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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
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 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

package com.sun.msv.reader.xmlschema;

import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ReferenceContainer;
import com.sun.msv.grammar.xmlschema.XMLSchemaSchema;
import com.sun.msv.reader.ExpressionWithoutChildState;

/**
 * used to parse <element > element with ref attribute.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public class ElementRefState extends ExpressionWithoutChildState {

    protected Expression makeExpression() {
        final XMLSchemaReader reader = (XMLSchemaReader)this.reader;
        
        // TODO: what attributes can be used with @ref?
        
        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;
                }
            } );
        if( exp==null )        return Expression.epsilon;    // couldn't resolve QName.
        
        // minOccurs/maxOccurs is processed through interception
        return exp;
    }
}