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DBFWriter.cs
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DBFWriter.cs
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/*
DBFWriter
Class for defining a DBF structure and addin data to that structure and
finally writing it to an OutputStream.
This file is part of DotNetDBF packege.
original author (javadbf): anil@linuxense.com 2004/03/31
license: LGPL (http://www.gnu.org/copyleft/lesser.html)
ported to C# (DotNetDBF): Jay Tuley <jay+dotnetdbf@tuley.name> 6/28/2007
*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
namespace LinqDBF
{
//public class DBFWriter : DBFBase, IDisposable
public class DBFWriter : DBFReader
{
protected BinaryWriter _BinaryWriter { get; set; }
//private DBFHeader header;
//private Stream writeStream;
//private int recordCount;
//private List<object> v_records = new List<object>();
//private string _dataMemoLoc;
//private Stream _dataMemo;
////private string _nullSymbol;
///// Creates an empty object.
//public DBFWriter()
//{
// header = new DBFHeader();
//}
//#if NET35
// /// Creates a DBFWriter which can append to records to an existing DBF file.
// /// @param dbfFile. The file passed in shouls be a valid DBF file.
// /// @exception Throws DBFException if the passed in file does exist but not a valid DBF file, or if an IO error occurs.
// public DBFWriter(String dbfFile)
// {
// try
// {
// raf =
// File.Open(dbfFile,
// FileMode.OpenOrCreate,
// FileAccess.ReadWrite);
// DataMemoLoc = Path.ChangeExtension(dbfFile, "dbt");
// /* before proceeding check whether the passed in File object
// is an empty/non-existent file or not.
// */
// if (raf.Length == 0)
// {
// header = new DBFHeader();
// return;
// }
// header = new DBFHeader();
// header.Read(new BinaryReader(raf));
// /* position file pointer at the end of the raf */
// raf.Seek(-1, SeekOrigin.End);
// /* to ignore the END_OF_DATA byte at EoF */
// }
// catch (FileNotFoundException e)
// {
// throw new DBFException("Specified file is not found. ", e);
// }
// catch (IOException e)
// {
// throw new DBFException(" while reading header", e);
// }
// recordCount = header.NumberOfRecords;
// }
//#endif
public DBFWriter(string path)
: this(path, FileShare.Read)
{
}
public DBFWriter(string path, FileShare fileShare)
: this(File.Open(path, FileMode.Open, FileAccess.ReadWrite, fileShare), GetMemoStreamByPath(path, fileShare))
{
}
public DBFWriter(Stream streamWithReadWriteAcces, Lazy<Stream> streamForMemo)
: base(streamWithReadWriteAcces, streamForMemo)
{
//writeStream = streamWithWriteAcces;
_BinaryWriter = new BinaryWriter(streamWithReadWriteAcces);
// header = new DBFHeader();
// /* before proceeding check whether the passed in File object
//is an empty/non-existent file or not.
//*/
// if (writeStream.Length == 0)
// {
// return;
// }
// header.Read(new BinaryReader(writeStream));
// /* position file pointer at the end of the raf */
// writeStream.Seek(-1, SeekOrigin.End);
/* to ignore the END_OF_DATA byte at EoF */
//recordCount = header.NumberOfRecords;
}
public byte Signature
{
get { return _Header.Signature; }
set { _Header.Signature = value; }
}
////#if NET35
// public string DataMemoLoc
// {
// get { return _dataMemoLoc; }
// set
// {
// _dataMemoLoc = value;
// _dataMemo?.Close();
// _dataMemo = File.Open(_dataMemoLoc,
// FileMode.OpenOrCreate,
// FileAccess.ReadWrite);
// }
// }
////#endif
//public Stream DataMemo
//{
// get { return _dataMemo; }
// set { _dataMemo = value; }
//}
public byte LanguageDriver
{
set
{
if (_Header.LanguageDriver != 0x00)
{
throw new DBFException("LanguageDriver has already been set");
}
_Header.LanguageDriver = value;
}
}
// public DBFField[] Fields
// {
// get { return header.FieldArray; }
// set
// {
// if (header.FieldArray != null)
// {
// throw new DBFException("Fields has already been set");
// }
// if (value == null || value.Length == 0)
// {
// throw new DBFException("Should have at least one field");
// }
// for (var i = 0; i < value.Length; i++)
// {
// if (value[i] == null)
// {
// throw new DBFException("Field " + (i + 1) + " is null");
// }
// }
// header.FieldArray = value;
// try
// {
// //if (writeStream != null && writeStream.Length == 0)
// if (_BaseStream?.Length == 0)
// {
// /*
//this is a new/non-existent file. So write header before proceeding
//*/
// //header.Write(new BinaryWriter(writeStream));
// header.Write(binaryWriter);
// }
// }
// catch (IOException e)
// {
// throw new DBFException("Error accesing file", e);
// }
// }
// }
//#region IDisposable Members
///// <summary>Performs application-defined tasks associated with freeing, releasing,
///// or resetting unmanaged resources.</summary>
///// <filterpriority>2</filterpriority>
//public override void Dispose()
//{
// Close();
//}
//#endregion
/**
Add a record.
*/
public void WriteRecord(params object[] values)
{
//if (writeStream == null)
//{
// throw new DBFException(
// "Not initialized with file for WriteRecord use, use AddRecord instead");
//}
//AddRecord(values, true);
//AddRecord(values);
Validate(values);
//if (!writeImediately)
//{
// v_records.Add(values);
//}
//else
//{
try
{
//WriteRecord(new BinaryWriter(writeStream), values);
WriteRecord(_BinaryWriter, values);
//recordCount++;
}
catch (IOException e)
{
throw new DBFException(
"Error occured while writing record. ", e);
}
//}
}
public void WriteRecord(DBFRecord record)
{
if (!record.IsDirty())
{
return;
}
//if (writeStream == null)
//{
// throw new DBFException(
// "Not initialized with file for WriteRecord use, use AddRecord instead");
//}
//AddRecord(values, true);
//AddRecord(record.ValueArray);
Validate(record.ValueArray);
//if (!writeImediately)
//{
// v_records.Add(values);
//}
//else
//{
try
{
//WriteRecord(new BinaryWriter(writeStream), values);
WriteRecord(_BinaryWriter, record);
//recordCount++;
}
catch (IOException e)
{
throw new DBFException(
"Error occured while writing record. ", e);
}
//}
}
//public void AddRecord(params object[] values)
//{
// if (writeStream != null)
// {
// throw new DBFException(
// "Appending to a file, requires using Writerecord instead");
// }
// AddRecord(values, false);
//}
private void Validate(object[] values)
{
if (_Header.FieldArray == null)
{
throw new DBFException(
"Fields should be set before adding records");
}
if (values == null)
{
throw new DBFException("Null cannot be added as row");
}
if (values.Length
!= _Header.FieldArray.Length)
{
throw new DBFException(
"Invalid record. Invalid number of fields in row");
}
for (var i = 0; i < _Header.FieldArray.Length; i++)
{
if (values[i] == null)
{
continue;
}
switch (_Header.FieldArray[i].DataType)
{
case NativeDbType.UnicodeChar:
if (!(values[i] is String) && !(values[i] is DBNull))
{
throw new DBFRecordException($"Invalid value for field {i}", i);
}
break;
case NativeDbType.Char:
if (!(values[i] is String) && !(values[i] is DBNull))
{
throw new DBFRecordException($"Invalid value for field {i}", i);
}
break;
case NativeDbType.Logical:
if (!(values[i] is Boolean) && !(values[i] is DBNull))
{
throw new DBFRecordException($"Invalid value for field {i}", i);
}
break;
case NativeDbType.Numeric:
if (!(values[i] is IConvertible) && !(values[i] is DBNull))
{
throw new DBFRecordException($"Invalid value for field {i}", i);
}
break;
case NativeDbType.Date:
if (!(values[i] is DateTime) && !(values[i] is DBNull))
{
throw new DBFRecordException($"Invalid value for field {i}", i);
}
break;
case NativeDbType.Float:
if (!(values[i] is IConvertible) && !(values[i] is DBNull))
{
throw new DBFRecordException($"Invalid value for field {i}", i);
}
break;
case NativeDbType.Memo:
if (!(values[i] is MemoValue) && !(values[i] is DBNull))
{
throw new DBFRecordException($"Invalid value for field {i}", i);
}
break;
}
}
}
////private void AddRecord(object[] values, bool writeImediately)
//private void AddRecord(object[] values)
//{
// Validate(values);
// //if (!writeImediately)
// //{
// // v_records.Add(values);
// //}
// //else
// //{
// try
// {
// //WriteRecord(new BinaryWriter(writeStream), values);
// WriteRecord(binaryWriter, values);
// //recordCount++;
// header.NumberOfRecords++;
// }
// catch (IOException e)
// {
// throw new DBFException(
// "Error occured while writing record. ", e);
// }
// //}
//}
/////Writes the set data to the OutputStream.
//public void Write(Stream tOut)
//{
// try
// {
// var outStream = new BinaryWriter(tOut);
// header.NumberOfRecords = v_records.Count;
// header.Write(outStream);
// /* Now write all the records */
// var t_recCount = v_records.Count;
// for (var i = 0; i < t_recCount; i++)
// {
// /* iterate through records */
// var t_values = (object[])v_records[i];
// WriteRecord(outStream, t_values);
// }
// outStream.Write(DBFFieldType.EndOfData);
// outStream.Flush();
// }
// catch (IOException e)
// {
// throw new DBFException("Error Writing", e);
// }
//}
public override void Close()
{
//header.NumberOfRecords = recordCount;
//if (writeStream != null)
//{
//writeStream.Seek(0, SeekOrigin.Begin);
_BinaryWriter.Seek(0, SeekOrigin.Begin);
//header.Write(new BinaryWriter(writeStream));
_Header.Write(_BinaryWriter);
///* everything is written already. just update the header for record count and the END_OF_DATA mark */
////header.NumberOfRecords = recordCount;
////if (writeStream != null)
////{
////writeStream.Seek(0, SeekOrigin.Begin);
//binaryWriter.Seek(0, SeekOrigin.Begin);
////header.Write(new BinaryWriter(writeStream));
//header.Write(binaryWriter);
////writeStream.Seek(0, SeekOrigin.End);
//binaryWriter.Seek(0, SeekOrigin.Begin);
////writeStream.WriteByte(DBFFieldType.EndOfData);
//binaryWriter.Seek(0, SeekOrigin.End);
//binaryWriter.Write(DBFFieldType.EndOfData);
////#if NET35
// raf.Close();
// _dataMemo?.Close();
////#else
base.Close();
////writeStream.Dispose();
//_BaseStream.Dispose();
////_dataMemo?.Dispose();
//DataMemo?.Dispose();
//#endif
//}
//#if NET35
// if (!String.IsNullOrEmpty(DataMemoLoc))
// {
// DataMemo.Close();
// }
//#endif
}
public void WriteRecords(params DBFRecord[] values)
{
//if (writeStream == null)
//{
// throw new DBFException(
// "Not initialized with file for WriteRecord use, use AddRecord instead");
//}
if (values == null || values.Length <= 0)
{
return;
}
foreach (DBFRecord record in values)
{
Validate(record.ValueArray);
}
//var outStream = new BinaryWriter(writeStream);
foreach (DBFRecord record in values)
{
//writeStream.Seek(record.Position, SeekOrigin.Begin);
_BaseStream.Seek(record.Position, SeekOrigin.Begin);
if (record.IsDelete())
//outStream.Write((byte)'*');
_BinaryWriter.Write((byte)'*');
else
//WriteRecord(outStream, record.ValueArray);
WriteRecord();
}
//outStream.Flush();
_BinaryWriter.Flush();
}
public void AppendRecords(params object[][] values)
{
//if (writeStream == null)
//{
// throw new DBFException(
// "Not initialized with file for WriteRecord use, use AddRecord instead");
//}
if (values == null || values.Length <= 0)
{
return;
}
foreach (object[] record in values)
{
Validate(record);
}
try
{
//var outStream = new BinaryWriter(writeStream);
/* Now write all the records */
var pos = 0;
_BaseStream.Seek(pos - 1, SeekOrigin.End);
var peekChar = _BinaryRead.PeekChar();
while (peekChar == DBFFieldType.EndOfData)
{
_BaseStream.Seek(--pos - 1, SeekOrigin.End);
peekChar = _BinaryRead.PeekChar();
}
_BaseStream.Seek(pos, SeekOrigin.End);
//var pos = _BaseStream.Position;
//int end = _BinaryRead.PeekChar();
var t_recCount = values.Length;
for (var i = 0; i < t_recCount; i++)
{
/* iterate through records */
var t_values = (object[])values[i];
//WriteRecord(outStream, t_values);
WriteRecord(t_values);
_Header.NumberOfRecords++;
}
//outStream.Write(DBFFieldType.EndOfData);
_BinaryWriter.Write(DBFFieldType.EndOfData);
//outStream.Flush();
_BinaryWriter.Flush();
}
catch (IOException e)
{
throw new DBFException("Error Writing", e);
}
}
//private void WriteRecord(BinaryWriter dataOutput, object[] objectArray)
private void WriteRecord(BinaryWriter dataOutput, object[] objectArray)
{
dataOutput.Write((byte)' ');
for (var j = 0; j < _Header.FieldArray.Length; j++)
{
/* iterate throught fields */
switch (_Header.FieldArray[j].DataType)
{
case NativeDbType.UnicodeChar:
var strValueU = (objectArray[j] != null && objectArray[j] != DBNull.Value) ? objectArray[j].ToString() : "";
var buffer = Utils.textPadding(strValueU,
_UCharEncoding,
_Header.FieldArray[j].FieldLength,
Utils.ALIGN_LEFT,
(byte)0x00
);
dataOutput.Write(buffer);
break;
case NativeDbType.Char:
var str_value = (objectArray[j] != null && objectArray[j] != DBNull.Value) ? objectArray[j].ToString() : "";
dataOutput.Write(
Utils.textPadding(str_value,
CharEncoding,
_Header.FieldArray[j].FieldLength
)
);
break;
case NativeDbType.Date:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tDate = (DateTime)objectArray[j];
dataOutput.Write(
CharEncoding.GetBytes(tDate.ToString("yyyyMMdd")));
}
else
{
dataOutput.Write(
Utils.FillArray(new byte[8], DBFFieldType.Space));
}
break;
case NativeDbType.Float:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tDouble = Convert.ToDouble(objectArray[j]);
dataOutput.Write(
Utils.NumericFormating(
tDouble,
CharEncoding,
_Header.FieldArray[j].FieldLength,
_Header.FieldArray[j].DecimalCount
)
);
}
else
{
dataOutput.Write(
Utils.textPadding(
NullSymbol,
CharEncoding,
_Header.FieldArray[j].FieldLength,
Utils.ALIGN_RIGHT
)
);
}
break;
case NativeDbType.Numeric:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tDecimal = Convert.ToDecimal(objectArray[j]);
dataOutput.Write(
Utils.NumericFormating(
tDecimal,
CharEncoding,
_Header.FieldArray[j].FieldLength,
_Header.FieldArray[j].DecimalCount
)
);
}
else
{
dataOutput.Write(
Utils.textPadding(
NullSymbol,
CharEncoding,
_Header.FieldArray[j].FieldLength,
Utils.ALIGN_RIGHT
)
);
}
break;
case NativeDbType.Logical:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
if ((bool)objectArray[j])
{
dataOutput.Write(DBFFieldType.True);
}
else
{
dataOutput.Write(DBFFieldType.False);
}
}
else
{
dataOutput.Write(DBFFieldType.UnknownByte);
}
break;
case NativeDbType.Memo:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tMemoValue = ((MemoValue)objectArray[j]);
tMemoValue.Write(this);
dataOutput.Write(Utils.NumericFormating(tMemoValue.Block, CharEncoding, 10, 0));
}
else
{
dataOutput.Write(
Utils.textPadding("",
CharEncoding,
10
)
);
}
break;
default:
throw new DBFException("Unknown field type "
+ _Header.FieldArray[j].DataType);
}
} /* iterating through the fields */
}
private void WriteRecord(BinaryWriter dataOutput, DBFRecord record)
{
if (!record.IsDirty())
{
return;
}
//var originalPosition = _BaseStream.Position;
_BaseStream.Seek(record.Position, SeekOrigin.Begin);
dataOutput.Write((byte)' ');
for (var j = 0; j < _Header.FieldArray.Length; j++)
{
/* iterate throught fields */
if (!record.IsDirty(j))
{
_BaseStream.Seek(_Header.FieldArray[j].FieldLength, SeekOrigin.Current);
continue;
}
var objectArray = record.ValueArray;
switch (_Header.FieldArray[j].DataType)
{
case NativeDbType.UnicodeChar:
var str_valueU = (objectArray[j] != null && objectArray[j] != DBNull.Value) ? objectArray[j].ToString() : "";
var bufferU = Utils.textPadding(str_valueU,
_UCharEncoding,
_Header.FieldArray[j].FieldLength,
Utils.ALIGN_LEFT,
(byte)0x00
);
dataOutput.Write(bufferU);
break;
case NativeDbType.Char:
var str_value = (objectArray[j] != null && objectArray[j] != DBNull.Value) ? objectArray[j].ToString() : "";
var buffer = Utils.textPadding(str_value,
CharEncoding,
_Header.FieldArray[j].FieldLength
);
dataOutput.Write(buffer);
break;
case NativeDbType.Date:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tDate = (DateTime)objectArray[j];
dataOutput.Write(
CharEncoding.GetBytes(tDate.ToString("yyyyMMdd")));
}
else
{
dataOutput.Write(
Utils.FillArray(new byte[8], DBFFieldType.Space));
}
break;
case NativeDbType.Float:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tDouble = Convert.ToDouble(objectArray[j]);
dataOutput.Write(
Utils.NumericFormating(
tDouble,
CharEncoding,
_Header.FieldArray[j].FieldLength,
_Header.FieldArray[j].DecimalCount
)
);
}
else
{
dataOutput.Write(
Utils.textPadding(
NullSymbol,
CharEncoding,
_Header.FieldArray[j].FieldLength,
Utils.ALIGN_RIGHT
)
);
}
break;
case NativeDbType.Numeric:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tDecimal = Convert.ToDecimal(objectArray[j]);
dataOutput.Write(
Utils.NumericFormating(
tDecimal,
CharEncoding,
_Header.FieldArray[j].FieldLength,
_Header.FieldArray[j].DecimalCount
)
);
}
else
{
dataOutput.Write(
Utils.textPadding(
NullSymbol,
CharEncoding,
_Header.FieldArray[j].FieldLength,
Utils.ALIGN_RIGHT
)
);
}
break;
case NativeDbType.Logical:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
if ((bool)objectArray[j])
{
dataOutput.Write(DBFFieldType.True);
}
else
{
dataOutput.Write(DBFFieldType.False);
}
}
else
{
dataOutput.Write(DBFFieldType.UnknownByte);
}
break;
case NativeDbType.Memo:
if (objectArray[j] != null && objectArray[j] != DBNull.Value)
{
var tMemoValue = ((MemoValue)objectArray[j]);
tMemoValue.Write(this);
dataOutput.Write(Utils.NumericFormating(tMemoValue.Block, CharEncoding, 10, 0));
}
else
{
dataOutput.Write(
Utils.textPadding("",
CharEncoding,
10
)
);
}
break;
default:
throw new DBFException("Unknown field type "
+ _Header.FieldArray[j].DataType);
}
} /* iterating through the fields */
_BinaryWriter.Flush();
//_BaseStream.Seek(originalPosition, SeekOrigin.Begin);
}
//public int Upsert(DBFReader reader, Func<DBFRecord, bool> filter = null, Func<DBFRecord, DBFRecord> updater = null, Func<IEnumerable<object[]>> inserter = null)
//{
// int countUpdate = 0;
// foreach (DBFRecord record in reader.AsEnumerable())
// {
// if (filter == null || filter(record))
// {
// var updateResult = updater(record);
// if (updateResult != null)
// {
// if (updateResult.Deleted == true)
// {
// raf.Seek(record.Position, SeekOrigin.Begin);
// new BinaryWriter(raf).Write((byte) '*');
// }
// else if (updateResult.Dirty == true)
// {
// raf.Seek(record.Position, SeekOrigin.Begin);
// WriteRecord(updateResult.ValueArray);
// }
// }
// }
// }
// if (inserter != null)
// {
// var insertResult = inserter();
// if (insertResult != null)
// {
// foreach (var record in insertResult)
// {
// WriteRecord(record);
// }
// }
// }
// return countUpdate;
//}
}
}