mono/mcs/class/System.Data/System.Data.Common/DataContainer.cs

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;

namespace System.Data.Common
{
	internal abstract class AbstractDataContainer
	{
		#region Fields

		BitArray _nullValues;
		System.Type _type;
		DataColumn _column;

		#endregion //Fields

		#region Properties

		internal abstract object this[int index] {
			get;
			set;
		}

		internal virtual int Capacity {
			get { 
				return (_nullValues != null) ? _nullValues.Count : 0; 
			}
			set { 
				if (_nullValues == null) {
					_nullValues = new BitArray(value);
				}
				else {
					_nullValues.Length = value;
				}
			}
		}

		internal Type Type {
			get {
				return _type;
			}
		}

		protected DataColumn Column {
			get {
				return _column;
			}
		}

		#endregion //Properties

		#region Methods

		internal static AbstractDataContainer CreateInstance(Type type, DataColumn column)
		{
			AbstractDataContainer container;
			switch (Type.GetTypeCode(type)) {
				case TypeCode.Int16 :
					container = new Int16DataContainer();
					break;
				case TypeCode.Int32 : 
					container = new Int32DataContainer();
					break;
				case TypeCode.Int64 :
					container = new Int64DataContainer();
					break;
				case TypeCode.String :
					container = new StringDataContainer();
					break;
				case TypeCode.Boolean:
					container = new BitDataContainer();
					break;
				case TypeCode.Byte :
					container = new ByteDataContainer();
					break;
				case TypeCode.Char :
					container = new CharDataContainer();
					break;
				case TypeCode.Double :
					container = new DoubleDataContainer();
					break;
				case TypeCode.SByte :
					container = new SByteDataContainer();
					break;
				case TypeCode.Single :
					container = new SingleDataContainer();
					break;
				case TypeCode.UInt16 :
					container = new UInt16DataContainer();
					break;
				case TypeCode.UInt32 :
					container = new UInt32DataContainer();
					break;
				case TypeCode.UInt64 :
					container = new UInt64DataContainer();
					break;
				case TypeCode.DateTime :
					container = new DateTimeDataContainer();
					break;
				case TypeCode.Decimal :
					container = new DecimalDataContainer();
					break;
				default :
					container = new ObjectDataContainer();
					break;
			}
			container._type = type;
			container._column = column;
			return container;
		}

		internal bool IsNull(int index)
		{
			return (_nullValues != null) ? _nullValues[index] : true;
		}

		internal void SetNullBit(int index,bool isNull)
		{
			_nullValues[index] = isNull;
		}

		protected void SetNull(int index,bool isNull,bool isDbNull)
		{
			SetNullBit(index,isDbNull);
			// this method must be called after setting the value into value array
			// otherwise the dafault value will be overriden
			if ( isNull ) {
				// set the value to default
				CopyValue(Column.Table.DefaultValuesRowIndex,index);
			}
		}

		internal void FillValues(int fromIndex)
		{
			for(int i=0; i < Capacity; i++) {
				CopyValue(fromIndex,i);
				_nullValues[i] = _nullValues[fromIndex];
			}
		}

		internal virtual void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
		{
			_nullValues[toIndex] = fromContainer._nullValues[fromIndex];
		}

		internal virtual void CopyValue(int fromIndex, int toIndex)
		{
			_nullValues[toIndex] = _nullValues[fromIndex];
		}

		internal virtual void SetItemFromDataRecord(int index, IDataRecord record, int field)
		{
			bool isDbNull = record.IsDBNull(field);
			SetNull(index,false,isDbNull);
		}

		protected int CompareNulls(int index1, int index2)
		{
			bool null1 = IsNull(index1);
			bool null2 = IsNull(index2);

			if ( null1 ^ null2 ) {
				return null1 ? -1 : 1;
			}
			else {
				return 0;
			}
		}

		internal abstract int CompareValues(int index1, int index2);

		internal abstract long GetInt64(int index);

		#endregion //Methods

		sealed class Int16DataContainer : AbstractDataContainer
		{
			#region Fields
		
			short[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is short ) {
						SetValue(index,(short)value);
					}
					else {
						SetValue(index,Convert.ToInt16(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new short[value];
					}
					else {
						short[] tmp = new short[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, short value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetInt16Safe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((Int16DataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				short s1 = _values[index1];
				short s2 = _values[index2];

				if ( s1 == 0 || s2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0)
						return cn;
				}

				return s1 - s2;
			}

			internal override long GetInt64(int index)
			{
				return (long) _values[index];
			}

			#endregion //Methods
		}

		sealed class Int32DataContainer : AbstractDataContainer
		{
			#region Fields
		
			int[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is int ) {
						SetValue(index,(int)value);
					}
					else {
						SetValue(index,Convert.ToInt32(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new int[value];
					}
					else {
						int[] tmp = new int[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, int value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetInt32Safe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((Int32DataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				int i1 = _values[index1];
				int i2 = _values[index2];
				
				if (i1 == 0 || i2 == 0) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0)
						return cn;
				}

				if ( i1 <= i2 ) {
					return ( i1 == i2 ) ? 0 : -1;
				}
				return 1;
			}

			internal override long GetInt64(int index)
			{
				return (long) _values[index];
			}

			#endregion //Methods
		}

		sealed class Int64DataContainer : AbstractDataContainer
		{
			#region Fields
		
			long[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is long ) {
						SetValue(index,(long)value);
					}
					else {
						SetValue(index,Convert.ToInt64(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new long[value];
					}
					else {
						long[] tmp = new long[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, long value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetInt64Safe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((Int64DataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				long l1 = _values[index1];
				long l2 = _values[index2];

				if ( l1 == 0 || l2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0) {
						return cn;
					}
				}

				if ( l1 <= l2 ) {
					return ( l1 != l2 ) ? -1 : 0;
				}
				return 1;
			}

			internal override long GetInt64(int index)
			{
				return _values[index];
			}

			#endregion //Methods
		}

		sealed class SingleDataContainer : AbstractDataContainer
		{
			#region Fields
		
			float[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is float ) {
						SetValue(index,(float)value);
					}
					else {
						SetValue(index,Convert.ToSingle(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new float[value];
					}
					else {
						float[] tmp = new float[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, float value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetFloatSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((SingleDataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				float f1 = _values[index1];
				float f2 = _values[index2];

				if ( f1 == 0 || f2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0) {
						return cn;
					}
				}

				if ( f1 <= f2 ) {
					return ( f1 != f2 ) ? -1 : 0;
				}
				return 1;
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
		}

		sealed class DoubleDataContainer : AbstractDataContainer
		{
			#region Fields
		
			double[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is double ) {
						SetValue(index,(double)value);
					}
					else {
						SetValue(index,Convert.ToDouble(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new double[value];
					}
					else {
						double[] tmp = new double[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, double value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetDoubleSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((DoubleDataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				double d1 = _values[index1];
				double d2 = _values[index2];

				if ( d1 == 0 || d2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0) {
						return cn;
					}
				}

				if ( d1 <= d2 ) {
					return ( d1 != d2 ) ? -1 : 0;
				}
				return 1;
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
		}

		sealed class ByteDataContainer : AbstractDataContainer
		{
			#region Fields
		
			byte[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is byte ) {
						SetValue(index,(byte)value);
					}
					else {
						SetValue(index,Convert.ToByte(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new byte[value];
					}
					else {
						byte[] tmp = new byte[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, byte value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetByteSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((ByteDataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				byte b1 = _values[index1];
				byte b2 = _values[index2];

				if ( b1 == 0 || b2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0) {
						return cn;
					}
				}

				return b1 - b2;
			}

			internal override long GetInt64(int index)
			{
				return (long) _values[index];
			}

			#endregion //Methods
		}

		sealed class BitDataContainer : AbstractDataContainer
		{
			#region Fields
		
			bool[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					bool isNull = IsNull(index);
					if (isNull) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,false);
					}
					else if( value is bool ) {
						SetValue(index,(bool)value);
					}
					else {
						SetValue(index,Convert.ToBoolean(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new bool[value];
					}
					else {
						bool[] tmp = new bool[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, bool value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetBooleanSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((BitDataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				bool b1 = _values[index1];
				bool b2 = _values[index2];

				if ( b1 ^ b2 ) {
					return b1 ? 1 : -1;
				}
				
				if ( b1 ) {
					return 0;
				}

				return CompareNulls(index1, index2);	
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
		}

		abstract class AbstractObjectDataContainer : AbstractDataContainer
		{
			#region Fields
		
			object[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) 
						return DBNull.Value;

					return _values[index];
				}
				set {
					SetValue(index,value);
					SetNull(index,value == null,value == DBNull.Value);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new object[value];
					}
					else {
						object[] tmp = new object[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			protected virtual void SetValue(int index, object value)
			{
				if(value == null) {
					value = Column.DefaultValue;
				}
				_values[index] = value;
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((AbstractObjectDataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				object obj1 = _values[index1];
				object obj2 = _values[index2];
				if(obj1 == obj2) 
				{
					return 0;
				}
				else
				{
					int cn = CompareNulls(index1, index2);
					if (cn != 0) 
						return cn;

					if (obj1 is IComparable) 
					{
						try 
						{
							return ((IComparable)obj1).CompareTo(obj2);
						}
						catch 
						{
							//just suppress
						}

						if (obj2 is IComparable) 
						{
							obj2 = Convert.ChangeType(obj2, Type.GetTypeCode(obj1.GetType()));
							return ((IComparable)obj1).CompareTo(obj2);
						}
					}
				}

				return String.Compare(obj1.ToString(), obj2.ToString());
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
	 
		}

		sealed class ObjectDataContainer : AbstractObjectDataContainer
		{
			#region Methods
			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught 
				// in the  caller method
				SetValue(index,record.GetValue(field));
				base.SetItemFromDataRecord(index,record,field);
			}

			protected override void SetValue(int index, object value)
			{
				if(value != null && value != DBNull.Value && !Type.IsAssignableFrom(value.GetType()))
					value = Convert.ChangeType(value, Type);

				base.SetValue(index, value);
			}
			#endregion //Methods
	 
		}

		sealed class DateTimeDataContainer : AbstractObjectDataContainer
		{
			#region Methods
			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught 
				// in the  caller method
				base.SetValue(index,record.GetDateTime(field));
				base.SetItemFromDataRecord(index,record,field);
			}

			protected override void SetValue(int index, object value)
			{
				if (value != null && value != DBNull.Value)
					value = Convert.ToDateTime(value);
				base.SetValue(index, value);
			}
			#endregion //Methods
	 
		}

		sealed class DecimalDataContainer : AbstractObjectDataContainer
		{
			#region Methods
			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetDecimalSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			protected override void SetValue(int index, object value)
			{
				if (value != null && value != DBNull.Value)
					value = Convert.ToDecimal(value);
				base.SetValue(index, value);
			}
			#endregion //Methods
	 
		}

		sealed class StringDataContainer : AbstractObjectDataContainer
		{
			#region Methods

			private void SetValue(int index, string value)
			{
				if (value != null && Column.MaxLength >= 0 && Column.MaxLength < value.Length ) {
					throw new ArgumentException("Cannot set column '" + Column.ColumnName + "' to '" + value + "'. The value violates the MaxLength limit of this column.");
				}
				base.SetValue(index,value);
			}
			
			protected override void SetValue(int index, object value)
			{
				if ( value != null && value != DBNull.Value ) {
					if ( value is string ) {
						SetValue(index, (string) value);
					}
					else {
						SetValue(index, Convert.ToString(value));
					}
					return;
				}

				base.SetValue(index, value);
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught 
				// in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetStringSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override int CompareValues(int index1, int index2)
			{
				bool isNull1 = IsNull(index1);
				bool isNull2 = IsNull(index2);

				if (isNull1) {
					return isNull2 ? 0 : -1;
				}
				else {
					if (isNull2) {
						return 1;
					}
				}
				return String.Compare((string)this[index1], (string)this[index2], !Column.Table.CaseSensitive);
			}

			#endregion //Methods 
		}

		sealed class CharDataContainer : AbstractDataContainer
		{
			#region Fields
		
			char[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,'\0');
					}
					else if( value is char ) {
						SetValue(index,(char)value);
					}
					else {
						SetValue(index,Convert.ToChar(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new char[value];
					}
					else {
						char[] tmp = new char[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, char value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,((ISafeDataRecord)record).GetCharSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((CharDataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				char c1 = _values[index1];
				char c2 = _values[index2];

				if ( c1 == '\0' || c2 == '\0' ) 
				{
					int cn = CompareNulls(index1, index2);
					if (cn != 0) 
						return cn;
				}

				return c1 - c2;
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
		}

		sealed class UInt16DataContainer : AbstractDataContainer
		{
			#region Fields
		
			ushort[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is ushort ) {
						SetValue(index,(ushort)value);
					}
					else {
						SetValue(index,Convert.ToUInt16(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new ushort[value];
					}
					else {
						ushort[] tmp = new ushort[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, ushort value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,(ushort)((ISafeDataRecord)record).GetInt16Safe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((UInt16DataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				ushort s1 = _values[index1];
				ushort s2 = _values[index2];

				if ( s1 == 0 || s2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0)
						return cn;
				}

				return s1 - s2;
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
		}

		sealed class UInt32DataContainer : AbstractDataContainer
		{
			#region Fields
		
			uint[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is uint ) {
						SetValue(index,(uint)value);
					}
					else {
						SetValue(index,Convert.ToUInt32(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new uint[value];
					}
					else {
						uint[] tmp = new uint[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, uint value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,(uint)((ISafeDataRecord)record).GetInt32Safe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((UInt32DataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				uint i1 = _values[index1];
				uint i2 = _values[index2];

				if ( i1 == 0 || i2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0)
						return cn;
				}

				if ( i1 <= i2 ) {
					return ( i1 != i2 ) ? -1 : 0;
				}
				return 1;
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
		}

		sealed class UInt64DataContainer : AbstractDataContainer
		{
			#region Fields
		
			ulong[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is ulong ) {
						SetValue(index,(ulong)value);
					}
					else {
						SetValue(index,Convert.ToUInt64(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new ulong[value];
					}
					else {
						ulong[] tmp = new ulong[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, ulong value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,(ulong)((ISafeDataRecord)record).GetInt64Safe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((UInt64DataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				ulong l1 = _values[index1];
				ulong l2 = _values[index2];

				if ( l1 == 0 || l2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0) {
						return cn;
					}
				}

				if ( l1 <= l2 ) {
					return ( l1 != l2 ) ? -1 : 0;
				}
				return 1;
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToInt64(_values[index]);
			}

			#endregion //Methods
		}


		sealed class SByteDataContainer : AbstractDataContainer
		{
			#region Fields
		
			sbyte[] _values;

			#endregion //Fields

			#region Properties

			internal override object this[int index] {
				get {
					if (IsNull(index)) {
						return DBNull.Value;
					}
					else {
						return _values[index];
					}
				}
				set {
					bool isDbNull = (value ==  DBNull.Value);
					if (value == null || isDbNull) {
						SetValue(index,0);
					}
					else if( value is sbyte ) {
						SetValue(index,(sbyte)value);
					}
					else {
						SetValue(index,Convert.ToSByte(value));
					}
					SetNull(index,value == null,isDbNull);
				}
			}

			internal override int Capacity {
				set {
					base.Capacity = value;
					if (_values == null) {
						_values = new sbyte[value];
					}
					else {
						sbyte[] tmp = new sbyte[value];
						Array.Copy(_values,0,tmp,0,_values.Length);
						_values = tmp;
					}
				}
			}

			#endregion //Properties

			#region Methods
			
			private void SetValue(int index, sbyte value)
			{
				_values[index] = value;
			}

			internal override void SetItemFromDataRecord(int index, IDataRecord record, int field)
			{
				// if exception thrown, it should be caught in the  caller method
				if (record is ISafeDataRecord) {
					SetValue(index,(sbyte)((ISafeDataRecord)record).GetByteSafe(field));
				}
				else {
					this[index] = record.GetValue(field);
				}
				base.SetItemFromDataRecord(index,record,field);
			}

			internal override void CopyValue(int fromIndex, int toIndex)
			{
				base.CopyValue(fromIndex, toIndex);
				_values[toIndex] = _values[fromIndex];
			}

			internal override void CopyValue(AbstractDataContainer fromContainer, int fromIndex, int toIndex)
			{
				base.CopyValue(fromContainer, fromIndex, toIndex);
				_values[toIndex] = ((SByteDataContainer)fromContainer)._values[fromIndex];
			}

			internal override int CompareValues(int index1, int index2)
			{
				sbyte b1 = _values[index1];
				sbyte b2 = _values[index2];

				if ( b1 == 0 || b2 == 0 ) {
					int cn = CompareNulls(index1, index2);
					if (cn != 0) {
						return cn;
					}
				}

				return b1 - b2;
			}

			internal override long GetInt64(int index)
			{
				return Convert.ToSByte(_values[index]);
			}

			#endregion //Methods
		}

	}
}