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104 lines
2.5 KiB
C++
104 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_quota_usageinfo_h__
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#define mozilla_dom_quota_usageinfo_h__
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#include <cstdint>
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#include <utility>
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#include "mozilla/CheckedInt.h"
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#include "mozilla/Maybe.h"
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namespace mozilla::dom::quota {
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enum struct UsageKind { Database, File };
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namespace detail {
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inline void AddCapped(Maybe<uint64_t>& aValue, const Maybe<uint64_t> aDelta) {
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if (aDelta.isSome()) {
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CheckedUint64 value = aValue.valueOr(0);
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value += aDelta.value();
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aValue = Some(value.isValid() ? value.value() : UINT64_MAX);
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}
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}
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template <UsageKind Kind>
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struct Usage {
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explicit Usage(Maybe<uint64_t> aValue = Nothing{}) : mValue(aValue) {}
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Maybe<uint64_t> GetValue() const { return mValue; }
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Usage& operator+=(const Usage aDelta) {
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AddCapped(mValue, aDelta.mValue);
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return *this;
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}
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Usage operator+(const Usage aDelta) const {
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Usage res = *this;
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res += aDelta;
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return res;
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}
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private:
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Maybe<uint64_t> mValue;
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};
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} // namespace detail
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using DatabaseUsageType = detail::Usage<UsageKind::Database>;
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using FileUsageType = detail::Usage<UsageKind::File>;
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class UsageInfo final {
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public:
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UsageInfo() = default;
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explicit UsageInfo(const DatabaseUsageType aUsage) : mDatabaseUsage(aUsage) {}
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explicit UsageInfo(const FileUsageType aUsage) : mFileUsage(aUsage) {}
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UsageInfo operator+(const UsageInfo& aUsageInfo) {
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UsageInfo res = *this;
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res += aUsageInfo;
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return res;
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}
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UsageInfo& operator+=(const UsageInfo& aUsageInfo) {
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mDatabaseUsage += aUsageInfo.mDatabaseUsage;
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mFileUsage += aUsageInfo.mFileUsage;
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return *this;
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}
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UsageInfo& operator+=(const DatabaseUsageType aUsage) {
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mDatabaseUsage += aUsage;
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return *this;
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}
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UsageInfo& operator+=(const FileUsageType aUsage) {
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mFileUsage += aUsage;
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return *this;
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}
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Maybe<uint64_t> DatabaseUsage() const { return mDatabaseUsage.GetValue(); }
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Maybe<uint64_t> FileUsage() const { return mFileUsage.GetValue(); }
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Maybe<uint64_t> TotalUsage() const {
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Maybe<uint64_t> res = mDatabaseUsage.GetValue();
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detail::AddCapped(res, FileUsage());
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return res;
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}
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private:
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DatabaseUsageType mDatabaseUsage;
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FileUsageType mFileUsage;
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};
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} // namespace mozilla::dom::quota
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#endif // mozilla_dom_quota_usageinfo_h__
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