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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) 2008-2010 ZenJu (zhnmju123 AT gmx.de) *
// **************************************************************************
//
#ifndef FFS_FILTER_H_INCLUDED
#define FFS_FILTER_H_INCLUDED
#include "../shared/zstring.h"
#include <set>
#include <boost/shared_ptr.hpp>
#include <wx/stream.h>
namespace FreeFileSync
{
//------------------------------------------------------------------
/* class hierarchy:
BaseFilter (interface)
/|\
_________|_____________
| | |
NullFilter NameFilter CombinedFilter
*/
/*
Semantics of BaseFilter:
1. using it creates a NEW folder hierarchy! -> must be respected by <Automatic>-mode!
2. it applies equally to both sides => it always matches either both sides or none! => can be used while traversing a single folder!
*/
class BaseFilter //interface for filtering
{
public:
virtual ~BaseFilter() {}
//filtering
virtual bool passFileFilter(const DefaultChar* relFilename) const = 0;
virtual bool passDirFilter(const DefaultChar* relDirname, bool* subObjMightMatch) const = 0;
//subObjMightMatch: file/dir in subdirectories could(!) match
//note: variable is only set if passDirFilter returns false!
virtual bool isNull() const = 0; //filter is equivalent to NullFilter, but may be technically slower
//comparison
bool operator<(const BaseFilter& other) const;
bool operator==(const BaseFilter& other) const;
bool operator!=(const BaseFilter& other) const;
typedef boost::shared_ptr<const BaseFilter> FilterRef; //always bound by design!
//serialization
void saveFilter(wxOutputStream& stream) const; //serialize derived object
static FilterRef loadFilter(wxInputStream& stream); //CAVEAT!!! adapt this method for each new derivation!!!
private:
virtual Zstring uniqueClassIdentifier() const = 0; //get identifier, used for serialization
virtual void save(wxOutputStream& stream) const = 0; //serialization
virtual bool cmpLessSameType(const BaseFilter& other) const = 0; //typeid(*this) == typeid(other) in this context!
};
class NullFilter : public BaseFilter //no filtering at all
{
public:
static FilterRef load(wxInputStream& stream); //"serial constructor"
virtual bool passFileFilter(const DefaultChar* relFilename) const;
virtual bool passDirFilter(const DefaultChar* relDirname, bool* subObjMightMatch) const;
virtual bool isNull() const;
private:
virtual Zstring uniqueClassIdentifier() const;
virtual void save(wxOutputStream& stream) const {}
virtual bool cmpLessSameType(const BaseFilter& other) const;
};
class NameFilter : public BaseFilter //standard filter by filename
{
public:
NameFilter(const Zstring& includeFilter, const Zstring& excludeFilter);
static FilterRef load(wxInputStream& stream); //"serial constructor"
virtual bool passFileFilter(const DefaultChar* relFilename) const;
virtual bool passDirFilter(const DefaultChar* relDirname, bool* subObjMightMatch) const;
virtual bool isNull() const;
private:
virtual Zstring uniqueClassIdentifier() const;
virtual void save(wxOutputStream& stream) const;
virtual bool cmpLessSameType(const BaseFilter& other) const;
std::set<Zstring> filterFileIn;
std::set<Zstring> filterFolderIn;
std::set<Zstring> filterFileEx;
std::set<Zstring> filterFolderEx;
const Zstring includeFilterTmp; //save constructor arguments for serialization
const Zstring excludeFilterTmp; //
};
class CombinedFilter : public BaseFilter //combine two filters to match if and only if both match
{
public:
CombinedFilter(const FilterRef& first, const FilterRef& second) : first_(first), second_(second) {}
static FilterRef load(wxInputStream& stream); //"serial constructor"
virtual bool passFileFilter(const DefaultChar* relFilename) const;
virtual bool passDirFilter(const DefaultChar* relDirname, bool* subObjMightMatch) const;
virtual bool isNull() const;
private:
virtual Zstring uniqueClassIdentifier() const;
virtual void save(wxOutputStream& stream) const;
virtual bool cmpLessSameType(const BaseFilter& other) const;
const FilterRef first_;
const FilterRef second_;
};
//small helper method: remove Null-filters
BaseFilter::FilterRef combineFilters(const BaseFilter::FilterRef& first,
const BaseFilter::FilterRef& second);
//---------------Inline Implementation---------------------------------------------------
inline
BaseFilter::FilterRef NullFilter::load(wxInputStream& stream) //"serial constructor"
{
return FilterRef(new NullFilter);
}
inline
bool NullFilter::passFileFilter(const DefaultChar* relFilename) const
{
return true;
}
inline
bool NullFilter::passDirFilter(const DefaultChar* relDirname, bool* subObjMightMatch) const
{
assert(subObjMightMatch == NULL || *subObjMightMatch == true); //check correct usage
return true;
}
inline
bool NullFilter::isNull() const
{
return true;
}
inline
bool NullFilter::cmpLessSameType(const BaseFilter& other) const
{
//typeid(*this) == typeid(other) in this context!
assert(typeid(*this) == typeid(other));
return false;
}
inline
Zstring NullFilter::uniqueClassIdentifier() const
{
return DefaultStr("NullFilter");
}
inline
bool CombinedFilter::passFileFilter(const DefaultChar* relFilename) const
{
return first_->passFileFilter(relFilename) && //short-circuit behavior
second_->passFileFilter(relFilename);
}
inline
bool CombinedFilter::passDirFilter(const DefaultChar* relDirname, bool* subObjMightMatch) const
{
return first_->passDirFilter(relDirname, subObjMightMatch) && //short-circuit behavior: subObjMightMatch handled correctly!
second_->passDirFilter(relDirname, subObjMightMatch);
}
inline
bool CombinedFilter::isNull() const
{
return first_->isNull() && second_->isNull();
}
inline
bool CombinedFilter::cmpLessSameType(const BaseFilter& other) const
{
//typeid(*this) == typeid(other) in this context!
assert(typeid(*this) == typeid(other));
const CombinedFilter& otherCombFilt = static_cast<const CombinedFilter&>(other);
if (*first_ != *otherCombFilt.first_)
return *first_ < *otherCombFilt.first_;
return *second_ < *otherCombFilt.second_;
}
inline
Zstring CombinedFilter::uniqueClassIdentifier() const
{
return DefaultStr("CombinedFilter");
}
inline
void CombinedFilter::save(wxOutputStream& stream) const
{
first_->saveFilter(stream);
second_->saveFilter(stream);
}
inline
BaseFilter::FilterRef CombinedFilter::load(wxInputStream& stream) //"constructor"
{
FilterRef first = loadFilter(stream);
FilterRef second = loadFilter(stream);
return combineFilters(first, second);
}
inline
BaseFilter::FilterRef combineFilters(const BaseFilter::FilterRef& first,
const BaseFilter::FilterRef& second)
{
if (first->isNull())
{
if (second->isNull())
return BaseFilter::FilterRef(new NullFilter);
else
return second;
}
else
{
if (second->isNull())
return first;
else
return BaseFilter::FilterRef(new CombinedFilter(first, second));
}
}
}
#endif // FFS_FILTER_H_INCLUDED
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