#region License
/*
* Copyright 2002-2006 the original author or authors.
*
* 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 Spring.Util;
#endregion
namespace Spring.Dao.Support{
/// <summary>
/// Miscellaneous utility methods for DAO implementations.
/// Useful with any data access technology.
/// </summary>
/// <author>Mark Pollack (.NET)</author>
public class DataAccessUtils
{
#region Constructor (s)
/// <summary>
/// Initializes a new instance of the <see cref="DataAccessUtils"/> class.
/// </summary>
public DataAccessUtils()
{
}
#endregion
#region Methods
public static object RequiredUniqueResultSet(IList results)
{
int size = (results != null ? results.Count : 0);
if (size == 0)
{
throw new EmptyResultDataAccessException(1);
}
if ( ! CollectionUtils.HasUniqueObject(results))
{
throw new IncorrectResultSizeDataAccessException(1, size);
}
IEnumerator enumerator = results.GetEnumerator();
enumerator.MoveNext();
return enumerator.Current;
}
/// <summary>
/// Return a translated exception if this is appropriate, or null if the exception could
/// not be translated.
/// </summary>
/// <param name="rawException">The raw exception we may wish to translate.</param>
/// <param name="pet">The PersistenceExceptionTranslator to use to perform the translation.</param>
/// <returns>A translated exception if translation is possible, or or null if the exception could
/// not be translated.</returns>
public static DataAccessException TranslateIfNecessary(Exception rawException, IPersistenceExceptionTranslator pet)
{
AssertUtils.ArgumentNotNull(pet, "PersistenceExceptionTranslator must not be null");
return pet.TranslateExceptionIfPossible(rawException);
}
#endregion
}
}
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