NNTree.hh
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#ifndef NNTREE_HH
#define NNTREE_HH
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFObjectHandle.hh>
#include <iterator>
#include <list>
class NNTreeDetails
{
public:
virtual std::string const& itemsKey() const = 0;
virtual bool keyValid(QPDFObjectHandle) const = 0;
virtual int compareKeys(QPDFObjectHandle, QPDFObjectHandle) const = 0;
};
class NNTreeIterator: public std::iterator<
std::bidirectional_iterator_tag,
std::pair<QPDFObjectHandle, QPDFObjectHandle>,
void,
std::pair<QPDFObjectHandle, QPDFObjectHandle>*,
std::pair<QPDFObjectHandle, QPDFObjectHandle>>
{
friend class NNTreeImpl;
public:
bool valid() const;
NNTreeIterator& operator++();
NNTreeIterator operator++(int)
{
NNTreeIterator t = *this;
++(*this);
return t;
}
NNTreeIterator& operator--();
NNTreeIterator operator--(int)
{
NNTreeIterator t = *this;
--(*this);
return t;
}
reference operator*();
bool operator==(NNTreeIterator const& other) const;
bool operator!=(NNTreeIterator const& other) const
{
return ! operator==(other);
}
private:
class PathElement
{
public:
PathElement(QPDFObjectHandle const& node, int kid_number);
QPDFObjectHandle getNextKid(bool backward);
QPDFObjectHandle node;
int kid_number;
};
NNTreeIterator(NNTreeDetails const& details) :
details(details),
item_number(-1)
{
}
void deepen(QPDFObjectHandle node, bool first);
void setItemNumber(QPDFObjectHandle const& node, int);
void addPathElement(QPDFObjectHandle const& node, int kid_number);
void increment(bool backward);
NNTreeDetails const& details;
std::list<PathElement> path;
QPDFObjectHandle node;
int item_number;
};
class NNTreeImpl
{
public:
typedef NNTreeIterator iterator;
NNTreeImpl(NNTreeDetails const&, QPDF*, QPDFObjectHandle&,
bool auto_repair = true);
iterator begin();
iterator end();
iterator last();
iterator find(QPDFObjectHandle key, bool return_prev_if_not_found = false);
private:
int withinLimits(QPDFObjectHandle key, QPDFObjectHandle node);
int binarySearch(
QPDFObjectHandle key, QPDFObjectHandle items,
int num_items, bool return_prev_if_not_found,
int (NNTreeImpl::*compare)(QPDFObjectHandle& key,
QPDFObjectHandle& node,
int item));
int compareKeyItem(
QPDFObjectHandle& key, QPDFObjectHandle& items, int idx);
int compareKeyKid(
QPDFObjectHandle& key, QPDFObjectHandle& items, int idx);
NNTreeDetails const& details;
QPDFObjectHandle oh;
};
#endif // NNTREE_HH