third_party/blink/renderer/platform/weborigin/kurl_hash.h

/*
 * 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_WEBORIGIN_KURL_HASH_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WEBORIGIN_KURL_HASH_H_

#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"

namespace blink {

// KURLHash doesn't support null KURLs.  get(), contains(), and add() on
// HashMap<KURL,..., KURLHash> cause a null-pointer dereference when passed null
// KURLs.

struct KURLHash {
  STATIC_ONLY(KURLHash);
  static unsigned GetHash(const KURL& key) {
    return key.GetString().Impl()->GetHash();
  }

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

  static const bool safe_to_compare_to_empty_or_deleted = false;
};

}  // namespace blink

namespace WTF {

template <>
struct HashTraits<blink::KURL> : SimpleClassHashTraits<blink::KURL> {
  static bool IsDeletedValue(const blink::KURL& value) {
    return HashTraits<String>::IsDeletedValue(value.GetString());
  }

  static void ConstructDeletedValue(blink::KURL& slot, bool zero_value) {
    HashTraits<String>::ConstructDeletedValue(slot.string_, zero_value);
  }
};

}  // namespace WTF

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WEBORIGIN_KURL_HASH_H_