Package 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

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

  • Method Details

    • 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