/*

 * Copyright (C) 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. 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.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

 */

#ifndef IdentifierRep_h

#define IdentifierRep_h

#include <wtf/Assertions.h>

#include <wtf/FastAllocBase.h>

#include <wtf/StringExtras.h>

#include <string.h>

namespace WebCore {

class IdentifierRep : public FastAllocBase {

public:

    static IdentifierRep* get(int);

    static IdentifierRep* get(const char*);

    static bool isValid(IdentifierRep*);

    bool isString() const { return m_isString; }

    int number() const { return m_isString ? 0 : m_value.m_number; }

    const char* string() const { return m_isString ? m_value.m_string : 0; }

private:

    IdentifierRep(int number) 

        : m_isString(false)

    {

        m_value.m_number = number;

    }

    IdentifierRep(const char* name)

        : m_isString(true)

    {

        m_value.m_string = fastStrDup(name);

    }

    ~IdentifierRep()

    {

        // IdentifierReps should never be deleted.

        ASSERT_NOT_REACHED();

    }

    union {

        const char* m_string;

        int m_number;

    } m_value;

    bool m_isString;

};

} // namespace WebCore

#endif // IdentifierRep_h