kurlhash.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2008 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 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 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 KURLHash_h
#define KURLHash_h

#include "KURL.h"
#include "PlatformString.h"
#include "StringHash.h"

namespace WebCore {

    struct KURLHash {
        static unsigned hash(const KURL& key)
        {
            return key.string().impl()->hash();
        }

        static bool equal(const KURL& a, const KURL& b)
        {
            return StringHash::equal(a.string(), b.string());
        }

        static const bool safeToCompareToEmptyOrDeleted = false;
    };

} // namespace WebCore

namespace WTF {

    template<> struct HashTraits<WebCore::KURL> : GenericHashTraits<WebCore::KURL> {
        static const bool emptyValueIsZero = true;
        static void constructDeletedValue(WebCore::KURL& slot) { new (&slot) WebCore::KURL(WebCore::String(HashTableDeletedValue)); }
        static bool isDeletedValue(const WebCore::KURL& slot) { return slot.string().isHashTableDeletedValue(); }
    };

} // namespace WTF

#endif // KURLHash_h