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/*
* Copyright (c) Tribal Media AB, http://tribalmedia.se/
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * The name of Tribal Media AB may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
using System;
using System.Collections.Generic;
using System.Data.Common;
namespace TribalMedia.Framework.Data
{
public delegate TField ObjectGetAccessor<TObj, TField>(TObj obj);
public delegate void ObjectSetAccessor<TObj, TField>(TObj obj, TField value);
public abstract class BaseFieldMapper
{
private readonly BaseTableMapper m_tableMapper;
private readonly string m_fieldName;
public string FieldName
{
get { return m_fieldName; }
}
protected Type m_valueType;
public Type ValueType
{
get { return m_valueType; }
}
public abstract object GetParamValue(object obj);
public BaseFieldMapper(BaseTableMapper tableMapper, string fieldName, Type valueType)
{
m_fieldName = fieldName;
m_valueType = valueType;
m_tableMapper = tableMapper;
}
public abstract void SetPropertyFromReader(object mapper, BaseDataReader reader);
public void RawAddParam(DbCommand command, List<string> fieldNames, string fieldName, object value)
{
string paramName = m_tableMapper.CreateParamName(fieldName);
fieldNames.Add(fieldName);
DbParameter param = command.CreateParameter();
param.ParameterName = paramName;
param.Value = value;
command.Parameters.Add(param);
}
public virtual void ExpandField<TObj>(TObj obj, DbCommand command, List<string> fieldNames)
{
string fieldName = FieldName;
object value = GetParamValue(obj);
RawAddParam(command, fieldNames, fieldName, m_tableMapper.ConvertToDbType(value));
}
protected virtual object GetValue(BaseDataReader reader)
{
object value;
if (ValueType == typeof(Guid))
{
value = reader.GetGuid(m_fieldName);
}
else if (ValueType == typeof(bool))
{
uint boolVal = reader.GetUShort(m_fieldName);
value = (boolVal == 1);
}
else
if (ValueType == typeof(byte))
{
value = reader.GetByte(m_fieldName);
}
else if (ValueType == typeof(sbyte))
{
value = reader.GetSByte(m_fieldName);
}
else if (ValueType == typeof(ushort))
{
value = reader.GetUShort(m_fieldName);
}
else if (ValueType == typeof(byte[]))
{
value = reader.GetBytes(m_fieldName);
}
else
{
value = reader.Get(m_fieldName);
}
if (value is DBNull)
{
value = default(ValueType);
}
return value;
}
}
public class ObjectField<TObject, TField> : BaseFieldMapper
{
private readonly ObjectGetAccessor<TObject, TField> m_fieldGetAccessor;
private readonly ObjectSetAccessor<TObject, TField> m_fieldSetAccessor;
public override object GetParamValue(object obj)
{
return m_fieldGetAccessor((TObject)obj);
}
public override void SetPropertyFromReader(object obj, BaseDataReader reader)
{
object value;
value = GetValue(reader);
if (value == null)
{
m_fieldSetAccessor((TObject)obj, default(TField));
}
else
{
m_fieldSetAccessor((TObject)obj, (TField)value);
}
}
public ObjectField(BaseTableMapper tableMapper, string fieldName, ObjectGetAccessor<TObject, TField> rowMapperGetAccessor,
ObjectSetAccessor<TObject, TField> rowMapperSetAccessor)
: base(tableMapper, fieldName, typeof(TField))
{
m_fieldGetAccessor = rowMapperGetAccessor;
m_fieldSetAccessor = rowMapperSetAccessor;
}
}
}
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