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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Collections.Generic;
namespace Microsoft.Scripting.Utils {
// Like ReadOnlyCollection<T>: wraps an IDictionary<K, V> in a read-only wrapper
[Serializable]
public sealed class ReadOnlyDictionary<K, V> : IDictionary<K, V> {
// For wrapping non-readonly Keys, Values collections
// Not used for standard dictionaries, which return read-only Keys and Values
private sealed class ReadOnlyWrapper<T> : ICollection<T> {
// no idea why this warning is here
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1823:AvoidUnusedPrivateFields")]
private readonly ICollection<T> _collection;
internal ReadOnlyWrapper(ICollection<T> collection) {
_collection = collection;
}
#region ICollection<T> Members
public void Add(T item) {
throw new NotSupportedException("Collection is read-only.");
}
public void Clear() {
throw new NotSupportedException("Collection is read-only.");
}
public bool Contains(T item) {
return _collection.Contains(item);
}
public void CopyTo(T[] array, int arrayIndex) {
_collection.CopyTo(array, arrayIndex);
}
public int Count {
get { return _collection.Count; }
}
public bool IsReadOnly {
get { return true; }
}
public bool Remove(T item) {
throw new NotSupportedException("Collection is read-only.");
}
#endregion
#region IEnumerable<T> Members
public IEnumerator<T> GetEnumerator() {
return _collection.GetEnumerator();
}
#endregion
#region IEnumerable Members
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
return _collection.GetEnumerator();
}
#endregion
}
private readonly IDictionary<K, V> _dict;
public ReadOnlyDictionary(IDictionary<K, V> dict) {
ReadOnlyDictionary<K, V> rodict = dict as ReadOnlyDictionary<K, V>;
_dict = (rodict != null) ? rodict._dict : dict;
}
#region IDictionary<K,V> Members
public bool ContainsKey(K key) {
return _dict.ContainsKey(key);
}
public ICollection<K> Keys {
get {
ICollection<K> keys = _dict.Keys;
if (!keys.IsReadOnly) {
return new ReadOnlyWrapper<K>(keys);
}
return keys;
}
}
public bool TryGetValue(K key, out V value) {
return _dict.TryGetValue(key, out value);
}
public ICollection<V> Values {
get {
ICollection<V> values = _dict.Values;
if (!values.IsReadOnly) {
return new ReadOnlyWrapper<V>(values);
}
return values;
}
}
public V this[K key] {
get {
return _dict[key];
}
}
void IDictionary<K, V>.Add(K key, V value) {
throw new NotSupportedException("Collection is read-only.");
}
bool IDictionary<K, V>.Remove(K key) {
throw new NotSupportedException("Collection is read-only.");
}
V IDictionary<K, V>.this[K key] {
get {
return _dict[key];
}
set {
throw new NotSupportedException("Collection is read-only.");
}
}
#endregion
#region ICollection<KeyValuePair<K,V>> Members
public bool Contains(KeyValuePair<K, V> item) {
return _dict.Contains(item);
}
public void CopyTo(KeyValuePair<K, V>[] array, int arrayIndex) {
_dict.CopyTo(array, arrayIndex);
}
public int Count {
get { return _dict.Count; }
}
public bool IsReadOnly {
get { return true; }
}
void ICollection<KeyValuePair<K, V>>.Add(KeyValuePair<K, V> item) {
throw new NotSupportedException("Collection is read-only.");
}
void ICollection<KeyValuePair<K, V>>.Clear() {
throw new NotSupportedException("Collection is read-only.");
}
bool ICollection<KeyValuePair<K,V>>.Remove(KeyValuePair<K, V> item) {
throw new NotSupportedException("Collection is read-only.");
}
#endregion
#region IEnumerable<KeyValuePair<K,V>> Members
public IEnumerator<KeyValuePair<K, V>> GetEnumerator() {
return _dict.GetEnumerator();
}
#endregion
#region IEnumerable Members
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
return _dict.GetEnumerator();
}
#endregion
}
}
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