public class

SimpleContentModel

extends Object
implements ContentModelValidator
java.lang.Object
   ↳ org.apache.xerces.impl.dtd.models.SimpleContentModel

Class Overview

SimpleContentModel is a derivative of the abstract content model base class that handles a small set of simple content models that are just way overkill to give the DFA treatment.

This class handles the following scenarios:

  • a
  • a?
  • a*
  • a+
  • a,b
  • a|b

These all involve a unary operation with one element type, or a binary operation with two elements. These are very simple and can be checked in a simple way without a DFA and without the overhead of setting up a DFA for such a simple check.@xerces.internal

Summary

Constants
short CHOICE CHOICE
short SEQUENCE SEQUENCE
Public Constructors
SimpleContentModel(short operator, QName firstChild, QName secondChild)
Constructs a simple content model.
Public Methods
int validate(QName[] children, int offset, int length)
Check that the specified content is valid according to this content model.
[Expand]
Inherited Methods
From class java.lang.Object
From interface org.apache.xerces.impl.dtd.models.ContentModelValidator

Constants

public static final short CHOICE

CHOICE

Constant Value: -1 (0xffffffff)

public static final short SEQUENCE

SEQUENCE

Constant Value: -1 (0xffffffff)

Public Constructors

public SimpleContentModel (short operator, QName firstChild, QName secondChild)

Constructs a simple content model.

Parameters
operator The content model operator.
firstChild qualified name of the first child
secondChild qualified name of the second child

Public Methods

public int validate (QName[] children, int offset, int length)

Check that the specified content is valid according to this content model. This method can also be called to do 'what if' testing of content models just to see if they would be valid.

A value of -1 in the children array indicates a PCDATA node. All other indexes will be positive and represent child elements. The count can be zero, since some elements have the EMPTY content model and that must be confirmed.

Parameters
children The children of this element. Each integer is an index within the StringPool of the child element name. An index of -1 is used to indicate an occurrence of non-whitespace character data.
offset Offset into the array where the children starts.
length The number of entries in the children array.
Returns
  • The value -1 if fully valid, else the 0 based index of the child that first failed. If the value returned is equal to the number of children, then the specified children are valid but additional content is required to reach a valid ending state.