Xerces2 Implementation: Class XSDFACM

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## 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.

Version:
  $Id: XSDFACM.java,v 1.10 2003/04/30 20:24:49 sandygao 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:
    `symbolTable` - The symbol table.
    `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
    `stateStack` - stack to store the previous state
    `curPos` - the current position of the stack
  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:
    `errors` - to hold the UPA errors
  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.

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