Re: Help needed with XSModel

9 Dec 2002 11:45:49 -0000 

Hi Frank,


I'm trying to implement the example code, found on the Xerces FAQ page for grammar 
parsing, http://xml.apache.org/xerces2-j/faq-grammars.html#faq-5, "examining 
grammars".
When I access my XSModel, I can retrieve a named map with element declarations, 
but only the top-level-elements are listed. Can someone tell me, how to access 
these elements, which are located deeper in the hierarchy of the corresponding 
schema, i.e.:


How can I retrieve the XSObjects "page" or "subnet" using the XSModel and 
the associated methods? Any idea?

As far as I know, each element declaration is part of its parent element type definition. In your case you have to get the XSElementDecl object of the root element

XSElementDecl parentElement = model.getElementDecl( "net", null );

Then you have to get the root type definition and its category:


     XSTypeDefinition typeDef = parentElement.getTypeDefinition();

     if( typeDef.getTypeCategory() == XSTypeDefinition.SIMPLE_TYPE )
     {
        //.....
       }

///////////////////////////////////////////////////////////////////////
else if( typeDef.getTypeCategory() == XSTypeDefinition.COMPLEX_TYPE )
{
//if complexType -> subelements possible
XSComplexTypeDecl complexTypeDef = (XSComplexTypeDecl) typeDef;
switch( complexTypeDef.getContentType() )
{
///////////////////////////////////////////////////////////////////
case XSComplexTypeDefinition.CONTENTTYPE_SIMPLE:
{
//complexType with simple content: no subelements
// possible
}

///////////////////////////////////////////////////////////////////
case XSComplexTypeDefinition.CONTENTTYPE_EMPTY:
{
//complexType without any childelements
}


///////////////////////////////////////////////////////////////////
case XSComplexTypeDefinition.CONTENTTYPE_ELEMENT:
{
XSParticleDecl[] particles = new XSParticleDecl[1];
particles[0] = (XSParticleDecl) complexTypeDef.getParticle();
//.....analyse particle
//this particle object can be a model group (like sequence, choice, all)
//or an element declaration (or an Wildcard)
//In your example it will be the sequence. This sequence references 2 particles objects, the 2
//element declarations of "page" and "subnet".
}


///////////////////////////////////////////////////////////////////
case XSComplexTypeDefinition.CONTENTTYPE_MIXED:
{
XSParticleDecl[] particles = new XSParticleDecl[1];
particles[0] = (XSParticleDecl) complexTypeDef.getParticle();
//.....analyse particle

           }
}

Use this code to recurse the particle tree and get all child element declarations
...........

XSTerm term;
//Either model group, a wildcard, or an element declaration
for( int i=0; i<particles.length; i++ )
{
term = particles[ i ].getTerm();
switch( term.getType() )
{
///////////////////////////////////////////////////////////////////////
case XSConstants.ELEMENT_DECLARATION:
{
//this is the element declaration object e.g. for "page"
(XSElementDecl) term;
System.out.println( term.getName() ); //->e.g. "page"
}

       break;

///////////////////////////////////////////////////////////////////////
case XSConstants.MODEL_GROUP:
{
XSModelGroupImpl modelGroup = (XSModelGroupImpl) term;
XSObjectListImpl objectList =
(XSObjectListImpl) modelGroup.getParticles();
int listLength = objectList.getLength();
XSParticleDecl[] particleList = new XSParticleDecl[ listLength ];
for( int a=0; a<listLength; a++ )
{
particleList[ a ] = (XSParticleDecl) objectList.getItem( a );
}
..............................

Kristian









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