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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.Runtime.InteropServices;
using System.Text;

namespace hOOt
{
    internal class SafeDictionary<TKey, TValue>
    {
        private readonly object _Padlock = new object();
        private readonly Dictionary<TKey, TValue> _Dictionary = new Dictionary<TKey, TValue>();

        public SafeDictionary(int capacity, IEqualityComparer<TKey> comp)
        {
            _Dictionary = new Dictionary<TKey, TValue>(capacity, comp);
        }

        public SafeDictionary()
        {
            _Dictionary = new Dictionary<TKey, TValue>();
        }

        public bool TryGetValue(TKey key, out TValue value)
        {
            return _Dictionary.TryGetValue(key, out value);
        }

        public TValue this[TKey key]
        {
            get
            {
                return _Dictionary[key];
            }
            set
            {
                _Dictionary[key] = value;
            }
        }
        public IEnumerator<KeyValuePair<TKey, TValue>> GetEnumerator()
        {
            return ((ICollection<KeyValuePair<TKey, TValue>>)_Dictionary).GetEnumerator();
        }

        public void Add(TKey key, TValue value)
        {
            lock (_Padlock)
            {
                if (_Dictionary.ContainsKey(key) == false)
                    _Dictionary.Add(key, value);
                else
                    _Dictionary[key] = value;
            }
        }
    }

    internal static class FastDateTime
    {
        public static TimeSpan LocalUtcOffset;

        public static DateTime Now
        {
            get { return DateTime.UtcNow + LocalUtcOffset; }
        }

        static FastDateTime()
        {
            LocalUtcOffset = TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now);
        }
    }

    internal static class Helper
    {
        internal static unsafe int ToInt32(byte[] value, int startIndex, bool reverse)
        {
            if (reverse)
                Array.Reverse(value, startIndex, 4);

            return ToInt32(value, startIndex);
        }

        internal static unsafe int ToInt32(byte[] value, int startIndex)
        {
            fixed (byte* numRef = &(value[startIndex]))
            {
                return *((int*)numRef);
            }
        }

        internal static unsafe long ToInt64(byte[] value, int startIndex, bool reverse)
        {
            if (reverse)
                Array.Reverse(value, startIndex, 8);
            return ToInt64(value, startIndex);
        }

        internal static unsafe long ToInt64(byte[] value, int startIndex)
        {
            fixed (byte* numRef = &(value[startIndex]))
            {
                return *(((long*)numRef));
            }
        }

        internal static unsafe short ToInt16(byte[] value, int startIndex, bool reverse)
        {
            if (reverse)
                Array.Reverse(value, startIndex, 2);
            return ToInt16(value, startIndex);
        }

        internal static unsafe short ToInt16(byte[] value, int startIndex)
        {
            fixed (byte* numRef = &(value[startIndex]))
            {
                return *(((short*)numRef));
            }
        }

        internal static unsafe byte[] GetBytes(long num, bool reverse)
        {
            byte[] buffer = new byte[8];
            fixed (byte* numRef = buffer)
            {
                *((long*)numRef) = num;
            }
            if (reverse)
                Array.Reverse(buffer);
            return buffer;
        }

        internal static unsafe byte[] GetBytes(int num, bool reverse)
        {
            byte[] buffer = new byte[4];
            fixed (byte* numRef = buffer)
            {
                *((int*)numRef) = num;
            }
            if (reverse)
                Array.Reverse(buffer);
            return buffer;
        }

        internal static int Compare(bytearr left, bytearr right)
        {
            int lL = left.val.Length;
            int rL = right.val.Length;
            if (lL < rL)
                return -1;
            else if (lL > rL)
                return 1;
            // key len equal
            int len = lL;

            for (int i = 0; i < len; i++)
            {
                int l = left.val[i];
                int r = right.val[i];
                int k = l - r;
                if (k == 0)
                    continue;
                if (k < 0)
                    return -1;
                else
                    return 1;
            }
            return 0;
        }

        internal static byte[] GetBytes(string s)
        {
            return Encoding.UTF8.GetBytes(s);

            //byte[] b = new byte[s.Length];
            //char[] cc = s.ToCharArray();
            //int l = cc.Length;
            //for (int i = 0; i < l; i++)//foreach (char c in s)
            //    b[i] = (byte)cc[i];// c;
            //return b;
        }

        internal static string GetString(byte[] bytes)
        {
            return Encoding.UTF8.GetString(bytes);
            //char[] cc = new char[bytes.Length];
            //int i=0;
            //foreach (byte b in bytes)
            //    cc[i++] = (char)b;

            //return new string(cc);
        }

        internal static string GetString(byte[] buffer, int index, short length)
        {
            return Encoding.UTF8.GetString(buffer, index, length);
            //char[] cc = new char[keylength];

            //for (int i = 0; i < keylength; i++)
            //    cc[i] = (char)buffer[index + i];

            //return new string(cc);
        }
    }
}

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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 Platinums on CodeProject (13th Jan'12)

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