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

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

All Implemented Interfaces:

XSCMValidator

public class XSDFACM

extends java.lang.Object

implements XSCMValidator

DFAContentModel is the implementation of XSCMValidator that does all of the non-trivial element content validation. This class does the conversion from the regular expression to the DFA that it then uses in its validation algorithm.

INTERNAL:

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

Version:

$Id: XSDFACM.java,v 1.13 2004/10/06 15:14:52 mrglavas Exp $

Author:

Neil Graham, IBM

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

FIRST_ERROR, SUBSEQUENT_ERROR

Constructor Summary

XSDFACM(CMNode syntaxTree, int leafCount)
Constructs a DFA content model.

Method Summary

boolean	checkUniqueParticleAttribution(SubstitutionGroupHandler subGroupHandler) check whether this content violates UPA constraint.
boolean	endContentModel(int[] state) The method indicates the end of list of children
boolean	isFinalState(int state) check whether the given state is one of the final states
java.lang.Object	oneTransition(org.apache.xerces.xni.QName curElem, int[] state, SubstitutionGroupHandler subGroupHandler) one transition only
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

XSDFACM

public XSDFACM(CMNode syntaxTree,
               int leafCount)

Constructs a DFA content model.

Parameters:

syntaxTree - The syntax tree of the content model.

leafCount - The number of leaves.

Throws:

java.lang.RuntimeException - Thrown if DFA can't be built.

Method Detail

isFinalState

public boolean isFinalState(int state)

check whether the given state is one of the final states

Parameters:

state - the state to check

Returns:

whether it's a final state

oneTransition

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

one transition only

Specified by:

oneTransition in interface XSCMValidator

Parameters:

curElem - The current element's QName

state - stack to store the previous state

subGroupHandler - the substitution group handler

Returns:

null if transition is invalid; otherwise the Object corresponding to the XSElementDecl or XSWildcardDecl identified. Also, the state array will be modified to include the new state; this so that the validator can store it away.

Throws:

java.lang.RuntimeException - thrown on error

startContentModel

public int[] startContentModel()

Description copied from interface: XSCMValidator

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

Following copied from interface: org.apache.xerces.impl.xs.models.XSCMValidator

Returns:

Start state of the content model

endContentModel

public boolean endContentModel(int[] state)

Description copied from interface: XSCMValidator

The method indicates the end of list of children

Specified by:

endContentModel in interface XSCMValidator

Following copied from interface: org.apache.xerces.impl.xs.models.XSCMValidator

Parameters:

state - 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.