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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.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - 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,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */

package com.sun.msv.verifier.regexp;

import com.sun.msv.grammar.AttributeExp;
import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ExpressionCloner;
import com.sun.msv.grammar.ExpressionPool;
import com.sun.msv.grammar.OtherExp;
import com.sun.msv.grammar.ReferenceExp;

/**
 * Non-recursive ReferenceExpRemover with a cache.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public class ContentModelRefExpRemover {
    
//    public static Expression remove( Expression exp, ExpressionPool pool ) {
//        return exp.getExpandedExp(pool);
//    }
    

    // the class that does the actual job.
    private static class Remover extends ExpressionCloner {
        public Remover(ExpressionPool pool) {
            super(pool);
        }

        public Expression onElement(ElementExp exp) {
            return exp;
        }

        public Expression onAttribute(AttributeExp exp) {
            Expression content = exp.exp.visit(this);
            if (content == Expression.nullSet)
                return Expression.nullSet; // this attribute is not allowed
            else
                return pool.createAttribute(exp.nameClass, content);
        }

        public Expression onRef(ReferenceExp exp) {
            return exp.exp.visit(this);
        }

        public Expression onOther(OtherExp exp) {
            return exp.exp.visit(this);
        }
    }
}