84 lines
3.0 KiB
C++
84 lines
3.0 KiB
C++
/*
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* Copyright (C) 2008-2021 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/HashMap.h>
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#include <wtf/RefCounted.h>
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#include <wtf/text/StringHash.h>
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#include <wtf/text/WTFString.h>
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namespace WebCore {
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// This class uses copy-on-write semantics.
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class StorageMap {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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// Quota size measured in bytes.
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WEBCORE_EXPORT explicit StorageMap(unsigned quotaSize);
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WEBCORE_EXPORT unsigned length() const;
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WEBCORE_EXPORT String key(unsigned index);
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WEBCORE_EXPORT String getItem(const String&) const;
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WEBCORE_EXPORT void setItem(const String& key, const String& value, String& oldValue, bool& quotaException);
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WEBCORE_EXPORT void setItemIgnoringQuota(const String& key, const String& value);
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WEBCORE_EXPORT void removeItem(const String&, String& oldValue);
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WEBCORE_EXPORT void clear();
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WEBCORE_EXPORT bool contains(const String& key) const;
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WEBCORE_EXPORT void importItems(HashMap<String, String>&&);
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const HashMap<String, String>& items() const { return m_impl->map; }
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unsigned quota() const { return m_quotaSize; }
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bool isShared() const { return !m_impl->hasOneRef(); }
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static constexpr unsigned noQuota = std::numeric_limits<unsigned>::max();
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private:
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void invalidateIterator();
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void setIteratorToIndex(unsigned);
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struct Impl : public RefCounted<Impl> {
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static Ref<Impl> create()
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{
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return adoptRef(*new Impl);
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}
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Ref<Impl> copy() const;
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HashMap<String, String> map;
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HashMap<String, String>::iterator iterator { map.end() };
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unsigned iteratorIndex { std::numeric_limits<unsigned>::max() };
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unsigned currentSize { 0 };
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};
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Ref<Impl> m_impl;
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unsigned m_quotaSize { noQuota }; // Measured in bytes.
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};
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} // namespace WebCore
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