#region License
/*
* Copyright 2002-2008 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.Core.TypeConversion;
#endregion
namespace Spring.Expressions.Processors{
/// <summary>
/// Converts all elements in the input list to a given target type.
/// </summary>
/// <author>Erich Eichinger</author>
public class ConversionProcessor : ICollectionProcessor
{
/// <summary>
/// Processes a list of source items and returns a result.
/// </summary>
/// <param name="source">
/// The source list to process.
/// </param>
/// <param name="args">
/// An optional processor arguments array.
/// </param>
/// <returns>
/// The processing result.
/// </returns>
public object Process(ICollection source, object[] args)
{
if (source == null
|| source.Count == 0)
{
return source;
}
Type targetType = typeof(double);
if (args == null || args.Length == 0)
{
throw new ArgumentNullException("args", "convert() processor requires a Type value argument.");
}
else if (args.Length == 1)
{
if (args[0] is Type)
{
targetType = (Type)args[0];
}
else
{
throw new ArgumentException("convert() processor argument must be a Type value.");
}
}
else if (args.Length > 1)
{
throw new ArgumentException("Only a single argument can be specified for a convert() processor.");
}
ArrayList result = new ArrayList();
foreach(object val in source)
{
object newVal = TypeConversionUtils.ConvertValueIfNecessary(targetType, val, null);
result.Add(newVal);
}
return result.ToArray(targetType);
}
}
}
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