LCOV - lcov.info - /usr/include/tagcoll-2.0.11/tagcoll/diskindex/int.h

LTP GCOV extension - code coverage report
Current view: | directory - usr/include/tagcoll-2.0.11/tagcoll/diskindex - int.h
Test: | lcov.info
Date: | 2008-08-14 |  | Instrumented lines: | 11
Code covered: | 90.9 % |  | Executed lines: | 10

           1                 : #ifndef TAGCOLL_DISKINDEX_INT_H
           2                 : #define TAGCOLL_DISKINDEX_INT_H
           3                 :
           4                 : /** \file
           5                 :  * Fast index for tag data, based on integer indexes
           6                 :  */
           7                 :
           8                 : /*
           9                 :  * Copyright (C) 2006  Enrico Zini <enrico@debian.org>
          10                 :  *
          11                 :  * This program is free software; you can redistribute it and/or modify
          12                 :  * it under the terms of the GNU General Public License as published by
          13                 :  * the Free Software Foundation; either version 2 of the License, or
          14                 :  * (at your option) any later version.
          15                 :  *
          16                 :  * This program is distributed in the hope that it will be useful,
          17                 :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
          18                 :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
          19                 :  * GNU General Public License for more details.
          20                 :  *
          21                 :  * You should have received a copy of the GNU General Public License
          22                 :  * along with this program; if not, write to the Free Software
          23                 :  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
          24                 :  */
          25                 :
          26                 : #include <tagcoll/diskindex/mmap.h>
          27                 : #include <vector>
          28                 : #include <set>
          29                 :
          30                 : namespace tagcoll {
          31                 : namespace diskindex {
          32                 :
          33                 : /**
          34                 :  * MMap-based index of a -> [x1, x2, x3] mappings
          35                 :  *
          36                 :  * The layout is:
          37                 :  *
          38                 :  * [offset of mapping for item 0, offset of mapping for item 1...]
          39                 :  * [size of array][sorted array of ints pointed by index 0]
          40                 :  * [size of array][sorted array of ints pointed by index 1]
          41                 :  * [size of array][sorted array of ints pointed by index 2]
          42                 :  * [...]
          43                 :  * [number of items in the mapping]
          44                 :  *
          45                 :  * This allows fast lookups, as well as fast lookups of unions or intersections
          46                 :  * of mapped arrays.
          47                 :  *
          48                 :  * The number of items for an ID not present in the index is assumed to be 0.
          49                 :  */
          50                 : class Int : public MMap
          51                 : {
          52                 : protected:
          53          274890 :         inline int* buf() const { return (int*)m_buf; }
          54          274890 :         inline size_t ofs(int val) const { return buf()[val]; }
          55                 :
          56                 : public:
          57              20 :         Int() {}
          58                 :         Int(const MasterMMap& master, int idx) : MMap(master, idx) {}
          59                 :
          60                 :         const int* data(int val) const { return (val >= 0 && (unsigned)val < size()) ? buf() + ofs(val) + 1 : 0; }
          61               0 :         size_t size(int val) const { return (val >= 0 && (unsigned)val < size()) ? buf()[ofs(val)] : 0; }
          62          274893 :         size_t size() const { return m_buf ? ofs(0) : 0; }
          63                 : };
          64                 :
          65                 : /**
          66                 :  * Creates an on-disk index to use for IntIndex
          67                 :  */
          68                 : class IntIndexer : public MMapIndexer, public std::vector<std::set<int> >
          69               4 : {
          70                 : public:
          71                 :         /// Store the key->val mapping into the indexer
          72          211196 :         void map(unsigned int key, int val)
          73                 :         {
          74          211196 :                 if (size() <= key)
          75           21142 :                         resize(key + 1);
          76          211196 :                 (*this)[key].insert(val);
          77          211196 :         }
          78                 :
          79                 :         /// Return the size of the encoded index data
          80                 :         virtual int encodedSize() const;
          81                 :
          82                 :         /// Write the index data in the given buffer, which should be at least
          83                 :         /// encodedSize bytes
          84                 :         virtual void encode(char* buf) const;
          85                 : };
          86                 :
          87                 : }
          88                 : }
          89                 :
          90                 : // vim:set ts=4 sw=4:
          91                 : #endif

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