/*
 * Copyright (C) 2009 Google 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:
 * 
 *     * 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 Google Inc. 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 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 WebCString_h
#define WebCString_h

#include "WebCommon.h"

#if WEBKIT_IMPLEMENTATION
namespace WebCore { class CString; }
#else
#include <string>
#endif

namespace WebKit {

    class WebCStringPrivate;

    // A single-byte string container with unspecified encoding.  It is
    // inexpensive to copy a WebCString object.
    //
    // WARNING: It is not safe to pass a WebCString across threads!!!
    //
    class WebCString {
    public:
        ~WebCString() { reset(); }

        WebCString() : m_private(0) { }

        WebCString(const char* data, size_t len) : m_private(0)
        {
            assign(data, len);
        }

        WebCString(const WebCString& s) : m_private(0) { assign(s); }

        WebCString& operator=(const WebCString& s)
        {
            assign(s);
            return *this;
        }

        WEBKIT_API void reset();
        WEBKIT_API void assign(const WebCString&);
        WEBKIT_API void assign(const char* data, size_t len);

        WEBKIT_API size_t length() const;
        WEBKIT_API const char* data() const;

        bool isEmpty() const { return length() == 0; }
        bool isNull() const { return m_private == 0; }

#if WEBKIT_IMPLEMENTATION
        WebCString(const WebCore::CString&);
        WebCString& operator=(const WebCore::CString&);
        operator WebCore::CString() const;
#else
        WebCString(const std::string& s) : m_private(0)
        {
            assign(s.data(), s.length());
        }

        WebCString& operator=(const std::string& s)
        {
            assign(s.data(), s.length());
            return *this;
        }

        operator std::string() const
        {
            size_t len = length();
            return len ? std::string(data(), len) : std::string();
        }
#endif

    private:
        void assign(WebCStringPrivate*);
        WebCStringPrivate* m_private;
    };

} // namespace WebKit

#endif