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hOOt - full text search engine

, 11 Aug 2016 CPOL
Smallest full text search engine (lucene replacement) built from scratch using inverted WAH bitmap index, highly compact storage, operating in database and document modes
fastJSON.dll
Hoot
Properties
SampleApp
newifilter
Properties
fastJSON.dll
_svn
all-wcprops
entries
text-base
AssemblyInfo.cs.svn-base
_svn
all-wcprops
entries
text-base
ComHelper.cs.svn-base
FilterLoader.cs.svn-base
FilterReader.cs.svn-base
IFilter.cs.svn-base
_svn
all-wcprops
entries
text-base
AssemblyInfo.cs.svn-base
Resources.Designer.cs.svn-base
Resources.resx.svn-base
Settings.Designer.cs.svn-base
Settings.settings.svn-base
fastJSON.dll
fastJSON.dll
fastJSON.dll
fastJSON.dll
fastJSON
MGIndex
.gitignore
.gitignore
fastBinaryJSON
LICENSE
README.md
Tests
Properties
Tools
buildversion.exe
buildversion.ncs
LICENSE
README.md
buildversion.exe
buildversion.ncs
Hoot.dll
SampleApp.exe
Hoot.dll
SampleApp.exe
fastJSON.dll
Hoot.dll
SampleApp.exe
fastJSON.dll
Hoot.dll
SampleApp.exe
fastJSON.dll
Hoot.dll
SampleApp.exe
fastJSON.dll
Hoot.dll
SampleApp.exe
fastJSON.dll
Hoot.dll
SampleApp.exe
fastJSON.dll
Hoot.dll
SampleApp.exe
Hoot.dll
SampleApp.exe
Hoot.dll
SampleApp.exe
Hoot.dll
SampleApp.exe
Hoot.dll
SampleApp.exe
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using RaptorDB.Common;

namespace RaptorDB
{
    internal class BoolIndex
    {
        public BoolIndex(string path, string filename)
        {
            // create file
            _filename = filename;
            if (_filename.Contains(".") == false) _filename += ".idx";
            _path = path;
            if (_path.EndsWith(Path.DirectorySeparatorChar.ToString()) == false)
                _path += Path.DirectorySeparatorChar.ToString();

            if (File.Exists(_path + _filename))
                ReadFile();
        }

        private WAHBitArray _bits = new WAHBitArray();
        private string _filename;
        private string _path;
        private object _lock = new object();
        private bool _inMemory = false;

        public WAHBitArray GetBits()
        {
            return _bits.Copy();
        }

        public void Set(object key, int recnum)
        {
            _bits.Set(recnum, (bool)key);
        }

        public void FreeMemory()
        {
            // free memory
            _bits.FreeMemory();
        }

        public void Shutdown()
        {
            // shutdown
            if (_inMemory == false)
                WriteFile();
        }

        public void SaveIndex()
        {
            if (_inMemory == false)
                WriteFile();
        }

        public void InPlaceOR(WAHBitArray left)
        {
            _bits = _bits.Or(left);
        }

        private void WriteFile()
        {
            WAHBitArray.TYPE t;
            uint[] ints = _bits.GetCompressed(out t);
            MemoryStream ms = new MemoryStream();
            BinaryWriter bw = new BinaryWriter(ms);
            bw.Write((byte)t);// write new format with the data type byte
            foreach (var i in ints)
            {
                bw.Write(i);
            }
            File.WriteAllBytes(_path + _filename, ms.ToArray());
        }

        private void ReadFile()
        {
            byte[] b = File.ReadAllBytes(_path + _filename);
            WAHBitArray.TYPE t = WAHBitArray.TYPE.WAH;
            int j = 0;
            if (b.Length % 4 > 0) // new format with the data type byte
            {
                t = (WAHBitArray.TYPE)Enum.ToObject(typeof(WAHBitArray.TYPE), b[0]);
                j = 1;
            }
            List<uint> ints = new List<uint>();
            for (int i = 0; i < b.Length / 4; i++)
            {
                ints.Add((uint)Helper.ToInt32(b, (i * 4) + j));
            }
            _bits = new WAHBitArray(t, ints.ToArray());
        }

        internal void FixSize(int size)
        {
            _bits.Length = size;
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Mehdi Gholam
Architect -
United Kingdom United Kingdom
Mehdi first started programming when he was 8 on BBC+128k machine in 6512 processor language, after various hardware and software changes he eventually came across .net and c# which he has been using since v1.0.
He is formally educated as a system analyst Industrial engineer, but his programming passion continues.

* Mehdi is the 5th person to get 6 out of 7 Platinum's on Code-Project (13th Jan'12)
* Mehdi is the 3rd person to get 7 out of 7 Platinum's on Code-Project (26th Aug'16)

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