#region Apache Notice
/*****************************************************************************
* $Revision: 405046 $
* $LastChangedDate: 2006-05-08 15:21:44 +0200 (lun., 08 mai 2006) $
* $LastChangedBy: gbayon $
*
* iBATIS.NET Data Mapper
* Copyright (C) 2006/2005 - The Apache Software Foundation
*
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
********************************************************************************/
#endregion
#region Imports
using System;
using System.Collections;
using IBatisNet.Common.Utilities.Objects.Members;
using IBatisNet.DataMapper.Configuration.Sql.Dynamic.Elements;
using IBatisNet.Common.Utilities.Objects;
#endregion
namespace IBatisNet.DataMapper.Configuration.Sql.Dynamic.Handlers{
/// <summary>
/// IsEmptyTagHandler represent a isEmpty tag element in a dynamic mapped statement.
/// </summary>
public class IsEmptyTagHandler : ConditionalTagHandler
{
/// <summary>
/// Initializes a new instance of the <see cref="IsEmptyTagHandler"/> class.
/// </summary>
/// <param name="accessorFactory">The accessor factory.</param>
public IsEmptyTagHandler(AccessorFactory accessorFactory)
: base(accessorFactory)
{
}
#region Methods
/// <summary>
///
/// </summary>
/// <param name="ctx"></param>
/// <param name="tag"></param>
/// <param name="parameterObject"></param>
/// <returns></returns>
public override bool IsCondition(SqlTagContext ctx, SqlTag tag, object parameterObject)
{
if (parameterObject == null)
{
return true;
}
else
{
string propertyName = ((BaseTag)tag).Property;
object value = null;
if (propertyName != null && propertyName.Length>0)
{
value = ObjectProbe.GetMemberValue(parameterObject, propertyName, this.AccessorFactory);
}
else
{
value = parameterObject;
}
if (value is ICollection)
{
return ((value == null) || (((ICollection) value).Count< 1));
}
else if (value != null && typeof(Array).IsAssignableFrom(value.GetType())) //value.GetType().IsArray
{
return ((Array) value).GetLength(0) == 0;
}
else
{
return ((value == null) || (System.Convert.ToString(value).Equals("")));
}
}
}
#endregion
}
}
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