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hOOt - full text search engine

, 22 Jun 2013 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
hoot_v1.0-noexe.zip
hoot_v1.0.zip
fastJSON.dll
Hoot
Properties
SampleApp
newifilter
Properties
Settings.settings
hoot_v1.1-noexe.zip
hoot_v1.1.zip
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
Settings.settings
_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
hoot_v1.2-noexe.zip
hoot_v1.2.zip
fastJSON.dll
Settings.settings
hoot_v1.3-noexe.zip
hoot_v1.3.zip
fastJSON.dll
Settings.settings
hoot_v1.4-noexe.zip
hoot_v1.4.zip
fastJSON.dll
Settings.settings
hoot_v1.5-noexe.zip
hoot_v1.5.zip
fastJSON.dll
Settings.settings
hoot_v2.0.zip
fastJSON
MGIndex
Settings.settings
hoot_v2.1.zip
Settings.settings
hoot_v2.2.1.zip
.gitignore
Settings.settings
hoot_v2.2.zip
.gitignore
Settings.settings
sampleapp.exe_v2.2-noexe.zip
sampleapp.exe_v2.2.1-noexe.zip
sampleapp.exe_v2.2.1.zip
Hoot.dll
SampleApp.exe
sampleapp.exe_v2.2.zip
Hoot.dll
SampleApp.exe
sampleapp_exe-noexe.zip
sampleapp_exe.zip
fastJSON.dll
Hoot.dll
SampleApp.exe
sampleapp_exe_v1.1-noexe.zip
sampleapp_exe_v1.1.zip
fastJSON.dll
Hoot.dll
SampleApp.exe
sampleapp_exe_v1.2-noexe.zip
sampleapp_exe_v1.2.zip
fastJSON.dll
Hoot.dll
SampleApp.exe
sampleapp_exe_v1.3-noexe.zip
sampleapp_exe_v1.3.zip
fastJSON.dll
Hoot.dll
SampleApp.exe
sampleapp_exe_v1.4-noexe.zip
sampleapp_exe_v1.4.zip
fastJSON.dll
Hoot.dll
SampleApp.exe
sampleapp_exe_v1.5-noexe.zip
sampleapp_exe_v1.5.zip
fastJSON.dll
Hoot.dll
SampleApp.exe
sampleapp_exe_v2.0-noexe.zip
sampleapp_exe_v2.0.zip
Hoot.dll
SampleApp.exe
sampleapp_exe_v2.1-noexe.zip
sampleapp_exe_v2.1.zip
Hoot.dll
SampleApp.exe
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;

namespace hOOt
{
    public class Document
    {
        public Document()
        {
            DocNumber = -1;
        }
        public Document(string filename, string text)
        {
            FileName = filename;
            Text = text;
            DocNumber = -1;
        }
        public int DocNumber { get; set; }
        [XmlIgnore]
        public string Text { get; set; }
        public string FileName { get; set; }

        public override string ToString()
        {
            return FileName;
        }
    }

    internal class Cache
    {
        public enum OPERATION
        {
            AND,
            OR,
            NOT
        }

        public Cache()
        {
        }

        public bool isLoaded = false;
        public bool isDirty = true;
        public long FileOffset = -1;
        public int LastBitSaveLength = 0;
        private WAHBitArray _bits;

        public void SetBit(int index, bool val)
        {
            if (_bits != null)
                _bits.Set(index, val);
            else
            {
                _bits = new WAHBitArray();
                _bits.Set(index, val);
            }
            isDirty = true;
        }

        public uint[] GetCompressedBits()
        {
            if (_bits != null)
                return _bits.GetCompressed();
            else
                return null;
        }

        public void FreeMemory(bool unload)
        {
            if (_bits != null)
                _bits.FreeMemory();

            if (unload)
            {
                _bits = null;
                isLoaded = false;
            }
        }

        public void SetCompressedBits(uint[] bits)
        {
            _bits = new WAHBitArray(bits);
            LastBitSaveLength = bits.Length;
            isLoaded = true;
            isDirty = false;
        }

        public WAHBitArray Op(WAHBitArray bits, OPERATION op)
        {
            if (_bits == null)
            {
                // should not be here
            }

            if (op == OPERATION.AND)
                return _bits.And(bits);
            else if (op == OPERATION.OR)
                return _bits.Or(bits);
            else
                return _bits.Not();
        }

        public WAHBitArray GetBitmap()
        {
            return _bits;
        }
    }
}

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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 Platinums on CodeProject (13th Jan'12)

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