/*
* 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.
*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
namespace Spring.Util.Generic
{
/// <summary>
/// Miscellaneous generic collection utility methods.
/// </summary>
/// <remarks>
/// Mainly for internal use within the framework.
/// </remarks>
/// <author>Mark Pollack (.NET)</author>
public sealed class CollectionUtils
{
/// <summary>
/// Determines whether the collection contains all the elements in the specified collection.
/// </summary>
/// <param name="targetCollection">The collection to check.</param>
/// <param name="sourceCollection">Collection whose elements would be checked for containment.</param>
/// <returns>true if the target collection contains all the elements of the specified collection.</returns>
public static bool ContainsAll<T>(ICollection<T> targetCollection, ICollection<T> sourceCollection)
{
if (targetCollection == null || sourceCollection == null)
{
throw new ArgumentNullException("Collection cannot be null.");
}
if ( sourceCollection.Count == 0 && targetCollection.Count > 1 )
return true;
IEnumerator sourceCollectionEnumerator = sourceCollection.GetEnumerator();
bool contains = false;
MethodInfo method;
method = targetCollection.GetType().GetMethod("containsAll", BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);
if (method != null)
contains = (bool) method.Invoke(targetCollection, new Object[] {sourceCollection});
else
{
method = targetCollection.GetType().GetMethod("Contains", BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);
if (method == null)
{
throw new InvalidOperationException("Target collection does not implment a Contains() or ContainsAll() method.");
}
while (sourceCollectionEnumerator.MoveNext())
{
if ((contains = (bool) method.Invoke(targetCollection, new Object[] {sourceCollectionEnumerator.Current})) == false)
break;
}
}
return contains;
}
}
}
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