LuceneIndexer.cs :  » Content-Management-Systems-CMS » Kooboo » Everest » Search » C# / CSharp Open Source

/*
Kooboo is a content management system based on ASP.NET MVC framework. Copyright 2009 Yardi Technology Limited.

This program is free software: you can redistribute it and/or modify it under the terms of the
GNU General Public License version 3 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program.
If not, see http://www.kooboo.com/gpl3/.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Lucene.Net.Documents;
using Lucene.Net.Index;
using Lucene.Net.Store;
using Lucene.Net.Analysis;
using Lucene.Net.Analysis.Standard;

using Everest.Search.Convertor;
using Everest.Search.Configuration;

using Everest.Library;
namespace Everest.Search{
    /// <summary>
    /// Index use lucene
    /// </summary>
    public class LuceneIndexer : IIndexer
    {
        IndexWriter indexWriter;
        IDocumentConvertor convertor;
        string primaryField;

        #region IIndexer Members

        /// <summary>
        /// use the configuration in the search.config
        /// </summary>
        /// <param name="type">The type.</param>
        public void Open(Type type)
        {
            Open(type, string.Empty);
        }
        /// <summary>
        /// Opens the specified type.
        /// </summary>
        /// <param name="type">The type.</param>
        /// <param name="primaryField">The primary field.</param>
        public void Open(Type type, string primaryField)
        {
            Open(type, string.Empty, primaryField, null, false);
        }
        /// <summary>
        /// Adds the document.
        /// priority to use configuration
        /// </summary>
        /// <param name="o">The o.</param>
        public void AddDocument(object o)
        {
            Document document = convertor.ToDocument(o);
            indexWriter.AddDocument(document);

        }

        /// <summary>
        /// Closes this instance.
        /// </summary>
        public void Close()
        {
            indexWriter.Optimize();
            indexWriter.Close();
            indexWriter = null;
        }

        #endregion

        #region IDisposable Members

        /// <summary>
        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
        /// </summary>
        public void Dispose()
        {
            if (indexWriter != null)
            {
                Close();
            }
        }

        #endregion

        #region IIndexer Members

        /// <summary>
        /// priority-of-use the configuration .
        /// </summary>
        /// <param name="type">The type.</param>
        /// <param name="directory">The directory.</param>
        public void Open(Type type, string directory, string primaryKey, IDocumentConvertor documentConvertor, bool create)
        {
            ConfigurationSerivce configService = new ConfigurationSerivce(type, directory, documentConvertor);
            this.Directory = configService.Directory;
            convertor = configService.GetConvertor();
            convertor.SetAnalyzer(configService.Analyzer);
            bool recreate = !System.IO.Directory.Exists(Directory) || System.IO.Directory.GetFiles(Directory).Length == 0 || create;
            indexWriter = new IndexWriter(Directory, configService.Analyzer, recreate);
            this.primaryField = primaryKey;
            if (!string.IsNullOrEmpty(configService.PrimaryKey))
            {
                this.primaryField = configService.PrimaryKey;
            }
        }
        /// <summary>
        /// Updates the document.
        /// delete old document if the document exists
        /// or add it.
        /// </summary>
        /// <param name="o">The o.</param>
        public void UpdateDocument(object o)
        {
            DesignByContract.Require(!string.IsNullOrEmpty(primaryField), Resources.PrimaryFieldRequirdForUpdateDocument);
            Document document = convertor.ToDocument(o);
            DesignByContract.Require(document.GetField(primaryField) != null, string.Format(Resources.FieldNotFound, primaryField));
            Term keyTerm = new Term(primaryField, document.Get(primaryField));
            indexWriter.DeleteDocuments(keyTerm);
            indexWriter.AddDocument(document);
        }

        /// <summary>
        /// Deletes the document.
        /// </summary>
        /// <param name="primaryValue"></param>
        public void DeleteDocument(string primaryValue)
        {
            Term keyTerm = new Term(primaryField, primaryValue);
            indexWriter.DeleteDocuments(keyTerm);
        }

        public string Directory
        {
            get;
            private set;
        }

        #endregion
    }
}