72 lines
1.7 KiB
C#
72 lines
1.7 KiB
C#
// Copyright 2019 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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namespace Google.Android.AppBundle.Editor.Internal.Utils
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{
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/// <summary>
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/// An empty <see cref="ICollection"/> that cannot be added to.
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/// </summary>
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public class EmptyCollection<T> : ICollection<T>
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{
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public int Count
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{
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get { return 0; }
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}
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public bool IsReadOnly
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{
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get { return true; }
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}
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public IEnumerator<T> GetEnumerator()
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{
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return Enumerable.Empty<T>().GetEnumerator();
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}
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IEnumerator IEnumerable.GetEnumerator()
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{
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return GetEnumerator();
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}
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public bool Contains(T item)
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{
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return false;
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}
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public void Add(T item)
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{
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throw new NotSupportedException();
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}
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public bool Remove(T item)
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{
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throw new NotSupportedException();
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}
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public void Clear()
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{
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// No-op.
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}
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public void CopyTo(T[] array, int arrayIndex)
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{
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// No-op.
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}
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}
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} |