de.bsd.x2svg
Class Cardinality

java.lang.Object
  de.bsd.x2svg.Cardinality

public class Cardinality
extends java.lang.Object

Cardinalities for elements. This is expressed as [from,to] with from being the lower bound and to the upper. If 'from' is 0, the Cardinality is optional. If the flag 'empty' is set, then the Cardinality is optional, but from is marked as the empty string. This is done to allow for rendering of elements like a non-optional element, while still having a an empty 'from value.

Author:

hwr@pilhuhn.de

Nested Class Summary

static class

Cardinality.DTDValues Cardinalities as found in DTDs

Field Summary

private boolean	empty
private java.lang.String	from lower value
private java.lang.String	to upper value

Constructor Summary

Cardinality(boolean empty)
Construct a Cardinality object where to and from are empty.

Cardinality(Cardinality.DTDValues dtdValue)
Construct a Cardinality object by means of values from a DTD

Cardinality(int from, int to)
Construct a Cardinality object with explicitly given from and to Note: infinite must be given as Integer.MAX_VALUE

Cardinality(java.lang.String from, java.lang.String to)
Construct a Cardinality object with explicitly given from and to as String

Method Summary

java.lang.String	getFrom()
java.lang.String	getTo()
boolean	isOptional() Is this element optional (from is 0 or empty or null)

Methods inherited from class java.lang.Object

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

Field Detail

from

private java.lang.String from

lower value

to

private java.lang.String to

upper value

empty

private boolean empty

Constructor Detail

Cardinality

public Cardinality(boolean empty)

Construct a Cardinality object where to and from are empty. This can be used if X2svg renders structures where giving a Cardinality makes no sense.

Parameters:

empty - true if no cardinality should be used.

Cardinality

public Cardinality(java.lang.String from,
                   java.lang.String to)

Construct a Cardinality object with explicitly given from and to as String

Parameters:

from - the lower value of the cardinality pair

to - upper value of cardinality pair. Infinite should be given as Asterisk ('*')

Cardinality

public Cardinality(int from,
                   int to)

Construct a Cardinality object with explicitly given from and to Note: infinite must be given as Integer.MAX_VALUE

Parameters:

from - the lower value of the cardinality pair

to - upper value of cardinality pair. Unbounded is expressed as -1

Cardinality

public Cardinality(Cardinality.DTDValues dtdValue)

Construct a Cardinality object by means of values from a DTD

Parameters:

dtdValue - Cardinalities as found in DTDs

Method Detail

isOptional

public boolean isOptional()

Is this element optional (from is 0 or empty or null)

Returns:

true if the element is an optional element

getFrom

public java.lang.String getFrom()

Returns:

the lower value of the cardinality pair

getTo

public java.lang.String getTo()

Returns:

the higher value of the cardinality pair