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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
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 *
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 *
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 *
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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
 * 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.grammar;

/**
 * <mixed> of RELAX.
 * 
 * For TREX, this operator is not an essential one. You can use
 * 
 *   <interleave>
 *     <anyString />
 *     ...
 *   </interleave>
 * 
 * 
 * However, by introducing "mixed" as a primitive, 
 * RELAX module can be expressed without using interleave.
 * 
 * Also, mixed makes validation faster.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public final class MixedExp extends UnaryExp {
    MixedExp(Expression exp) {
        super(exp);
    }

    public Object visit(ExpressionVisitor visitor) {
        return visitor.onMixed(this);
    }
    public Expression visit(ExpressionVisitorExpression visitor) {
        return visitor.onMixed(this);
    }
    public boolean visit(ExpressionVisitorBoolean visitor) {
        return visitor.onMixed(this);
    }
    public void visit(ExpressionVisitorVoid visitor) {
        visitor.onMixed(this);
    }

    protected boolean calcEpsilonReducibility() {
        return exp.isEpsilonReducible();
    }

    // serialization support
    private static final long serialVersionUID = 1;
}