Mega Code Archive
Finds a value of the given type in the given collection
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#region License
/*
* Copyright 2002-2005 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 System.Reflection;
#endregion
namespace Spring.Util
{
/// <summary>
/// Miscellaneous collection utility methods.
/// </summary>
/// <remarks>
/// Mainly for internal use within the framework.
/// </remarks>
/// <author>Mark Pollack (.NET)</author>
public sealed class CollectionUtils
{
/// <summary>
/// Finds a value of the given type in the given collection.
/// </summary>
/// <param name="collection">The collection to search.</param>
/// <param name="type">The type to look for.</param>
/// <returns>a value of the given type found, or null if none.</returns>
/// <exception cref="ArgumentException">If more than one value of the given type is found</exception>
public static object FindValueOfType(ICollection collection, Type type)
{
Type typeToUse = (type != null ? type : typeof(object));
object val = null;
foreach (object obj in collection)
{
if (typeToUse.IsAssignableFrom(obj.GetType()))
{
if (val != null)
{
throw new ArgumentException("More than one value of type[" + typeToUse.Name + "] found.");
}
val = obj;
}
}
return val;
}
}
}
]]>