org.apache.xerces.impl.dtd.models
Class SimpleContentModel

java.lang.Object
  extended by org.apache.xerces.impl.dtd.models.SimpleContentModel
All Implemented Interfaces:
ContentModelValidator

public class SimpleContentModel
extends java.lang.Object
implements ContentModelValidator

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:

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.

Version:
$Id: SimpleContentModel.java 699892 2008-09-28 21:08:27Z mrglavas $

INTERNAL:

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

Field Summary
static short CHOICE
          CHOICE
static short SEQUENCE
          SEQUENCE
 
Constructor Summary
SimpleContentModel(short operator, org.apache.xerces.xni.QName firstChild, org.apache.xerces.xni.QName secondChild)
          Constructs a simple content model.
 
Method Summary
 int validate(org.apache.xerces.xni.QName[] children, int offset, int length)
          Check that the specified content is valid according to this content model.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

CHOICE

public static final short CHOICE
CHOICE

See Also:
Constant Field Values

SEQUENCE

public static final short SEQUENCE
SEQUENCE

See Also:
Constant Field Values
Constructor Detail

SimpleContentModel

public SimpleContentModel(short operator,
                          org.apache.xerces.xni.QName firstChild,
                          org.apache.xerces.xni.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
Method Detail

validate

public int validate(org.apache.xerces.xni.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.

Specified by:
validate in interface ContentModelValidator
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.


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