dk.brics.xact.analysis.xmlgraph
Enum EPresence

java.lang.Object
  java.lang.Enum<EPresence>
      dk.brics.xact.analysis.xmlgraph.EPresence

All Implemented Interfaces:

Serializable, Comparable<EPresence>

public enum EPresence
extends Enum<EPresence>

A generic lattice denoting whether something is empty or non-empty.

Enum Constant Summary

BOTTOM

EMPTY

NONEMPTY

UNKNOWN

Method Summary

EPresence	concat(EPresence b) Returns whether the result is empty when concatenating the two elements.
boolean	definitelyEmpty()
boolean	definitelyNonEmpty()
EPresence	leastUpperBound(EPresence b)
boolean	maybeEmpty()
boolean	maybeNonEmpty()
static EPresence	valueOf(String name) Returns the enum constant of this type with the specified name.
static EPresence[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

BOTTOM

public static final EPresence BOTTOM

EMPTY

public static final EPresence EMPTY

NONEMPTY

public static final EPresence NONEMPTY

UNKNOWN

public static final EPresence UNKNOWN

Method Detail

concat

public EPresence concat(EPresence b)

Returns whether the result is empty when concatenating the two elements. For example, "EMPTY concat EMPTY" is EMPTY, and "EMPTY concat NONEMPTY" is NONEMPTY.

definitelyEmpty

public boolean definitelyEmpty()

definitelyNonEmpty

public boolean definitelyNonEmpty()

leastUpperBound

public EPresence leastUpperBound(EPresence b)

maybeEmpty

public boolean maybeEmpty()

maybeNonEmpty

public boolean maybeNonEmpty()

valueOf

public static EPresence valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

values

public static EPresence[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (EPresence c : EPresence.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared