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#ifndef SORTING_H_INCLUDED
#define SORTING_H_INCLUDED
#include "../fileHierarchy.h"
#include "../shared/systemConstants.h"
#include "../synchronization.h"
#include "../shared/staticAssert.h"
namespace FreeFileSync
{
inline
int compareString(const Zstring& stringA, const Zstring& stringB)
{
#ifdef FFS_WIN //Windows does NOT distinguish between upper/lower-case
return stringA.CmpNoCase(stringB);
#elif defined FFS_LINUX //Linux DOES distinguish between upper/lower-case
return stringA.Cmp(stringB);
#endif
}
template <bool ascending>
struct Compare
{
template <class T>
bool isSmallerThan(T a, T b)
{
assert_static(sizeof(T) <= 2 * sizeof(int)); //use for comparing (small) INTEGRAL types only!
return a < b;
}
};
template <>
struct Compare<false>
{
template <class T>
bool isSmallerThan(T a, T b)
{
assert_static(sizeof(T) <= 2 * sizeof(int)); //use for comparing (small) INTEGRAL types only!
return a > b;
}
};
inline
bool stringSmallerThan(const Zstring& stringA, const Zstring& stringB)
{
return compareString(stringA, stringB) < 0;
}
template <bool ascending, SelectedSide side>
inline
bool sortByFileName(const FileSystemObject& a, const FileSystemObject& b)
{
//presort types: first files, then directories then empty rows
if (a.isEmpty<side>())
return false; //empty rows always last
else if (b.isEmpty<side>())
return true; //empty rows always last
if (isDirectoryMapping(a)) //sort directories by relative name
{
if (isDirectoryMapping(b))
return stringSmallerThan(a.getRelativeName<side>(), b.getRelativeName<side>());
else
return false;
}
else
{
if (isDirectoryMapping(b))
return true;
else
return Compare<ascending>().isSmallerThan(
compareString(a.getShortName<side>(), b.getShortName<side>()), 0);
}
}
template <bool ascending, SelectedSide side>
bool sortByRelativeName(const FileSystemObject& a, const FileSystemObject& b)
{
if (a.isEmpty<side>())
return false; //empty rows always last
else if (b.isEmpty<side>())
return true; //empty rows always last
const bool isDirectoryA = isDirectoryMapping(a);
const Zstring relDirNameA = isDirectoryA ?
a.getRelativeName<side>() : //directory
a.getParentRelativeName(); //file
const bool isDirectoryB = isDirectoryMapping(b);
const Zstring relDirNameB = isDirectoryB ?
b.getRelativeName<side>() : //directory
b.getParentRelativeName(); //file
//compare relative names without filenames first
const int rv = compareString(relDirNameA, relDirNameB);
if (rv != 0)
return Compare<ascending>().isSmallerThan(rv, 0);
else //compare the filenames
{
if (isDirectoryB) //directories shall appear before files
return false;
else if (isDirectoryA)
return true;
return stringSmallerThan(a.getShortName<side>(), b.getShortName<side>());
}
}
template <bool ascending, SelectedSide side>
inline
bool sortByFileSize(const FileSystemObject& a, const FileSystemObject& b)
{
if (a.isEmpty<side>())
return false; //empty rows always last
else if (b.isEmpty<side>())
return true; //empty rows always last
const FileMapping* fileObjA = dynamic_cast<const FileMapping*>(&a);
const FileMapping* fileObjB = dynamic_cast<const FileMapping*>(&b);
if (fileObjA == NULL)
return false; //directories last
else if (fileObjB == NULL)
return true; //directories last
//sortAscending shall result in list beginning with largest files first
return Compare<!ascending>().isSmallerThan(fileObjA->getFileSize<side>(), fileObjB->getFileSize<side>());
}
template <bool ascending, SelectedSide side>
inline
bool sortByDate(const FileSystemObject& a, const FileSystemObject& b)
{
if (a.isEmpty<side>())
return false; //empty rows always last
else if (b.isEmpty<side>())
return true; //empty rows always last
const FileMapping* fileObjA = dynamic_cast<const FileMapping*>(&a);
const FileMapping* fileObjB = dynamic_cast<const FileMapping*>(&b);
if (fileObjA == NULL)
return false; //directories last
else if (fileObjB == NULL)
return true; //directories last
return Compare<!ascending>().isSmallerThan(fileObjA->getLastWriteTime<side>(), fileObjB->getLastWriteTime<side>());
}
template <bool ascending>
inline
bool sortByCmpResult(const FileSystemObject& a, const FileSystemObject& b)
{
//presort result: equal shall appear at end of list
if (a.getCategory() == FILE_EQUAL)
return false;
if (b.getCategory() == FILE_EQUAL)
return true;
return Compare<ascending>().isSmallerThan(a.getCategory(), b.getCategory());
}
template <bool ascending>
inline
bool sortBySyncDirection(const FileSystemObject& a, const FileSystemObject& b)
{
return Compare<ascending>().isSmallerThan(a.getSyncOperation(), b.getSyncOperation());
}
}
#endif // SORTING_H_INCLUDED
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