org.apache.xerces.impl.xs.models
Class XSEmptyCM

java.lang.Object
  |
  +--org.apache.xerces.impl.xs.models.XSEmptyCM

All Implemented Interfaces:

XSCMValidator

public class XSEmptyCM

extends java.lang.Object

implements XSCMValidator

XSEmptyCM is a derivative of the abstract content model base class that handles a content model with no chilren (elements). This model validated on the way in.

INTERNAL:

Usage of this class is not supported. It may be altered or removed at any time.

Version:

$Id: XSEmptyCM.java,v 1.9 2004/10/06 15:14:53 mrglavas Exp $

Author:

Elena Litani, Lisa Martin, IBM

Fields inherited from interface org.apache.xerces.impl.xs.models.XSCMValidator

FIRST_ERROR, SUBSEQUENT_ERROR

Constructor Summary

XSEmptyCM()

Method Summary

boolean	checkUniqueParticleAttribution(SubstitutionGroupHandler subGroupHandler) check whether this content violates UPA constraint.
boolean	endContentModel(int[] currentState) The method indicates the end of list of children
java.lang.Object	oneTransition(org.apache.xerces.xni.QName elementName, int[] currentState, SubstitutionGroupHandler subGroupHandler) The method corresponds to one transaction in the content model.
int[]	startContentModel() This methods to be called on entering a first element whose type has this content model.
java.util.Vector	whatCanGoHere(int[] state) Check which elements are valid to appear at this point.

Methods inherited from class java.lang.Object

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

Constructor Detail

XSEmptyCM

public XSEmptyCM()

Method Detail

startContentModel

public int[] startContentModel()

This methods to be called on entering a first element whose type has this content model. It will return the initial state of the content model

Specified by:

startContentModel in interface XSCMValidator

Returns:

Start state of the content model

oneTransition

public java.lang.Object oneTransition(org.apache.xerces.xni.QName elementName,
                                      int[] currentState,
                                      SubstitutionGroupHandler subGroupHandler)

The method corresponds to one transaction in the content model.

Specified by:

oneTransition in interface XSCMValidator

Parameters:

elementName - the qualified name of the element

currentState - Current state

subGroupHandler - the substitution group handler

Returns:

element index corresponding to the element from the Schema grammar

endContentModel

public boolean endContentModel(int[] currentState)

The method indicates the end of list of children

Specified by:

endContentModel in interface XSCMValidator

Parameters:

currentState - Current state of the content model

Returns:

true if the last state was a valid final state

checkUniqueParticleAttribution

public boolean checkUniqueParticleAttribution(SubstitutionGroupHandler subGroupHandler)
                                       throws XMLSchemaException

check whether this content violates UPA constraint.

Specified by:

checkUniqueParticleAttribution in interface XSCMValidator

Parameters:

subGroupHandler - the substitution group handler

Returns:

true if this content model contains other or list wildcard

whatCanGoHere

public java.util.Vector whatCanGoHere(int[] state)

Check which elements are valid to appear at this point. This method also works if the state is in error, in which case it returns what should have been seen.

Specified by:

whatCanGoHere in interface XSCMValidator

Parameters:

state - the current state

Returns:

a Vector whose entries are instances of either XSWildcardDecl or XSElementDecl.