Package com.sun.msv.grammar.xmlschema

Class OccurrenceExp

java.lang.Object

com.sun.msv.grammar.Expression

com.sun.msv.grammar.OtherExp

com.sun.msv.grammar.xmlschema.OccurrenceExp

All Implemented Interfaces:

Serializable

public class OccurrenceExp
extends OtherExp

Used to mark a occurrence constraint which cannot be easily represented by primitive expressions.

This expression is just a marker, and the exp field of this instance still contains the precise expression of the occurrence constraint.

For example, if A is maxOccurs=5 and minOccurs=3, then the exp field of this instance will be: A,A,A,(A,A?)?, the maxOccurs field will be 5, the minOccurs field will be 3, and the itemExp field will hold a reference to A.

Note that MSV doesn't using this marker by itself. It is intended to help other applications that use the AGM of MSV.

Also note that this expression will not be used in the following cases to avoid excessive allocation of this expression:

• when maxOccurs=unbounded and minOccurs is 1 or 0
• when maxOccurs=1

Those cases can be expressed quite nicely with existing primitives So the client shouldn't find it difficuult to process them. I appreciate any feedback on this issue.

Author:

Kohsuke Kawaguchi ([email protected])

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
final Expression	itemExp	The unit of repetition.
final int	maxOccurs	Maximum occurence.
final int	minOccurs	Minimum occurence.

Fields inherited from class com.sun.msv.grammar.OtherExp

exp

Fields inherited from class com.sun.msv.grammar.Expression

anyString, epsilon, nullSet, verifierTag

Constructor Summary

Constructors

Constructor	Description
OccurrenceExp(Expression preciseExp, int maxOccurs, int minOccurs, Expression itemExp)

Method Summary

Modifier and Type	Method	Description
String	toString()	Obtains a string representation suitable for quick debugging.

Methods inherited from class com.sun.msv.grammar.OtherExp

calcEpsilonReducibility, calcHashCode, equals, printName, visit, visit, visit, visit

Methods inherited from class com.sun.msv.grammar.Expression

getExpandedExp, hashCode, hashCode, hashCode, isEpsilonReducible, peelOccurence, readResolve, visit, visit, visit, visit

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

maxOccurs

public final int maxOccurs

Maximum occurence. -1 to indicate "unbounded"

minOccurs

public final int minOccurs

Minimum occurence.

itemExp

public final Expression itemExp

The unit of repetition.

Constructor Details

OccurrenceExp

public OccurrenceExp(Expression preciseExp,
 int maxOccurs,
 int minOccurs,
 Expression itemExp)

Method Details

toString

public String toString()

Obtains a string representation suitable for quick debugging.

Overrides:

toString in class Object