/Collections/Specialized/ObservableHashSet.cs |
@@ -5,6 +5,7 @@ |
/////////////////////////////////////////////////////////////////////////// |
|
using System; |
using System.Threading; |
using System.Collections; |
using System.Collections.Generic; |
using System.Collections.Specialized; |
@@ -21,11 +22,14 @@ |
/// <typeparam name="T">the object type</typeparam> |
public class ObservableHashSet<T> : ICollection<T>, INotifyCollectionChanged, IEnumerable<T> |
{ |
private readonly ReaderWriterLockSlim SyncRoot = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion); |
private readonly HashSet<T> store = new HashSet<T>(); |
|
public ObservableHashSet(HashSet<T> set) |
{ |
SyncRoot.EnterWriteLock(); |
UnionWith(set); |
SyncRoot.ExitWriteLock(); |
} |
|
public ObservableHashSet() |
@@ -34,17 +38,23 @@ |
|
public ObservableHashSet(T item) |
{ |
SyncRoot.EnterWriteLock(); |
Add(item); |
SyncRoot.ExitWriteLock(); |
} |
|
public ObservableHashSet(ObservableHashSet<T> other) |
{ |
SyncRoot.EnterWriteLock(); |
UnionWith(other); |
SyncRoot.ExitWriteLock(); |
} |
|
public ObservableHashSet(IEnumerable<T> list) |
{ |
SyncRoot.EnterWriteLock(); |
UnionWith(list); |
SyncRoot.ExitWriteLock(); |
} |
|
public bool IsVirgin { get; private set; } = true; |
@@ -51,17 +61,25 @@ |
|
public IEnumerator<T> GetEnumerator() |
{ |
return store.GetEnumerator(); |
SyncRoot.EnterReadLock(); |
var enumerator = store.GetEnumerator(); |
SyncRoot.ExitReadLock(); |
return enumerator; |
} |
|
IEnumerator IEnumerable.GetEnumerator() |
{ |
return GetEnumerator(); |
SyncRoot.EnterReadLock(); |
var enumerator = GetEnumerator(); |
SyncRoot.ExitReadLock(); |
return enumerator; |
} |
|
public void Add(T item) |
{ |
SyncRoot.EnterWriteLock(); |
store.Add(item); |
SyncRoot.ExitWriteLock(); |
IsVirgin = false; |
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, item)); |
} |
@@ -68,7 +86,9 @@ |
|
public void Clear() |
{ |
SyncRoot.EnterWriteLock(); |
store.Clear(); |
SyncRoot.ExitWriteLock(); |
if (!IsVirgin) |
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset)); |
IsVirgin = false; |
@@ -76,17 +96,24 @@ |
|
public bool Contains(T item) |
{ |
return store.Contains(item); |
SyncRoot.EnterReadLock(); |
var contains = store.Contains(item); |
SyncRoot.ExitReadLock(); |
return contains; |
} |
|
public void CopyTo(T[] array, int arrayIndex) |
{ |
SyncRoot.EnterReadLock(); |
store.CopyTo(array, arrayIndex); |
SyncRoot.ExitReadLock(); |
} |
|
public bool Remove(T item) |
{ |
SyncRoot.EnterWriteLock(); |
var removed = store.Remove(item); |
SyncRoot.ExitWriteLock(); |
IsVirgin = false; |
if (removed) |
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, item)); |
@@ -102,7 +129,9 @@ |
public void UnionWith(IEnumerable<T> list) |
{ |
var added = new List<T>(list.Except(store)); |
SyncRoot.EnterWriteLock(); |
store.UnionWith(added); |
SyncRoot.ExitWriteLock(); |
if (!IsVirgin && added.Any()) |
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, added)); |
IsVirgin = false; |
@@ -116,7 +145,9 @@ |
public void ExceptWith(IEnumerable<T> list) |
{ |
var removed = new List<T>(list.Intersect(store)); |
SyncRoot.EnterWriteLock(); |
store.ExceptWith(removed); |
SyncRoot.ExitWriteLock(); |
if (!IsVirgin && removed.Any()) |
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, |
removed)); |
@@ -126,7 +157,9 @@ |
public void RemoveWhere(Func<T, bool> func) |
{ |
var removed = new List<T>(store.Where(func)); |
SyncRoot.EnterWriteLock(); |
store.ExceptWith(removed); |
SyncRoot.ExitWriteLock(); |
if (!IsVirgin && removed.Any()) |
OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, |
removed)); |
@@ -135,7 +168,10 @@ |
|
public IEnumerable<T> AsEnumerable() |
{ |
return store.AsEnumerable(); |
SyncRoot.EnterWriteLock(); |
var enumerable = store.AsEnumerable(); |
SyncRoot.ExitWriteLock(); |
return enumerable; |
} |
} |
} |