Examples of com.sun.msv.reader.State

com.sun.msv.reader.State
base interface of 'parsing state'. parsing of XML representation of a grammar is done by using various states.
Each State-derived class is responsible for a particular type of declaration of the grammar. For example, SequenceState is responsible for parsing <sequence> element of RELAX module.
State objects interact each other. There are two ways of interaction.
- from parent to child
- from child to parent
The first type of communication occurs only when a child state object is created. The last type of communication occurs usually (but not limited to) when a child state sees its end tag.
In this level of inheritance, contract is somewhat abstract.
1. When a State object is created, its init method is called and various information is set. Particularly, start tag information (if any) and the parent state is set. This process should only be initiated by GrammarReader.
2. After that, startSelf method is called. Usually, this is the place to do something useful.
3. State object is registered as a ContentHandler, and therefore will receive SAX events from now on.
4. Derived classes are expected to do something useful by receiving SAX events.
5. When a State object finishes its own part, it should call GrammarReader.popState method. It will remove the current State object and registers the parent state as a ContentHandler again.
Of course some derived classes introduce more restricted contract. See {@link SimpleState}.
this class also provides:
- access to the parent state
- default implementations for all ContentHandler callbacks except startElement and endElement
@author Kohsuke KAWAGUCHI

    }
    
    protected State createChildState( StartTagInfo tag ) {
        final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
        
        State s;
        if( super.exp==Expression.epsilon ) {
            // model group must be the first expression child.
            s = reader.createModelGroupState(this,tag);
            if(s!=null )    return s;
        }

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        // simpleContent, ComplexContent, group, all, choice, and sequence
        // are allowed only when we haven't seen type definition.
        if(tag.localName.equals("simpleContent") )    return reader.sfactory.simpleContent(this,tag,decl);
        if(tag.localName.equals("complexContent") )    return reader.sfactory.complexContent(this,tag,decl);
        State s = reader.createModelGroupState(this,tag);
        if(s!=null)        return s;
        
        if( super.exp==null ) {
            // no content model was given.
            // I couldn't "decipher" what should we do in this case.

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    {// within the island of XSD, foreign namespaces are prohibited.
        final StartTagInfo tag = new StartTagInfo(
            namespaceURI,localName,qName,new AttributesImpl(atts),(IDContextProvider2)null);
        // we have to copy Attributes, otherwise it will be mutated by SAX parser
            
        State nextState = createChildState(tag);
        if(nextState!=null) {
            reader.pushState(nextState,this,tag);
            return;
        }

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            return Expression.anyString;
        }
    }
    
    protected State createChildState( StartTagInfo tag ) {
        State next = getReader().createFacetState(this,tag);
        if(next!=null)        return next;            // facets
        
        return super.createChildState(tag);            // or delegate to the base class
    }

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        // grammar has to be treated separately so as not to
        // create unnecessary TREXGrammar object.
        if(tag.localName.equals("grammar"))
            return new GrammarState();
        
        State s = super.createChildState(tag);
        if(s!=null) {
            // other pattern element is specified.
            // create wrapper grammar
            final TREXBaseReader reader = (TREXBaseReader)this.reader;
            reader.grammar = reader.sfactory.createGrammar( reader.pool, null );

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    protected State createChildState( StartTagInfo tag )
    {
        if( !tag.namespaceURI.equals(RELAXCoreReader.RELAXCoreNamespace) )    return null;
        
        State next;
        
        // particles
        next = reader.createExpressionChildState(this,tag);
        if(next!=null)        return next;

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        // grammar has to be treated separately so as not to
        // create unnecessary TREXGrammar object.
//        if(tag.localName.equals("grammar"))
//            return new GrammarState();
        
        State s = reader.createExpressionChildState(this,tag);
//        if(s!=null) {
//            // other pattern element is specified.
//            // create wrapper grammar
//            final TREXBaseReader reader = (TREXBaseReader)this.reader;
//            reader.grammar = new TREXGrammar( reader.pool, null );

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        final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
        
        if( incubator==null && tag.localName.equals("simpleType") )
            return reader.sfactory.simpleType(this,tag);
        
        State s = reader.createAttributeState(this,tag);
        if(s!=null )    return s;
        
        return reader.createFacetState(this,tag);    // facets
    }

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    }


    protected State createChildState(StartTagInfo tag) {
        if (nameClass == null) // nameClass should be specified before content model.
            {
            State nextState = ((TREXBaseReader) reader).createNameClassChildState(this, tag);
            if (nextState != null)
                return nextState;


            // to provide better error message, analyze the situation further.
            // users tend to forget to supply nameClass and name attribute.

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        // grammar has to be treated separately so as not to
        // create unnecessary TREXGrammar object.
//        if(tag.localName.equals("grammar"))
//            return new GrammarState();
        
        State s = reader.createExpressionChildState(this,tag);
//        if(s!=null) {
//            // other pattern element is specified.
//            // create wrapper grammar
//            final TREXBaseReader reader = (TREXBaseReader)this.reader;
//            reader.grammar = new TREXGrammar( reader.pool, null );

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