53 lines
1.8 KiB
C++
53 lines
1.8 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_stringifyutils_h__
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#define mozilla_dom_quota_stringifyutils_h__
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#include "mozilla/ThreadLocal.h"
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#include "nsTHashSet.h"
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#include "nsLiteralString.h"
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namespace mozilla {
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// Use these constants for common delimiters. Note that `Stringify` already
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// encloses each call to `DoStringify` with `kStringify[Start/End]Instance`.
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constexpr auto kStringifyDelimiter = "|"_ns;
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constexpr auto kStringifyStartSet = "["_ns;
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constexpr auto kStringifyEndSet = "]"_ns;
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constexpr auto kStringifyStartInstance = "{"_ns;
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constexpr auto kStringifyEndInstance = "}"_ns;
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// A Stringifyable class provides a method `Stringify` that returns a string
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// representation of the class content.
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//
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// It's content is just appended by the override of `DoStringify` but
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// `Stringifyable` ensures that we won't call `DoStringify` twice for the same
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// call and instance. A single `DoStringify` function thus needs not to be
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// aware of "should I `Stringify` the content of this member or not", it can
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// just do it always.
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//
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// Stringifyable does not bloat the object by additional members but uses
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// thread local memory only when needed.
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class Stringifyable {
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public:
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void Stringify(nsACString& aData);
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static void InitTLS();
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private:
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virtual void DoStringify(nsACString& aData) = 0;
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bool IsActive();
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void SetActive(bool aIsActive);
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static MOZ_THREAD_LOCAL(nsTHashSet<Stringifyable*>*)
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sActiveStringifyableInstances;
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};
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} // namespace mozilla
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#endif // mozilla_dom_quota_stringifyutils_h__
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