Package com.sun.msv.reader.xmlschema

Class AttributeWildcardComputer

java.lang.Object

com.sun.msv.grammar.util.ExpressionWalker

com.sun.msv.reader.xmlschema.AttributeWildcardComputer

All Implemented Interfaces:

ExpressionVisitorVoid

public class AttributeWildcardComputer
extends ExpressionWalker

Processes the attribtue wildcard according to the spec.

Since the definition of the attribute wildcard is very adhoc, it cannot be naturally caputred by our AGM.

Therefore, when we parse a schema, we just parse <anyAttribute> directly. After all components are loaded, arcane computation is done to correctly compute the attribute wildcard.

Attribute wildcard will be ultimately converted into an expression, and that will be attached to the ComplexTypeExp.attWildcard.

This class also computes the attribute propagation that happens only when a complex type is derived by restriction. Consider the following fragment:

 <complexType name="base">
   <attribute name="abc" ... />
 </complexType>
 
 <complexType name="derived">
   <complexContent>
     <restriction base="base"/>
   </complexContent>
 </complexType>
 

According to the spec, the derived type will have the 'abc' attribute. By "propagation", we mean this behavior.

Field Summary

Fields

Modifier and Type	Field	Description
private XMLSchemaReader	reader
private java.util.Stack	unprocessedElementExps
private java.util.Set	visitedExps	Visited ElementExps and ReferenceExps to prevent infinite recursion.
private java.util.Set	wildcards	Used to collect AttributeWildcards of children.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AttributeWildcardComputer(XMLSchemaReader _reader)

Method Summary

Modifier and Type	Method	Description
private AttributeWildcard	calcCompleteWildcard(AttributeWildcard local, java.util.Set s)	Computes the "complete attribute wildcard"
private AttributeWildcard	calcComplexTypeWildcard(AttributeWildcard complete, AttributeWildcard base)
private void	compute(Expression topLevel)
static void	compute(XMLSchemaReader reader, Expression topLevel)
void	onElement(ElementExp exp)
void	onRef(ReferenceExp exp)
private void	propagateAttributes(ComplexTypeExp cexp)	Computes the propagated attributes.

Methods inherited from class com.sun.msv.grammar.util.ExpressionWalker

onAnyString, onAttribute, onBinExp, onChoice, onConcur, onData, onEpsilon, onInterleave, onList, onMixed, onNullSet, onOneOrMore, onOther, onSequence, onValue

Methods inherited from class java.lang.Object

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

Field Detail

reader

private final XMLSchemaReader reader

visitedExps

private final java.util.Set visitedExps

Visited ElementExps and ReferenceExps to prevent infinite recursion.

unprocessedElementExps

private final java.util.Stack unprocessedElementExps

wildcards

private java.util.Set wildcards

Used to collect AttributeWildcards of children.

Constructor Detail

AttributeWildcardComputer

protected AttributeWildcardComputer(XMLSchemaReader _reader)

Method Detail

compute

public static void compute(XMLSchemaReader reader,
                           Expression topLevel)

compute

private void compute(Expression topLevel)

onElement

public void onElement(ElementExp exp)

Specified by:

onElement in interface ExpressionVisitorVoid

Overrides:

onElement in class ExpressionWalker

onRef

public void onRef(ReferenceExp exp)

Specified by:

onRef in interface ExpressionVisitorVoid

Overrides:

onRef in class ExpressionWalker

calcCompleteWildcard

private AttributeWildcard calcCompleteWildcard(AttributeWildcard local,
                                               java.util.Set s)

Computes the "complete attribute wildcard"

calcComplexTypeWildcard

private AttributeWildcard calcComplexTypeWildcard(AttributeWildcard complete,
                                                  AttributeWildcard base)

propagateAttributes

private void propagateAttributes(ComplexTypeExp cexp)

Computes the propagated attributes.