#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;
#endregion
namespace Spring.Objects.Support{
/// <summary>
/// Serves shared state on a by-type basis.
/// </summary>
public class ByTypeSharedStateFactory : AbstractSharedStateFactory
{
private Type[] typeFilter;
/// <summary>
/// Limit object types to be served by this state manager.
/// </summary>
/// <remarks>
/// Only objects assignable to one of the types in this list
/// will be served state by this manager.
/// </remarks>
public Type[] TypeFilter
{
set { typeFilter = value; }
}
/// <summary>
/// Creates a new instance matching all types by default.
/// </summary>
public ByTypeSharedStateFactory()
{}
/// <summary>
/// Creates a new instance matching only specified list of types.
/// </summary>
/// <param name="typeFilter">the list of types to serve.</param>
public ByTypeSharedStateFactory(Type[] typeFilter)
{
this.typeFilter = typeFilter;
}
/// <summary>
/// Indicate, whether the given instance will be served by this provider
/// </summary>
/// <param name="instance">the instance to serve state</param>
/// <param name="name">the name of the instance</param>
/// <returns>
/// a boolean value indicating, whether state shall
/// be resolved for the given instance or not.
/// </returns>
public override bool CanProvideState( object instance, string name )
{
if (instance == null)
return false;
if (typeFilter == null)
return true;
Type instanceType = instance.GetType();
foreach (Type type in typeFilter)
{
if (type.IsAssignableFrom( instanceType ))
return true;
}
return false;
}
/// <summary>
/// Returns the <see cref="Type"/> for the given <paramref name="instance"/>.
/// </summary>
/// <param name="instance">the instance to obtain the key for.</param>
/// <param name="name">the name of the instance (ignored by this provider)</param>
/// <returns>instance.GetType() if it matches the <see cref="TypeFilter"/> list. Null otherwise.</returns>
/// <remarks>
/// This method will only be called if <see cref="CanProvideState"/> returned true previously.
/// </remarks>
protected override object GetKey( object instance, string name )
{
Type key = instance.GetType();
return key;
}
}
}
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