net.sf.saxon.value
Class Cardinality

java.lang.Object
  net.sf.saxon.value.Cardinality

public final class Cardinality
extends Object

This class contains static methods to manipulate the cardinality property of a type. Cardinality of expressions is denoted by one of the values ONE_OR_MORE, ZERO_OR_MORE, ZERO_OR_ONE, EXACTLY_ONE, or EMPTY. These are combinations of the three bit-significant values ALLOWS_ZERO, ALLOWS_ONE, and ALLOWS_MANY.

Method Summary

static int	add(int c1, int c2) Add two cardinalities
static boolean	allowsMany(int cardinality) Determine whether multiple occurrences are allowed
static boolean	allowsZero(int cardinality) Determine whether empty sequence is allowed
static String	getOccurrenceIndicator(int cardinality) Get the occurence indicator representing the cardinality
static int	multiply(int c1, int c2) Multiply two cardinalities
static boolean	subsumes(int c1, int c2) Test if one cardinality subsumes another.
static int	sum(int c1, int c2) Form the sum of two cardinalities
static String	toString(int cardinality) Display the cardinality
static int	union(int c1, int c2) Form the union of two cardinalities.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

allowsMany

public static final boolean allowsMany(int cardinality)

Determine whether multiple occurrences are allowed

allowsZero

public static final boolean allowsZero(int cardinality)

Determine whether empty sequence is allowed

union

public static final int union(int c1,
                              int c2)

Form the union of two cardinalities. The cardinality of the expression "if (c) then e1 else e2" is the union of the cardinalities of e1 and e2.

Parameters:

c1 - a cardinality

c2 - another cardinality

Returns:

the cardinality that allows both c1 and c2

sum

public static final int sum(int c1,
                            int c2)

Form the sum of two cardinalities

subsumes

public static final boolean subsumes(int c1,
                                     int c2)

Test if one cardinality subsumes another. Cardinality c1 subsumes c2 if every option permitted by c2 is also permitted by c1.

Parameters:

c1 - a cardinality

c2 - another cardinality

Returns:

true if if every option permitted by c2 is also permitted by c1.

add

public static final int add(int c1,
                            int c2)

Add two cardinalities

multiply

public static final int multiply(int c1,
                                 int c2)

Multiply two cardinalities

toString

public static String toString(int cardinality)

Display the cardinality

getOccurrenceIndicator

public static String getOccurrenceIndicator(int cardinality)

Get the occurence indicator representing the cardinality