org.apache.calcite.util

Interface PartiallyOrderedSet.Ordering<E>

Type Parameters:

E - Element type

Enclosing class:

PartiallyOrderedSet<E>

public static interface PartiallyOrderedSet.Ordering<E>

Ordering relation.

To obey the constraints of the partially-ordered set, the function must be consistent with the reflexive, anti-symmetric, and transitive properties required by a partially ordered set.

For instance, if ordering(foo, foo) returned false for any not-null value of foo, it would violate the reflexive property.

If an ordering violates any of these required properties, the behavior of a PartiallyOrderedSet is unspecified. (But mayhem is likely.)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	lessThan(E e1, E e2) Returns whether element e1 is ≤ e2 according to the relation that defines a partially-ordered set.

Method Detail

lessThan

boolean lessThan(E e1,
               E e2)

Returns whether element e1 is ≤ e2 according to the relation that defines a partially-ordered set.

Parameters:

e1 - Element 1

e2 - Element 2

Returns:

Whether element 1 is ≤ element 2