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// -----------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
// -----------------------------------------------------------------------
using System;
using System.ComponentModel.Composition.Primitives;
using System.ComponentModel.Composition.Hosting;
using System.Linq;
using System.Linq.Expressions;
namespace System.ComponentModel.Composition.Factories
{
partial class CatalogFactory
{
public class FilteredCatalog : ComposablePartCatalog, INotifyComposablePartCatalogChanged
{
private readonly ComposablePartCatalog _inner;
private readonly INotifyComposablePartCatalogChanged _innerNotifyChange;
private readonly IQueryable<ComposablePartDefinition> _partsQuery;
public FilteredCatalog(ComposablePartCatalog inner,
Func<ComposablePartDefinition, bool> filter)
{
_inner = inner;
_innerNotifyChange = inner as INotifyComposablePartCatalogChanged;
_partsQuery = inner.Parts.Where(filter).AsQueryable();
}
public override IQueryable<ComposablePartDefinition> Parts
{
get
{
return _partsQuery;
}
}
public event EventHandler<ComposablePartCatalogChangeEventArgs> Changed
{
add
{
if (_innerNotifyChange != null)
_innerNotifyChange.Changed += value;
}
remove
{
if (_innerNotifyChange != null)
_innerNotifyChange.Changed -= value;
}
}
public event EventHandler<ComposablePartCatalogChangeEventArgs> Changing
{
add
{
if (_innerNotifyChange != null)
_innerNotifyChange.Changing += value;
}
remove
{
if (_innerNotifyChange != null)
_innerNotifyChange.Changing -= value;
}
}
}
}
}
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