FileHelperAsyncEngine.cs :  » Persistence-Frameworks » FileHelpers-Library » FileHelpers » C# / CSharp Open Source

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C# / CSharp Open Source » Persistence Frameworks » FileHelpers Library 
FileHelpers Library » FileHelpers » FileHelperAsyncEngine.cs
#undef GENERICS
//#define GENERICS
//#if NET_2_0

#region "   Copyright 2005-07 to Marcos Meli - http://www.marcosmeli.com.ar"

// Errors, suggestions, contributions, send a mail to: marcos@filehelpers.com.

#endregion

using System;
using System.Diagnostics;
using System.Collections;
using System.IO;
using System.Text;

#if GENERICS
using System.Collections.Generic;
#endif

namespace FileHelpers{
  /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/FileHelperAsyncEngine/*'/>
  /// <include file='Examples.xml' path='doc/examples/FileHelperAsyncEngine/*'/>
#if NET_2_0
    [DebuggerDisplay("FileHelperAsyncEngine for type: {RecordType.Name}. ErrorMode: {ErrorManager.ErrorMode.ToString()}. Encoding: {Encoding.EncodingName}")]
#endif
#if ! GENERICS
   public sealed class FileHelperAsyncEngine : 
     EngineBase, IEnumerable, IDisposable
#else
    /// <typeparam name="T">The record type.</typeparam>
    public sealed class FileHelperAsyncEngine<T> : 
    EngineBase, IEnumerable, IDisposable
#endif
    {
    #region "  Constructor  "

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/FileHelperAsyncEngineCtr/*'/>
#if ! GENERICS
    public FileHelperAsyncEngine(Type recordType) 
      : base(recordType)
#else
    public FileHelperAsyncEngine() 
      : base(typeof(T))
#endif
    {
    }

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/FileHelperAsyncEngineCtr/*'/>
    /// <param name="encoding">The encoding used by the Engine.</param>
#if ! GENERICS
    public FileHelperAsyncEngine(Type recordType, Encoding encoding)
      : base(recordType, encoding)
#else
    public FileHelperAsyncEngine(Encoding encoding)
      : base(typeof(T), encoding)
#endif
    {
    }

    #endregion

#if NET_2_0
        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
#endif
        ForwardReader mAsyncReader;
#if NET_2_0
        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
#endif
        TextWriter mAsyncWriter;

    #region "  LastRecord  "

#if ! GENERICS
#if NET_2_0
        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
#endif
        private object mLastRecord;
    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/LastRecord/*'/>
    public object LastRecord
    {
      get { return mLastRecord; }
    }
#else
#if NET_2_0
        [DebuggerBrowsable(DebuggerBrowsableState.Never)]
#endif
    private T mLastRecord;

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/LastRecord/*'/>
    public T LastRecord
    {
      get { return mLastRecord; }
    }
#endif

        #endregion

        #region "  BeginReadStream"

        /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/BeginReadStream/*'/>
    public void BeginReadStream(TextReader reader)
    {
      if (reader == null)
        throw new ArgumentNullException("The TextReader cant be null.");

        ResetFields();
        mHeaderText = String.Empty;
        mFooterText = String.Empty;

        if (mRecordInfo.mIgnoreFirst > 0)
        {
          for (int i = 0; i < mRecordInfo.mIgnoreFirst; i++)
          {
            string temp = reader.ReadLine();
            mLineNumber++;
            if (temp != null)
              mHeaderText += temp + StringHelper.NewLine;
            else
              break;
          }
        }

        mAsyncReader = new ForwardReader(reader, mRecordInfo.mIgnoreLast, mLineNumber);
        mAsyncReader.DiscardForward = true;
    }

    #endregion

    #region "  BeginReadFile  "

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/BeginReadFile/*'/>
    public void BeginReadFile(string fileName)
    {
      BeginReadStream(new StreamReader(fileName, mEncoding, true));
    }

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/BeginReadString/*'/>
    public void BeginReadString(string sourceData)
    {
      if (sourceData == null)
        sourceData = String.Empty;

      BeginReadStream(new StringReader(sourceData));
    }

    #endregion

    #region "  ReadNext  "

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/ReadNext/*'/>
#if ! GENERICS
    public object ReadNext()
#else
    public T ReadNext()
#endif
    {
      if (mAsyncReader == null)
        throw new BadUsageException("Before call ReadNext you must call BeginReadFile or BeginReadStream.");

      ReadNextRecord();

      return mLastRecord;
    }

    private void ReadNextRecord()
    {
      string currentLine = mAsyncReader.ReadNextLine();
      mLineNumber++;

      bool byPass = false;

#if ! GENERICS
      mLastRecord = null;
#else
      mLastRecord = default(T);
#endif
      
      
      LineInfo line = new LineInfo(string.Empty);
      line.mReader = mAsyncReader;
      
      while (true)
      {
        if (currentLine != null)
        {
          try
          {
            mTotalRecords++;
            line.ReLoad(currentLine);

#if ! GENERICS
            mLastRecord = mRecordInfo.StringToRecord(line);
#else
            mLastRecord = (T) mRecordInfo.StringToRecord(line);
#endif

            if (mLastRecord != null)
            {
              byPass = true;
              return;
            }
          }
          catch (Exception ex)
          {
            switch (mErrorManager.ErrorMode)
            {
              case ErrorMode.ThrowException:
                byPass = true;
                throw;
              case ErrorMode.IgnoreAndContinue:
                break;
              case ErrorMode.SaveAndContinue:
                ErrorInfo err = new ErrorInfo();
                err.mLineNumber = mAsyncReader.LineNumber;
                err.mExceptionInfo = ex;
                //              err.mColumnNumber = mColumnNum;
                err.mRecordString = currentLine;

                mErrorManager.AddError(err);
                break;
            }
          }
          finally
          {
            if (byPass == false)
            {
              currentLine = mAsyncReader.ReadNextLine();
              mLineNumber = mAsyncReader.LineNumber;
            }
          }
        }
        else
        {
#if ! GENERICS
          mLastRecord = null;
#else
          mLastRecord = default(T);
#endif


          if (mRecordInfo.mIgnoreLast > 0)
            mFooterText = mAsyncReader.RemainingText;

          try
          {
            mAsyncReader.Close();
            //mAsyncReader = null;
          }
          catch
          {
          }

          return;
        }
      }
    }


    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/ReadNexts/*'/>
#if ! GENERICS
    public object[] ReadNexts(int numberOfRecords)
#else
    public T[] ReadNexts(int numberOfRecords)
#endif
    {
      if (mAsyncReader == null)
        throw new BadUsageException("Before call ReadNext you must call BeginReadFile or BeginReadStream.");

      ArrayList arr = new ArrayList(numberOfRecords);

      for (int i = 0; i < numberOfRecords; i++)
      {
        ReadNextRecord();
        if (mLastRecord != null)
          arr.Add(mLastRecord);
        else
          break;
      }
#if ! GENERICS
      return (object[])
#else
      return (T[])
#endif
              arr.ToArray(RecordType);
    }

    #endregion

    #region "  Close  "

    /// <summary>
    /// Save all the buffered data for write to the disk. 
    /// Useful to long opened async engines that wants to save pending values or for engines used for logging.
    /// </summary>
    public void Flush()
    {
      if (mAsyncWriter != null)
        mAsyncWriter.Flush();
    }
    
    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/Close/*'/>
    public void Close()
    {
      try
      {
        if (mAsyncReader != null)
          mAsyncReader.Close();

        mAsyncReader = null;
      }
      catch
      {}
      
      try
      {
        if (mAsyncWriter != null)
        {
          if (mFooterText != null && mFooterText != string.Empty)
            if (mFooterText.EndsWith(StringHelper.NewLine))
              mAsyncWriter.Write(mFooterText);
            else
              mAsyncWriter.WriteLine(mFooterText);

          mAsyncWriter.Close();
          mAsyncWriter = null;


        }

      }
      catch
      {}
    }

    #endregion

    #region "  BeginWriteStream"

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/BeginWriteStream/*'/>
    public void BeginWriteStream(TextWriter writer)
    {
      if (writer == null)
        throw new ArgumentException("writer", "The TextWriter cant be null.");

        ResetFields();
        mAsyncWriter = writer;
        WriteHeader();
    }

    private void WriteHeader()
    {
      if (mHeaderText != null && mHeaderText != string.Empty)
        if (mHeaderText.EndsWith(StringHelper.NewLine))
          mAsyncWriter.Write(mHeaderText);
        else
          mAsyncWriter.WriteLine(mHeaderText);
    }

    #endregion

    #region "  BeginWriteFile  "

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/BeginWriteFile/*'/>
    public void BeginWriteFile(string fileName)
    {
      BeginWriteStream(new StreamWriter(fileName, false, mEncoding));
    }

    #endregion


    #region "  BeginappendToFile  "

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/BeginAppendToFile/*'/>
    public void BeginAppendToFile(string fileName)
    {
      mAsyncWriter = StreamHelper.CreateFileAppender(fileName, mEncoding, false);
      mHeaderText = String.Empty;
      mFooterText = String.Empty;
    }

    #endregion

    #region "  WriteNext  "

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/WriteNext/*'/>
#if ! GENERICS
    public void WriteNext(object record)
#else
    public void WriteNext(T record)
#endif
    {
      if (mAsyncWriter == null)
        throw new BadUsageException("Before call WriteNext you must call BeginWriteFile or BeginWriteStream.");

      if (record == null)
        throw new BadUsageException("The record to write cant be null.");

      if (RecordType.IsAssignableFrom(record.GetType()) == false)
        throw new BadUsageException("The record must be of type: " + RecordType.Name);

      WriteRecord(record);
    }

#if ! GENERICS
    private void WriteRecord(object record)
#else
    private void WriteRecord(T record)
#endif
    {
      string currentLine = null;

      try
      {
        mLineNumber++;
        mTotalRecords++;

        currentLine = mRecordInfo.RecordToString(record);
        mAsyncWriter.WriteLine(currentLine);
      }
      catch (Exception ex)
      {
        switch (mErrorManager.ErrorMode)
        {
          case ErrorMode.ThrowException:
            throw;
          case ErrorMode.IgnoreAndContinue:
            break;
          case ErrorMode.SaveAndContinue:
            ErrorInfo err = new ErrorInfo();
            err.mLineNumber = mLineNumber;
            err.mExceptionInfo = ex;
            //              err.mColumnNumber = mColumnNum;
            err.mRecordString = currentLine;
            mErrorManager.AddError(err);
            break;
        }
      }

    }

    /// <include file='FileHelperAsyncEngine.docs.xml' path='doc/WriteNexts/*'/>
#if ! GENERICS
    public void WriteNexts(IEnumerable records)
#else
    public void WriteNexts(IEnumerable<T> records)
#endif
    {
      if (mAsyncWriter == null)
        throw new BadUsageException("Before call WriteNext you must call BeginWriteFile or BeginWriteStream.");

      if (records == null)
        throw new ArgumentNullException("The record to write cant be null.");

      bool first = true;
#if ! GENERICS
      foreach (object rec in records)
#else
      foreach (T rec in records)
#endif
      {
        if (first)
        {
          if (RecordType.IsAssignableFrom(rec.GetType()) == false)
            throw new BadUsageException("The record must be of type: " + RecordType.Name);
          first = false;
        }
        
        WriteRecord(rec);
      }

    }

    #endregion


    #region "  IEnumerable implementation  "

        /// <summary>Allows to loop record by record in the engine</summary>
        /// <returns>The enumerator</returns>
        IEnumerator IEnumerable.GetEnumerator()
     {
       if (mAsyncReader == null)
         throw new FileHelpersException("You must call BeginRead before use the engine in a for each loop.");
       
#if ! GENERICS
      return new AsyncEnumerator(this);
#else
        return new AsyncEnumerator<T>(this);
#endif
     }
     
#if ! GENERICS
    private class AsyncEnumerator : IEnumerator
    {
      FileHelperAsyncEngine mEngine;
      public AsyncEnumerator(FileHelperAsyncEngine engine)
#else
    private class AsyncEnumerator<X> : IEnumerator
    {
      FileHelperAsyncEngine<X> mEngine;
      public AsyncEnumerator(FileHelperAsyncEngine<X> engine)
#endif
      {
        mEngine = engine;
      }

      public bool MoveNext()
      {
        object res = mEngine.ReadNext();
        
        if (res == null)
        {
          mEngine.Close();
          return false;
        }

        return true;

      }

      public object Current
      {
        get
        {
          return mEngine.mLastRecord;
        }
      }

      public void Reset()
      {
        // No needed
      }
    }

     
     #endregion

    #region "  IDisposable implementation  "

        /// <summary>Release Resources</summary>
        void IDisposable.Dispose()
     {
      Close();
       GC.SuppressFinalize(this);
     }
     
     /// <summary>Destructor</summary>
    ~FileHelperAsyncEngine()
     {
      Close();
     }

    #endregion

  }
}

//#endif
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