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/*
 * Copyright (c) 2001-2013 Oracle and/or its affiliates. All rights reserved.
 *
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 * 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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 *     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,
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 */

package com.sun.msv.reader.trex.ng;

import com.sun.msv.grammar.DifferenceNameClass;
import com.sun.msv.grammar.NameClass;
import com.sun.msv.grammar.NamespaceNameClass;
import com.sun.msv.reader.State;
import com.sun.msv.reader.trex.NameClassWithChildState;
import com.sun.msv.util.StartTagInfo;

/**
 * parses <anyName> name class.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public abstract class NGNameState extends NameClassWithChildState {
    
    NGNameState() {
        allowNullChild = true;
    }
    
    protected State createChildState( StartTagInfo tag ) {
        //  tag is allowed only once.
        if( super.nameClass==null && tag.localName.equals("except") )
            return ((RELAXNGReader)reader).getStateFactory().nsExcept(this,tag);
        return null;
    }
    
    protected NameClass castNameClass( NameClass halfCastedNameClass, NameClass newChildNameClass ) {
        // error check is done by the createChildState method.
        return newChildNameClass;
    }
    
    /**
     * performs final wrap-up and returns a fully created NameClass object
     * that represents this element.
     */
    protected NameClass annealNameClass( NameClass nameClass ) {
        NameClass r = getMainNameClass();
        if( nameClass!=null )
            r = new DifferenceNameClass( r, nameClass );
        return r;
    }
    
    /** this method should return the name class that is used as the base. */
    protected abstract NameClass getMainNameClass();
    
    /** Parsing state for <anyName> */
    public static class AnyNameState extends NGNameState {
        protected NameClass getMainNameClass() {
            return NameClass.ALL;
        }
    }
    
    /** Parsing state for <nsName> */
    public static class NsNameState extends NGNameState {
        protected NameClass getMainNameClass() {
            return new NamespaceNameClass( getPropagatedNamespace() );
        }
    }
    
}