interval_tree.h

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#ifndef FCL_INTERVAL_TREE_H
#define FCL_INTERVAL_TREE_H

#include <deque>
#include <limits>

namespace fcl
{

struct SimpleInterval
{
public:
  virtual ~SimpleInterval() {}
  
  virtual void print() {}

  double low, high;
};

class IntervalTreeNode
{
  friend class IntervalTree;
public:
  void print(IntervalTreeNode* left, IntervalTreeNode* right) const;
  
  IntervalTreeNode();

  IntervalTreeNode(SimpleInterval* new_interval);

  ~IntervalTreeNode();

protected:
  SimpleInterval* stored_interval;

  double key;

  double high;

  double max_high;

  bool red;  

  IntervalTreeNode* left;

  IntervalTreeNode* right;

  IntervalTreeNode* parent;
};

struct it_recursion_node;

class IntervalTree
{
public:

  IntervalTree();

  ~IntervalTree();

  void print() const;

  SimpleInterval* deleteNode(IntervalTreeNode* node);

  void deleteNode(SimpleInterval* ivl);

  IntervalTreeNode* insert(SimpleInterval* new_interval);

  IntervalTreeNode* getPredecessor(IntervalTreeNode* node) const;

  IntervalTreeNode* getSuccessor(IntervalTreeNode* node) const;

  std::deque<SimpleInterval*> query(double low, double high);

protected:

  IntervalTreeNode* root;

  IntervalTreeNode* nil;

  void leftRotate(IntervalTreeNode* node);

  void rightRotate(IntervalTreeNode* node);

  void recursiveInsert(IntervalTreeNode* node);

  void recursivePrint(IntervalTreeNode* node) const;

  IntervalTreeNode* recursiveSearch(IntervalTreeNode* node, SimpleInterval* ivl) const;

  void fixupMaxHigh(IntervalTreeNode* node);

  void deleteFixup(IntervalTreeNode* node);

private:
  unsigned int recursion_node_stack_size;
  it_recursion_node* recursion_node_stack;
  unsigned int current_parent;
  unsigned int recursion_node_stack_top;
};

}

#endif