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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 "cmFileTimeComparison.h"
#include <string>
#include <unordered_map>
#include <utility>
class cmFileTimeComparisonInternal
{
public:
inline bool Load(std::string const& fname, cmFileTime& ftm);
inline bool FileTimeCompare(std::string const& f1, std::string const& f2,
int* result);
bool FileTimesDiffer(std::string const& f1, std::string const& f2);
private:
typedef std::unordered_map<std::string, cmFileTime> FileStatsMap;
FileStatsMap Files;
};
bool cmFileTimeComparisonInternal::Load(std::string const& fname,
cmFileTime& ftm)
{
// Use the stored time if available.
{
auto fit = this->Files.find(fname);
if (fit != this->Files.end()) {
ftm = fit->second;
return true;
}
}
// Read file time from OS
if (!ftm.Load(fname)) {
return false;
}
// Store file time in cache
this->Files[fname] = ftm;
return true;
}
cmFileTimeComparison::cmFileTimeComparison()
{
this->Internals = new cmFileTimeComparisonInternal;
}
cmFileTimeComparison::~cmFileTimeComparison()
{
delete this->Internals;
}
bool cmFileTimeComparison::Load(std::string const& fileName,
cmFileTime& fileTime)
{
return this->Internals->Load(fileName, fileTime);
}
bool cmFileTimeComparison::FileTimeCompare(std::string const& f1,
std::string const& f2, int* result)
{
return this->Internals->FileTimeCompare(f1, f2, result);
}
bool cmFileTimeComparison::FileTimesDiffer(std::string const& f1,
std::string const& f2)
{
return this->Internals->FileTimesDiffer(f1, f2);
}
bool cmFileTimeComparisonInternal::FileTimeCompare(std::string const& f1,
std::string const& f2,
int* result)
{
// Get the modification time for each file.
cmFileTime ft1, 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 cmFileTimeComparisonInternal::FileTimesDiffer(std::string const& f1,
std::string const& f2)
{
// Get the modification time for each file.
cmFileTime ft1, 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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