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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:
 *
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 *     notice, this list of conditions and the following disclaimer.
 *
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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,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

package com.sun.msv.verifier.regexp;

import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.Expression;
import com.sun.msv.verifier.Acceptor;

/**
 * Acceptor that will be used when only one ElementExp matches
 * the start tag.
 * 
 * @author Kohsuke KAWAGUCHI
 */
public class SimpleAcceptor extends ContentModelAcceptor {
    
    /**
     * the expression that should be used by the parent acceptor
     * once if this acceptor is satisfied.
     * 
     * This field can be null. In that case, the continuation has to be computed.
     */
    public final Expression continuation;
    
    /**
     * ElementExp that accepted the start tag.
     * 
     * This acceptor is verifying the content model of this ElementExp.
     * This value is usually non-null, but can be null when Verifier is
     * recovering from eariler errors.
     * null owner means this acceptor is "synthesized" just for proper error recovery,
     * therefor there is no owner element expression.
     */
    public final ElementExp owner;

    public final Object getOwnerType()    { return owner; }

    public SimpleAcceptor(
        REDocumentDeclaration docDecl,
        Expression combined,
        ElementExp owner,
        Expression continuation )
    {
        super(docDecl,combined,
            // ignore undeclared attributes if we are recovering from errors.
            (owner==null)?true:owner.ignoreUndeclaredAttributes);
        this.continuation    = continuation;
        this.owner            = owner;
    }
    
    public Acceptor createClone() {
        return new SimpleAcceptor( docDecl, getExpression(), owner, continuation );
    }
}