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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#ifndef mozilla_dom_CacheExpirationTime_h___
#define mozilla_dom_CacheExpirationTime_h___
#include <stdint.h> // uint32_t
#include "mozilla/Assertions.h" // MOZ_ASSERT
#include "prtime.h" // PRTime, PR_USEC_PER_SEC
#include "nsICacheEntry.h" // nsICacheEntry
/*
* The expiration time for sub resource cache.
*/
struct CacheExpirationTime {
private:
uint32_t mTime;
static constexpr uint32_t kAlreadyExpired = 0;
static constexpr uint32_t kNever = nsICacheEntry::NO_EXPIRATION_TIME;
constexpr CacheExpirationTime() : mTime(kNever) {}
explicit constexpr CacheExpirationTime(uint32_t aTime) : mTime(aTime) {}
static uint32_t SecondsFromPRTime(PRTime aTime) {
return uint32_t(int64_t(aTime) / int64_t(PR_USEC_PER_SEC));
}
public:
static constexpr CacheExpirationTime AlreadyExpired() {
return CacheExpirationTime(kAlreadyExpired);
}
static constexpr CacheExpirationTime Never() {
return CacheExpirationTime(kNever);
}
static constexpr CacheExpirationTime ExpireAt(uint32_t aTime) {
return CacheExpirationTime(aTime);
}
bool IsExpired() const {
if (IsNever()) {
return false;
}
return mTime <= SecondsFromPRTime(PR_Now());
}
bool IsNever() const { return mTime == kNever; }
bool IsShorterThan(const CacheExpirationTime& aOther) const {
return mTime < aOther.mTime;
}
void SetMinimum(const CacheExpirationTime& aOther) {
if (aOther.IsNever()) {
return;
}
if (IsNever() || aOther.IsShorterThan(*this)) {
mTime = aOther.mTime;
}
}
};
#endif /* mozilla_dom_CacheExpirationTime_h___ */