Examples of com.sun.msv.grammar.Expression$NullSetExpression

com.sun.msv.grammar.Expression
Primitive of the tree regular expression. most of the derived class is immutable (except ReferenceExp, ElementExp and OtherExp).
By making it immutable, it becomes possible to share subexpressions among expressions. This is very important for regular-expression-derivation based validation algorithm, as well as for smaller memory footprint. This sharing is automatically achieved by ExpressionPool.
ReferebceExp, ElementExp, and OtherExp are also placed in the pool, but these are not unified. Since they are not unified, application can derive classes from these expressions and mix them into AGM. This technique is heavily used to introduce schema language specific primitives into AGM. See various sub-packages of this package for examples.
The equals method must be implemented by the derived type. equals method will be used to unify the expressions. equals method can safely assume that its children are already unified (therefore == can be used to test the equality, rather than equals method).
To achieve unification, we overload the equals method so that o1.equals(o2) is true if o1 and o2 are identical. There, those two objects must return the same hash code. For this purpose, the hash code is calculated statically and cached internally. @author Kohsuke KAWAGUCHI

    protected Expression    contentModel;
    protected short            connectorType;
    protected final short    CONNECTOR_UNKNOWN = -999;
    
    public void childElement( String elementName, short occurence ) {
        Expression exp = processOccurs(
                grammar.namedPatterns.getOrCreate(elementName),
                occurence);
        
        if( connectorType == CONNECTOR_UNKNOWN ) {
            // this must be the first child element within this model group.

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        contentModel = null;
        connectorType = CONNECTOR_UNKNOWN;
    }
    
    public void endModelGroup( short occurence ) {
        Expression exp = processOccurs( contentModel, occurence );
        // pop context
        contentModel = contextStack.exp;
        connectorType = contextStack.connectorType;
        contextStack = contextStack.previous;

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            // the first attribute for this element.
            attList = new java.util.HashMap();
            attributeDecls.put(elementName,attList);
        }
        
        Expression body = createAttributeBody(
            elementName,attributeName,attributeType,enums,
            attributeUse,defaultValue);
    
        AttModel am = new AttModel( body, attributeUse==USE_REQUIRED );
        setDeclaredLocationOf(am);

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        Datatype dt = createDatatype(attributeType);
        
        StringPair str = new StringPair("",attributeType);
        
        if(enums!=null) {
            Expression exp = Expression.nullSet;
            for( int i=0; i<enums.length; i++ )
                exp = grammar.pool.createChoice( exp,
                    grammar.pool.createValue(dt,str,
                        dt.createValue(enums[i],null)));
            return exp;

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     */
    protected ReferenceExp createElementDeclaration( String elementName ) {
        final Map attList = (Map)attributeDecls.get(elementName);
        
        
        Expression contentModel = Expression.epsilon;
        
        if(attList!=null) {
            // create AttributeExps and append it to tag.
            Iterator jtr = attList.keySet().iterator();
            while( jtr.hasNext() ) {
                String attName = (String)jtr.next();
                AttModel model = (AttModel)attList.get(attName);
                        
                // wrap it by AttributeExp.
                Expression exp = grammar.pool.createAttribute(
                    getNameClass(attName,true), model.value );
        
                // apply attribute use.
                // unless USE_REQUIRED, the attribute is optional.
                if( !model.required )

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        if( !startTag.containsAttribute("ref") )
            // existance of @ref must be checked before instanciation of this object.
            throw new Error();
        
        // this this tag has @ref.
        Expression exp = reader.resolveQNameRef(
            startTag, "ref",
            new XMLSchemaReader.RefResolver() {
                public ReferenceContainer get( XMLSchemaSchema g ) {
                    return g.elementDecls;
                }

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     * @return
     *        An expression that corresponds to the choice of all
     *        element declarations. This will be used to implement "ANY".
     */
    protected Expression createElementDeclarations() {
        Expression allExp = Expression.nullSet;
        
        // create declarations
        Iterator itr = elementDecls.keySet().iterator();
        while( itr.hasNext() ) {
            Expression exp = createElementDeclaration( (String)itr.next() );
            allExp = grammar.pool.createChoice( allExp, exp );
        }
        
        return allExp;
    }

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    }
    
    public void endDTD() throws SAXException {
        // perform final wrap-up.
        
        final Expression allExp = createElementDeclarations();
        
        
        // set this allExp as the content model of "all" hedgeRule.
        // this special hedgeRule is used to implement ANY content model,
        // and this hedgeRule is also exported.

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public abstract class ExpressionState extends SimpleState
{
    protected void endSelf()
    {
        // creates a expression, then calls a hook of reader,
        Expression exp = reader.interceptExpression( this, makeExpression() );
        
        if( parentState!=null )
            // then finally pass it to the parent
            ((ExpressionOwner)parentState).onEndChild(exp);

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        final String combine = startTag.getCollapsedAttribute("combine");
        
        exp = callInterceptExpression(exp);
        
        // combine two patterns
        Expression newexp = doCombine( ref, exp, combine );
        if( newexp==null )
            reader.reportError( TREXBaseReader.ERR_BAD_COMBINE, combine );
            // recover by ignoring this definition
        else
            ref.exp = newexp;

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