Package it.unimi.dsi.lama4j

Class Trivial

java.lang.Object

it.unimi.dsi.lama4j.AbstractLattice

it.unimi.dsi.lama4j.AbstractDistributiveLattice

it.unimi.dsi.lama4j.Trivial

All Implemented Interfaces:

Lattice

public class Trivial
extends AbstractDistributiveLattice

The trivial distributive lattice of just one element.

Field Summary

Fields inherited from interface it.unimi.dsi.lama4j.Lattice

RING, UTF8

Constructor Summary

Constructors

Constructor	Description
Trivial()

Method Summary

Modifier and Type	Method	Description
Collection<Element>	generators()	Return a collection of generators for the lattice.
Element	join(Element... elements)	Return the join of the provided elements.
Element	meet(Element... elements)	Return the meet of the provided elements.
Element	one()	Return the one of this lattice.
String	toString()
Element	valueOf(String name)	Return an element of this lattice, given its name.
Element	zero()	Return the zero of this lattice.

Methods inherited from class it.unimi.dsi.lama4j.AbstractDistributiveLattice

isDistributive

Methods inherited from class it.unimi.dsi.lama4j.AbstractLattice

comp, coveringRelation, elements, ensureElementsInLattice, ensureElementsInLattice, ensureElementsInLattice, leq, pscomp, psdiff, symdiff, valueOfZeroOrOne

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Trivial

public Trivial()

Method Details

valueOf

public Element valueOf(String name)

Description copied from interface: Lattice

Return an element of this lattice, given its name.

Certain lattices make it possible to define names for elements. This method returns the element corresponding to the provided name.

Parameters:

name - the name of an element of this lattice.

Returns:

the element of this lattice named name.

generators

public Collection<Element> generators()

Description copied from interface: Lattice

Return a collection of generators for the lattice. The set will not include zero or one. There is no guarantee of freeness or minimality.

Returns:

a collection of generators.

one

public Element one()

Description copied from interface: Lattice

Return the one of this lattice.

Note that there is no guarantee that the returned element is the only element representing one in this lattice. Other ones may arise from computations, but they will always be equal to the element returned by this method.

Returns:

the one of this lattice.

zero

public Element zero()

Description copied from interface: Lattice

Return the zero of this lattice.

Note that there is no guarantee that the returned element is the only element representing zero in this lattice. Other zeroes may arise from computations, but they will always be equal to the element returned by this method.

Returns:

the zero of this lattice.

join

public Element join(Element... elements)

Description copied from interface: Lattice

Return the join of the provided elements. In particular, upon the empty list of arguments returns zero, and upon a singleton list the only specified element.

Parameters:

elements - the elements whose join has to be computed.

Returns:

the join of the provided elements.

meet

public Element meet(Element... elements)

Description copied from interface: Lattice

Return the meet of the provided elements. In particular, upon the empty list of arguments returns one, and upon a singleton list the only specified element.

Parameters:

elements - the elements whose meet has to be computed.

Returns:

the meet of the provided elements.

toString

public String toString()

Overrides:

toString in class Object