#region Apache License
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//
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// Licensed to the Apache Software Foundation (ASF) under one or more
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// contributor license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright ownership.
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// The ASF licenses this file to you under the Apache License, Version 2.0
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// (the "License"); you may not use this file except in compliance with
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// the License. You may obtain a copy of the License at
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//
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// http://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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//
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#endregion
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using System;
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using System.Collections;
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namespace log4net.Core
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{
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/// <summary>
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/// A strongly-typed collection of <see cref="Level"/> objects.
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/// </summary>
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/// <author>Nicko Cadell</author>
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public class LevelCollection : ICollection, IList, IEnumerable, ICloneable
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{
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#region Interfaces
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/// <summary>
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/// Supports type-safe iteration over a <see cref="LevelCollection"/>.
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/// </summary>
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public interface ILevelCollectionEnumerator
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{
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/// <summary>
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/// Gets the current element in the collection.
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/// </summary>
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Level Current { get; }
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/// <summary>
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/// Advances the enumerator to the next element in the collection.
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/// </summary>
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/// <returns>
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/// <c>true</c> if the enumerator was successfully advanced to the next element;
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/// <c>false</c> if the enumerator has passed the end of the collection.
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/// </returns>
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/// <exception cref="InvalidOperationException">
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/// The collection was modified after the enumerator was created.
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/// </exception>
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bool MoveNext();
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/// <summary>
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/// Sets the enumerator to its initial position, before the first element in the collection.
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/// </summary>
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void Reset();
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}
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#endregion
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private const int DEFAULT_CAPACITY = 16;
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#region Implementation (data)
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private Level[] m_array;
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private int m_count = 0;
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private int m_version = 0;
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#endregion
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#region Static Wrappers
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/// <summary>
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/// Creates a read-only wrapper for a <c>LevelCollection</c> instance.
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/// </summary>
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/// <param name="list">list to create a readonly wrapper arround</param>
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/// <returns>
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/// A <c>LevelCollection</c> wrapper that is read-only.
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/// </returns>
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public static LevelCollection ReadOnly(LevelCollection list)
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{
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if(list==null) throw new ArgumentNullException("list");
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return new ReadOnlyLevelCollection(list);
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}
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#endregion
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#region Constructors
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/// <summary>
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/// Initializes a new instance of the <c>LevelCollection</c> class
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/// that is empty and has the default initial capacity.
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/// </summary>
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public LevelCollection()
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{
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m_array = new Level[DEFAULT_CAPACITY];
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}
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/// <summary>
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/// Initializes a new instance of the <c>LevelCollection</c> class
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/// that has the specified initial capacity.
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/// </summary>
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/// <param name="capacity">
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/// The number of elements that the new <c>LevelCollection</c> is initially capable of storing.
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/// </param>
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public LevelCollection(int capacity)
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{
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m_array = new Level[capacity];
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}
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/// <summary>
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/// Initializes a new instance of the <c>LevelCollection</c> class
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/// that contains elements copied from the specified <c>LevelCollection</c>.
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/// </summary>
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/// <param name="c">The <c>LevelCollection</c> whose elements are copied to the new collection.</param>
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public LevelCollection(LevelCollection c)
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{
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m_array = new Level[c.Count];
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AddRange(c);
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}
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/// <summary>
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/// Initializes a new instance of the <c>LevelCollection</c> class
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/// that contains elements copied from the specified <see cref="Level"/> array.
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/// </summary>
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/// <param name="a">The <see cref="Level"/> array whose elements are copied to the new list.</param>
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public LevelCollection(Level[] a)
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{
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m_array = new Level[a.Length];
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AddRange(a);
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}
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/// <summary>
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/// Initializes a new instance of the <c>LevelCollection</c> class
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/// that contains elements copied from the specified <see cref="Level"/> collection.
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/// </summary>
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/// <param name="col">The <see cref="Level"/> collection whose elements are copied to the new list.</param>
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public LevelCollection(ICollection col)
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{
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m_array = new Level[col.Count];
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AddRange(col);
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}
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/// <summary>
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/// Type visible only to our subclasses
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/// Used to access protected constructor
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/// </summary>
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protected internal enum Tag
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{
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/// <summary>
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/// A value
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/// </summary>
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Default
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}
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/// <summary>
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/// Allow subclasses to avoid our default constructors
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/// </summary>
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/// <param name="tag"></param>
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protected internal LevelCollection(Tag tag)
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{
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m_array = null;
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}
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#endregion
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#region Operations (type-safe ICollection)
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/// <summary>
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/// Gets the number of elements actually contained in the <c>LevelCollection</c>.
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/// </summary>
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public virtual int Count
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{
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get { return m_count; }
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}
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/// <summary>
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/// Copies the entire <c>LevelCollection</c> to a one-dimensional
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/// <see cref="Level"/> array.
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/// </summary>
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/// <param name="array">The one-dimensional <see cref="Level"/> array to copy to.</param>
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public virtual void CopyTo(Level[] array)
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{
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this.CopyTo(array, 0);
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}
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/// <summary>
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/// Copies the entire <c>LevelCollection</c> to a one-dimensional
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/// <see cref="Level"/> array, starting at the specified index of the target array.
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/// </summary>
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/// <param name="array">The one-dimensional <see cref="Level"/> array to copy to.</param>
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/// <param name="start">The zero-based index in <paramref name="array"/> at which copying begins.</param>
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public virtual void CopyTo(Level[] array, int start)
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{
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if (m_count > array.GetUpperBound(0) + 1 - start)
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{
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throw new System.ArgumentException("Destination array was not long enough.");
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}
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Array.Copy(m_array, 0, array, start, m_count);
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}
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/// <summary>
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/// Gets a value indicating whether access to the collection is synchronized (thread-safe).
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/// </summary>
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/// <value>true if access to the ICollection is synchronized (thread-safe); otherwise, false.</value>
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public virtual bool IsSynchronized
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{
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get { return m_array.IsSynchronized; }
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}
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/// <summary>
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/// Gets an object that can be used to synchronize access to the collection.
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/// </summary>
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public virtual object SyncRoot
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{
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get { return m_array.SyncRoot; }
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}
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#endregion
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#region Operations (type-safe IList)
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/// <summary>
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/// Gets or sets the <see cref="Level"/> at the specified index.
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/// </summary>
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/// <param name="index">The zero-based index of the element to get or set.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <para><paramref name="index"/> is less than zero</para>
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/// <para>-or-</para>
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/// <para><paramref name="index"/> is equal to or greater than <see cref="LevelCollection.Count"/>.</para>
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/// </exception>
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public virtual Level this[int index]
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{
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get
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{
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ValidateIndex(index); // throws
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return m_array[index];
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}
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set
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{
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ValidateIndex(index); // throws
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++m_version;
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m_array[index] = value;
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}
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}
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/// <summary>
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/// Adds a <see cref="Level"/> to the end of the <c>LevelCollection</c>.
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/// </summary>
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/// <param name="item">The <see cref="Level"/> to be added to the end of the <c>LevelCollection</c>.</param>
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/// <returns>The index at which the value has been added.</returns>
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public virtual int Add(Level item)
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{
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if (m_count == m_array.Length)
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{
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EnsureCapacity(m_count + 1);
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}
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m_array[m_count] = item;
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m_version++;
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return m_count++;
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}
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/// <summary>
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/// Removes all elements from the <c>LevelCollection</c>.
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/// </summary>
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public virtual void Clear()
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{
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++m_version;
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m_array = new Level[DEFAULT_CAPACITY];
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m_count = 0;
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}
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/// <summary>
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/// Creates a shallow copy of the <see cref="LevelCollection"/>.
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/// </summary>
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/// <returns>A new <see cref="LevelCollection"/> with a shallow copy of the collection data.</returns>
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public virtual object Clone()
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{
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LevelCollection newCol = new LevelCollection(m_count);
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Array.Copy(m_array, 0, newCol.m_array, 0, m_count);
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newCol.m_count = m_count;
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newCol.m_version = m_version;
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return newCol;
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}
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/// <summary>
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/// Determines whether a given <see cref="Level"/> is in the <c>LevelCollection</c>.
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/// </summary>
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/// <param name="item">The <see cref="Level"/> to check for.</param>
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/// <returns><c>true</c> if <paramref name="item"/> is found in the <c>LevelCollection</c>; otherwise, <c>false</c>.</returns>
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public virtual bool Contains(Level item)
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{
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for (int i=0; i != m_count; ++i)
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{
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if (m_array[i].Equals(item))
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{
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return true;
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}
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}
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return false;
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}
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/// <summary>
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/// Returns the zero-based index of the first occurrence of a <see cref="Level"/>
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/// in the <c>LevelCollection</c>.
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/// </summary>
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/// <param name="item">The <see cref="Level"/> to locate in the <c>LevelCollection</c>.</param>
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/// <returns>
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/// The zero-based index of the first occurrence of <paramref name="item"/>
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/// in the entire <c>LevelCollection</c>, if found; otherwise, -1.
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/// </returns>
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public virtual int IndexOf(Level item)
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{
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for (int i=0; i != m_count; ++i)
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{
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if (m_array[i].Equals(item))
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{
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return i;
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}
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}
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return -1;
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}
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/// <summary>
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/// Inserts an element into the <c>LevelCollection</c> at the specified index.
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/// </summary>
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/// <param name="index">The zero-based index at which <paramref name="item"/> should be inserted.</param>
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/// <param name="item">The <see cref="Level"/> to insert.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <para><paramref name="index"/> is less than zero</para>
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/// <para>-or-</para>
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/// <para><paramref name="index"/> is equal to or greater than <see cref="LevelCollection.Count"/>.</para>
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/// </exception>
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public virtual void Insert(int index, Level item)
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{
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ValidateIndex(index, true); // throws
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if (m_count == m_array.Length)
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{
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EnsureCapacity(m_count + 1);
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}
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if (index < m_count)
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{
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Array.Copy(m_array, index, m_array, index + 1, m_count - index);
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}
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m_array[index] = item;
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m_count++;
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m_version++;
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}
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/// <summary>
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/// Removes the first occurrence of a specific <see cref="Level"/> from the <c>LevelCollection</c>.
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/// </summary>
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/// <param name="item">The <see cref="Level"/> to remove from the <c>LevelCollection</c>.</param>
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/// <exception cref="ArgumentException">
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/// The specified <see cref="Level"/> was not found in the <c>LevelCollection</c>.
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/// </exception>
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public virtual void Remove(Level item)
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{
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int i = IndexOf(item);
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if (i < 0)
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{
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throw new System.ArgumentException("Cannot remove the specified item because it was not found in the specified Collection.");
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}
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++m_version;
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RemoveAt(i);
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}
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/// <summary>
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/// Removes the element at the specified index of the <c>LevelCollection</c>.
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/// </summary>
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/// <param name="index">The zero-based index of the element to remove.</param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// <para><paramref name="index"/> is less than zero</para>
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/// <para>-or-</para>
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/// <para><paramref name="index"/> is equal to or greater than <see cref="LevelCollection.Count"/>.</para>
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/// </exception>
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public virtual void RemoveAt(int index)
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{
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ValidateIndex(index); // throws
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m_count--;
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if (index < m_count)
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{
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Array.Copy(m_array, index + 1, m_array, index, m_count - index);
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}
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// We can't set the deleted entry equal to null, because it might be a value type.
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// Instead, we'll create an empty single-element array of the right type and copy it
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// over the entry we want to erase.
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Level[] temp = new Level[1];
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Array.Copy(temp, 0, m_array, m_count, 1);
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m_version++;
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}
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/// <summary>
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/// Gets a value indicating whether the collection has a fixed size.
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/// </summary>
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/// <value>true if the collection has a fixed size; otherwise, false. The default is false</value>
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public virtual bool IsFixedSize
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{
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get { return false; }
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}
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/// <summary>
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/// Gets a value indicating whether the IList is read-only.
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/// </summary>
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/// <value>true if the collection is read-only; otherwise, false. The default is false</value>
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public virtual bool IsReadOnly
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{
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get { return false; }
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}
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#endregion
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#region Operations (type-safe IEnumerable)
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/// <summary>
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/// Returns an enumerator that can iterate through the <c>LevelCollection</c>.
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/// </summary>
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/// <returns>An <see cref="Enumerator"/> for the entire <c>LevelCollection</c>.</returns>
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public virtual ILevelCollectionEnumerator GetEnumerator()
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{
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return new Enumerator(this);
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}
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#endregion
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#region Public helpers (just to mimic some nice features of ArrayList)
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/// <summary>
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/// Gets or sets the number of elements the <c>LevelCollection</c> can contain.
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/// </summary>
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public virtual int Capacity
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{
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get
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{
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return m_array.Length;
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}
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set
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{
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if (value < m_count)
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{
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value = m_count;
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}
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if (value != m_array.Length)
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{
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if (value > 0)
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{
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Level[] temp = new Level[value];
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Array.Copy(m_array, 0, temp, 0, m_count);
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m_array = temp;
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}
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else
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{
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m_array = new Level[DEFAULT_CAPACITY];
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}
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}
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}
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}
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/// <summary>
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/// Adds the elements of another <c>LevelCollection</c> to the current <c>LevelCollection</c>.
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/// </summary>
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/// <param name="x">The <c>LevelCollection</c> whose elements should be added to the end of the current <c>LevelCollection</c>.</param>
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/// <returns>The new <see cref="LevelCollection.Count"/> of the <c>LevelCollection</c>.</returns>
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public virtual int AddRange(LevelCollection x)
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{
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if (m_count + x.Count >= m_array.Length)
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{
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EnsureCapacity(m_count + x.Count);
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}
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Array.Copy(x.m_array, 0, m_array, m_count, x.Count);
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m_count += x.Count;
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m_version++;
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return m_count;
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}
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/// <summary>
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/// Adds the elements of a <see cref="Level"/> array to the current <c>LevelCollection</c>.
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/// </summary>
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/// <param name="x">The <see cref="Level"/> array whose elements should be added to the end of the <c>LevelCollection</c>.</param>
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/// <returns>The new <see cref="LevelCollection.Count"/> of the <c>LevelCollection</c>.</returns>
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public virtual int AddRange(Level[] x)
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{
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if (m_count + x.Length >= m_array.Length)
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{
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EnsureCapacity(m_count + x.Length);
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}
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Array.Copy(x, 0, m_array, m_count, x.Length);
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m_count += x.Length;
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m_version++;
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return m_count;
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}
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/// <summary>
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/// Adds the elements of a <see cref="Level"/> collection to the current <c>LevelCollection</c>.
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/// </summary>
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/// <param name="col">The <see cref="Level"/> collection whose elements should be added to the end of the <c>LevelCollection</c>.</param>
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/// <returns>The new <see cref="LevelCollection.Count"/> of the <c>LevelCollection</c>.</returns>
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public virtual int AddRange(ICollection col)
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{
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if (m_count + col.Count >= m_array.Length)
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{
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EnsureCapacity(m_count + col.Count);
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}
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foreach(object item in col)
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{
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Add((Level)item);
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}
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return m_count;
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}
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/// <summary>
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/// Sets the capacity to the actual number of elements.
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/// </summary>
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public virtual void TrimToSize()
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{
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this.Capacity = m_count;
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}
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#endregion
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#region Implementation (helpers)
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/// <exception cref="ArgumentOutOfRangeException">
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/// <para><paramref name="i"/> is less than zero</para>
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/// <para>-or-</para>
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/// <para><paramref name="i"/> is equal to or greater than <see cref="LevelCollection.Count"/>.</para>
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/// </exception>
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private void ValidateIndex(int i)
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{
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ValidateIndex(i, false);
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}
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/// <exception cref="ArgumentOutOfRangeException">
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/// <para><paramref name="i"/> is less than zero</para>
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/// <para>-or-</para>
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/// <para><paramref name="i"/> is equal to or greater than <see cref="LevelCollection.Count"/>.</para>
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/// </exception>
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private void ValidateIndex(int i, bool allowEqualEnd)
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{
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int max = (allowEqualEnd) ? (m_count) : (m_count-1);
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if (i < 0 || i > max)
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{
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throw log4net.Util.SystemInfo.CreateArgumentOutOfRangeException("i", (object)i, "Index was out of range. Must be non-negative and less than the size of the collection. [" + (object)i + "] Specified argument was out of the range of valid values.");
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}
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}
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private void EnsureCapacity(int min)
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{
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int newCapacity = ((m_array.Length == 0) ? DEFAULT_CAPACITY : m_array.Length * 2);
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if (newCapacity < min)
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{
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newCapacity = min;
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}
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this.Capacity = newCapacity;
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}
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#endregion
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#region Implementation (ICollection)
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void ICollection.CopyTo(Array array, int start)
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{
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Array.Copy(m_array, 0, array, start, m_count);
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}
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#endregion
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#region Implementation (IList)
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object IList.this[int i]
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{
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get { return (object)this[i]; }
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set { this[i] = (Level)value; }
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}
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int IList.Add(object x)
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{
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return this.Add((Level)x);
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}
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bool IList.Contains(object x)
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{
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return this.Contains((Level)x);
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}
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int IList.IndexOf(object x)
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{
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return this.IndexOf((Level)x);
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}
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void IList.Insert(int pos, object x)
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{
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this.Insert(pos, (Level)x);
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}
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void IList.Remove(object x)
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{
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this.Remove((Level)x);
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}
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void IList.RemoveAt(int pos)
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{
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this.RemoveAt(pos);
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}
|
|
#endregion
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|
#region Implementation (IEnumerable)
|
|
IEnumerator IEnumerable.GetEnumerator()
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{
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return (IEnumerator)(this.GetEnumerator());
|
}
|
|
#endregion
|
|
#region Nested enumerator class
|
|
/// <summary>
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/// Supports simple iteration over a <see cref="LevelCollection"/>.
|
/// </summary>
|
private sealed class Enumerator : IEnumerator, ILevelCollectionEnumerator
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{
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#region Implementation (data)
|
|
private readonly LevelCollection m_collection;
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private int m_index;
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private int m_version;
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|
#endregion
|
|
#region Construction
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|
/// <summary>
|
/// Initializes a new instance of the <c>Enumerator</c> class.
|
/// </summary>
|
/// <param name="tc"></param>
|
internal Enumerator(LevelCollection tc)
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{
|
m_collection = tc;
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m_index = -1;
|
m_version = tc.m_version;
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}
|
|
#endregion
|
|
#region Operations (type-safe IEnumerator)
|
|
/// <summary>
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/// Gets the current element in the collection.
|
/// </summary>
|
public Level Current
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{
|
get { return m_collection[m_index]; }
|
}
|
|
/// <summary>
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/// Advances the enumerator to the next element in the collection.
|
/// </summary>
|
/// <returns>
|
/// <c>true</c> if the enumerator was successfully advanced to the next element;
|
/// <c>false</c> if the enumerator has passed the end of the collection.
|
/// </returns>
|
/// <exception cref="InvalidOperationException">
|
/// The collection was modified after the enumerator was created.
|
/// </exception>
|
public bool MoveNext()
|
{
|
if (m_version != m_collection.m_version)
|
{
|
throw new System.InvalidOperationException("Collection was modified; enumeration operation may not execute.");
|
}
|
|
++m_index;
|
return (m_index < m_collection.Count);
|
}
|
|
/// <summary>
|
/// Sets the enumerator to its initial position, before the first element in the collection.
|
/// </summary>
|
public void Reset()
|
{
|
m_index = -1;
|
}
|
|
#endregion
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#region Implementation (IEnumerator)
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object IEnumerator.Current
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{
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get { return this.Current; }
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}
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#endregion
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}
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#endregion
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#region Nested Read Only Wrapper class
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private sealed class ReadOnlyLevelCollection : LevelCollection
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{
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#region Implementation (data)
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private readonly LevelCollection m_collection;
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#endregion
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#region Construction
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internal ReadOnlyLevelCollection(LevelCollection list) : base(Tag.Default)
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{
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m_collection = list;
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}
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#endregion
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#region Type-safe ICollection
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public override void CopyTo(Level[] array)
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{
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m_collection.CopyTo(array);
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}
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public override void CopyTo(Level[] array, int start)
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{
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m_collection.CopyTo(array,start);
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}
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public override int Count
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{
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get { return m_collection.Count; }
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}
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public override bool IsSynchronized
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{
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get { return m_collection.IsSynchronized; }
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}
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public override object SyncRoot
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{
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get { return this.m_collection.SyncRoot; }
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}
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#endregion
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#region Type-safe IList
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public override Level this[int i]
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{
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get { return m_collection[i]; }
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set { throw new NotSupportedException("This is a Read Only Collection and can not be modified"); }
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}
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public override int Add(Level x)
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{
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throw new NotSupportedException("This is a Read Only Collection and can not be modified");
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}
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public override void Clear()
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{
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throw new NotSupportedException("This is a Read Only Collection and can not be modified");
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}
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public override bool Contains(Level x)
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{
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return m_collection.Contains(x);
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}
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public override int IndexOf(Level x)
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{
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return m_collection.IndexOf(x);
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}
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public override void Insert(int pos, Level x)
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{
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throw new NotSupportedException("This is a Read Only Collection and can not be modified");
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}
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public override void Remove(Level x)
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{
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throw new NotSupportedException("This is a Read Only Collection and can not be modified");
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}
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public override void RemoveAt(int pos)
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{
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throw new NotSupportedException("This is a Read Only Collection and can not be modified");
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}
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public override bool IsFixedSize
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{
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get { return true; }
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}
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public override bool IsReadOnly
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{
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get { return true; }
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}
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#endregion
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#region Type-safe IEnumerable
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public override ILevelCollectionEnumerator GetEnumerator()
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{
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return m_collection.GetEnumerator();
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}
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#endregion
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#region Public Helpers
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// (just to mimic some nice features of ArrayList)
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public override int Capacity
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{
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get { return m_collection.Capacity; }
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set { throw new NotSupportedException("This is a Read Only Collection and can not be modified"); }
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}
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public override int AddRange(LevelCollection x)
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{
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throw new NotSupportedException("This is a Read Only Collection and can not be modified");
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}
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public override int AddRange(Level[] x)
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{
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throw new NotSupportedException("This is a Read Only Collection and can not be modified");
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}
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#endregion
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}
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#endregion
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}
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}
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