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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmFileTimeCache.h"
#include <string>
#include <unordered_map>
#include <utility>
cmFileTimeCache::cmFileTimeCache() = default;
cmFileTimeCache::~cmFileTimeCache() = default;
bool cmFileTimeCache::Load(std::string const& fileName, cmFileTime& fileTime)
{
// Use the stored time if available.
{
auto fit = this->Cache.find(fileName);
if (fit != this->Cache.end()) {
fileTime = fit->second;
return true;
}
}
// Read file time from OS
if (!fileTime.Load(fileName)) {
return false;
}
// Store file time in cache
this->Cache[fileName] = fileTime;
return true;
}
bool cmFileTimeCache::Remove(std::string const& fileName)
{
return (this->Cache.erase(fileName) != 0);
}
bool cmFileTimeCache::Compare(std::string const& f1, std::string const& f2,
int* result)
{
// Get the modification time for each file.
cmFileTime ft1;
cmFileTime ft2;
if (this->Load(f1, ft1) && this->Load(f2, ft2)) {
// Compare the two modification times.
*result = ft1.Compare(ft2);
return true;
}
// No comparison available. Default to the same time.
*result = 0;
return false;
}
bool cmFileTimeCache::DifferS(std::string const& f1, std::string const& f2)
{
// Get the modification time for each file.
cmFileTime ft1;
cmFileTime ft2;
if (this->Load(f1, ft1) && this->Load(f2, ft2)) {
// Compare the two modification times.
return ft1.DifferS(ft2);
}
// No comparison available. Default to different times.
return true;
}
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