ListIndex.h

// -*- c++ -*-

#ifndef __LIST_INDEX_H__
#define __LIST_INDEX_H__

// tools
#include "tools/AutoPtr.h"

// storage
#include "storage/Index.h"


class ListIndex : public Index {

public:
    
  ~ListIndex();

  virtual void open(const std::string& filename, ReadWrite readwrite=ReadOnly);

  virtual void close();
    
  virtual Result* addChannel(const std::string& channel);

  virtual Result* findChannel(const std::string& channel);

  virtual NameIterator* iterator();

private:

    stdString filename;

    // List of all the sub-archives.
    // Whenever one is opened because we look
    // for a channel in one or because we list
    // all channels, it stays open for performance.
    // NOTE: If this ever changes, those indices which
    // returned an RTree * must be kept open until this
    // ListIndex is removed.
    // Tried AutoPtr<IndexFile>, but the SubArchInfo is used
    // in a stdList, which requires several copy constructor
    // calls of SubArchInfo, and maintaining the index * myself
    // seemed easier.
    class SubArchInfo
    {
    public:

      SubArchInfo(stdString name) : name(name), index(0) {}
        
      const std::string& getName() const
      {   return name; }
        
      Index *openIndex();
        
      void closeIndex();
        
    private:        
      std::string name;
      Index *index;
    };

    stdList<SubArchInfo> sub_archs;

    // List of all names w/ iterator
    stdList<stdString> names;

    // helper for AVLTree::traverse
    static void name_traverser(const stdString &name, void *self);

    void collectNames();
};


#endif