Delegates to Object.equals(Object).
        Specified by:
        equate in interface  Equator<T>
        Parameters:
        o1 - the first object to be equated.
        o2 - the second object to be equated.
        Returns:
        whether the two objects are equal.

      • hash

        public int hash(T o)
        Calculates the hash for the object, based on the method of equality used in the equate method. This is used for classes that delegate their equals(Object) method to an Equator (and so must also delegate their hashCode() method), or for implementations of HashedMap that use an Equator for the key objects.
        Specified by:
        hash in interface  Equator<T>
        Parameters:
        o - the object to calculate the hash for.
        Returns:
        o.hashCode() if o is non- null, else HASHCODE_NULL.