| using System; |
| using System.Collections; |
| using System.Collections.Generic; |
| |
| namespace Lucene.Net.Support |
| { |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /// <summary> |
| /// Represents a strongly typed list of objects that can be accessed by index. |
| /// Provides methods to manipulate lists. Also provides functionality |
| /// to compare lists against each other through an implementations of |
| /// <see cref="IEquatable{T}"/>, or to wrap an existing list to use |
| /// the same comparison logic as this one while not affecting any of its |
| /// other functionality. |
| /// </summary> |
| /// <typeparam name="T">The type of elements in the list.</typeparam> |
| #if FEATURE_SERIALIZABLE |
| [Serializable] |
| #endif |
| public class EquatableList<T> : IList<T>, IEquatable<IList<T>> |
| #if FEATURE_CLONEABLE |
| , System.ICloneable |
| #endif |
| { |
| private readonly IList<T> list; |
| |
| /// <summary>Initializes a new instance of the |
| /// <see cref="EquatableList{T}"/> class that is empty and has the |
| /// default initial capacity.</summary> |
| public EquatableList() |
| { |
| list = new List<T>(); |
| } |
| |
| /// <summary> |
| /// Initializes a new instance of <see cref="EquatableList{T}"/>. |
| /// <para/> |
| /// If the <paramref name="wrap"/> parameter is <c>true</c>, the |
| /// <paramref name="collection"/> is used as is without doing |
| /// a copy operation. Otherwise, the collection is copied |
| /// (which is the same operation as the |
| /// <see cref="EquatableList{T}.EquatableList(IEnumerable{T})"/> overload). |
| /// <para/> |
| /// The internal <paramref name="collection"/> is used for |
| /// all operations except for <see cref="Equals(object)"/>, <see cref="GetHashCode()"/>, |
| /// and <see cref="ToString()"/>, which are all based on deep analysis |
| /// of this collection and any nested collections. |
| /// </summary> |
| /// <param name="collection">The collection that will either be wrapped or copied |
| /// depending on the value of <paramref name="wrap"/>.</param> |
| /// <param name="wrap"><c>true</c> to wrap an existing <see cref="IList{T}"/> without copying, |
| /// or <c>false</c> to copy the collection into a new <see cref="List{T}"/>.</param> |
| public EquatableList(IList<T> collection, bool wrap) |
| { |
| if (collection == null) |
| throw new ArgumentNullException("collection"); |
| |
| if (wrap) |
| { |
| this.list = collection; |
| } |
| else |
| { |
| this.list = new List<T>(collection); |
| } |
| } |
| |
| /// <summary> |
| /// Initializes a new |
| /// instance of the <see cref="EquatableList{T}"/> |
| /// class that contains elements copied from the specified collection and has |
| /// sufficient capacity to accommodate the number of elements copied. |
| /// </summary> |
| /// <param name="collection">The collection whose elements are copied to the new list.</param> |
| public EquatableList(IEnumerable<T> collection) |
| { |
| list = new List<T>(collection); |
| } |
| |
| /// <summary>Initializes a new instance of the <see cref="EquatableList{T}"/> |
| /// class that is empty and has the specified initial capacity.</summary> |
| /// <param name="capacity">The number of elements that the new list can initially store.</param> |
| public EquatableList(int capacity) |
| { |
| list = new List<T>(capacity); |
| } |
| |
| #region IList<T> members |
| |
| /// <summary> |
| /// Gets or sets the element at the specified index. |
| /// </summary> |
| /// <param name="index">The zero-based index of the element to get or set.</param> |
| public virtual T this[int index] |
| { |
| get { return list[index]; } |
| set { list[index] = value; } |
| } |
| |
| /// <summary> |
| /// Gets the number of elements contained in the <see cref="EquatableList{T}"/>. |
| /// </summary> |
| public virtual int Count |
| { |
| get { return list.Count; } |
| } |
| |
| /// <summary> |
| /// Gets a value indicating whether the <see cref="EquatableList{T}"/> is read-only. |
| /// </summary> |
| public virtual bool IsReadOnly |
| { |
| get { return list.IsReadOnly; } |
| } |
| |
| /// <summary> |
| /// Adds an object to the end of the <see cref="EquatableList{T}"/>. |
| /// </summary> |
| /// <param name="item">The object to be added to the end of the <see cref="EquatableList{T}"/>. The value can be <c>null</c> for reference types.</param> |
| public virtual void Add(T item) |
| { |
| list.Add(item); |
| } |
| |
| /// <summary> |
| /// Removes all items from the <see cref="EquatableList{T}"/>. |
| /// </summary> |
| public virtual void Clear() |
| { |
| list.Clear(); |
| } |
| |
| /// <summary> |
| /// Determines whether the <see cref="EquatableList{T}"/> contains a specific value. |
| /// </summary> |
| /// <param name="item">The object to locate in the <see cref="EquatableList{T}"/>.</param> |
| /// <returns><c>true</c> if the Object is found in the <see cref="EquatableList{T}"/>; otherwise, <c>false</c>.</returns> |
| public virtual bool Contains(T item) |
| { |
| return list.Contains(item); |
| } |
| |
| /// <summary> |
| /// Copies the entire <see cref="EquatableList{T}"/> to a compatible one-dimensional array, |
| /// starting at the specified index of the target array. |
| /// </summary> |
| /// <param name="array">The one-dimensional <see cref="Array"/> that is the |
| /// destination of the elements copied from <see cref="EquatableList{T}"/>. |
| /// The Array must have zero-based indexing.</param> |
| /// <param name="arrayIndex">The zero-based index in <paramref name="array"/> at which copying begins.</param> |
| public virtual void CopyTo(T[] array, int arrayIndex) |
| { |
| list.CopyTo(array, arrayIndex); |
| } |
| |
| /// <summary> |
| /// Returns an enumerator that iterates through the <see cref="EquatableList{T}"/>. |
| /// </summary> |
| /// <returns>An <see cref="IEnumerator{T}"/> for the <see cref="EquatableList{T}"/>.</returns> |
| public virtual IEnumerator<T> GetEnumerator() |
| { |
| return list.GetEnumerator(); |
| } |
| |
| /// <summary> |
| /// Determines the index of a specific <paramref name="item"/> in the <see cref="EquatableList{T}"/>. |
| /// </summary> |
| /// <param name="item">The object to locate in the <see cref="EquatableList{T}"/>.</param> |
| /// <returns>The index of <paramref name="item"/> if found in the list; otherwise, -1.</returns> |
| public virtual int IndexOf(T item) |
| { |
| return list.IndexOf(item); |
| } |
| |
| /// <summary> |
| /// Inserts an item to the <see cref="EquatableList{T}"/> at the specified index. |
| /// </summary> |
| /// <param name="index">The zero-based index at which <paramref name="item"/> should be inserted.</param> |
| /// <param name="item">The object to insert into the <see cref="EquatableList{T}"/>.</param> |
| public virtual void Insert(int index, T item) |
| { |
| list.Insert(index, item); |
| } |
| |
| /// <summary> |
| /// Removes the first occurrence of a specific object from the <see cref="EquatableList{T}"/>. |
| /// </summary> |
| /// <param name="item">The object to remove from the <see cref="EquatableList{T}"/>.</param> |
| /// <returns><c>true</c> if <paramref name="item"/> was successfully removed from the |
| /// <see cref="EquatableList{T}"/>; otherwise, <c>false</c>. This method also returns |
| /// <c>false</c> if item is not found in the original <see cref="EquatableList{T}"/>.</returns> |
| public virtual bool Remove(T item) |
| { |
| return list.Remove(item); |
| } |
| |
| /// <summary> |
| /// Removes the <see cref="EquatableList{T}"/> item at the specified index. |
| /// </summary> |
| /// <param name="index">The zero-based index of the item to remove.</param> |
| public virtual void RemoveAt(int index) |
| { |
| list.RemoveAt(index); |
| } |
| |
| /// <summary> |
| /// Returns an enumerator that iterates through the <see cref="EquatableList{T}"/>. |
| /// </summary> |
| /// <returns>An <see cref="IEnumerator"/> for the <see cref="EquatableList{T}"/>.</returns> |
| IEnumerator IEnumerable.GetEnumerator() |
| { |
| return list.GetEnumerator(); |
| } |
| |
| #endregion |
| |
| #region Operator overrides |
| |
| // TODO: When diverging from Java version of Lucene, can uncomment these to adhere to best practices when overriding the Equals method and implementing IEquatable<T>. |
| ///// <summary>Overload of the == operator, it compares a |
| ///// <see cref="EquatableList{T}"/> to an <see cref="IEnumerable{T}"/> |
| ///// implementation.</summary> |
| ///// <param name="x">The <see cref="EquatableList{T}"/> to compare |
| ///// against <paramref name="y"/>.</param> |
| ///// <param name="y">The <see cref="IEnumerable{T}"/> to compare |
| ///// against <paramref name="x"/>.</param> |
| ///// <returns>True if the instances are equal, false otherwise.</returns> |
| //public static bool operator ==(EquatableList<T> x, System.Collections.Generic.IEnumerable<T> y) |
| //{ |
| // // Call Equals. |
| // return Equals(x, y); |
| //} |
| |
| ///// <summary>Overload of the == operator, it compares a |
| ///// <see cref="EquatableList{T}"/> to an <see cref="IEnumerable{T}"/> |
| ///// implementation.</summary> |
| ///// <param name="y">The <see cref="EquatableList{T}"/> to compare |
| ///// against <paramref name="x"/>.</param> |
| ///// <param name="x">The <see cref="IEnumerable{T}"/> to compare |
| ///// against <paramref name="y"/>.</param> |
| ///// <returns>True if the instances are equal, false otherwise.</returns> |
| //public static bool operator ==(System.Collections.Generic.IEnumerable<T> x, EquatableList<T> y) |
| //{ |
| // // Call equals. |
| // return Equals(x, y); |
| //} |
| |
| ///// <summary>Overload of the != operator, it compares a |
| ///// <see cref="EquatableList{T}"/> to an <see cref="IEnumerable{T}"/> |
| ///// implementation.</summary> |
| ///// <param name="x">The <see cref="EquatableList{T}"/> to compare |
| ///// against <paramref name="y"/>.</param> |
| ///// <param name="y">The <see cref="IEnumerable{T}"/> to compare |
| ///// against <paramref name="x"/>.</param> |
| ///// <returns>True if the instances are not equal, false otherwise.</returns> |
| //public static bool operator !=(EquatableList<T> x, System.Collections.Generic.IEnumerable<T> y) |
| //{ |
| // // Return the negative of the equals operation. |
| // return !(x == y); |
| //} |
| |
| ///// <summary>Overload of the != operator, it compares a |
| ///// <see cref="EquatableList{T}"/> to an <see cref="IEnumerable{T}"/> |
| ///// implementation.</summary> |
| ///// <param name="y">The <see cref="EquatableList{T}"/> to compare |
| ///// against <paramref name="x"/>.</param> |
| ///// <param name="x">The <see cref="IEnumerable{T}"/> to compare |
| ///// against <paramref name="y"/>.</param> |
| ///// <returns>True if the instances are not equal, false otherwise.</returns> |
| //public static bool operator !=(System.Collections.Generic.IEnumerable<T> x, EquatableList<T> y) |
| //{ |
| // // Return the negative of the equals operation. |
| // return !(x == y); |
| //} |
| |
| #endregion |
| |
| #region IEquatable<T> members |
| |
| /// <summary> |
| /// Compares this sequence to another <see cref="IList{T}"/> |
| /// implementation, returning <c>true</c> if they are equal, <c>false</c> otherwise. |
| /// <para/> |
| /// The comparison takes into consideration any values in this collection and values |
| /// of any nested collections, but does not take into consideration the data type. |
| /// Therefore, <see cref="EquatableList{T}"/> can equal any <see cref="IList{T}"/> |
| /// with the exact same values in the same order. |
| /// </summary> |
| /// <param name="other">The other <see cref="IList{T}"/> implementation |
| /// to compare against.</param> |
| /// <returns><c>true</c> if the sequence in <paramref name="other"/> |
| /// is the same as this one.</returns> |
| public virtual bool Equals(IList<T> other) |
| { |
| return Collections.Equals(this, other); |
| } |
| |
| #endregion |
| |
| #region IClonable members |
| |
| /// <summary>Clones the <see cref="EquatableList{T}"/>.</summary> |
| /// <remarks>This is a shallow clone.</remarks> |
| /// <returns>A new shallow clone of this |
| /// <see cref="EquatableList{T}"/>.</returns> |
| public virtual object Clone() |
| { |
| // Just create a new one, passing this to the constructor. |
| return new EquatableList<T>(this); |
| } |
| |
| #endregion |
| |
| #region Object overrides |
| |
| /// <summary> |
| /// If the object passed implements <see cref="IList{T}"/>, |
| /// compares this sequence to <paramref name="other"/>, returning <c>true</c> if they |
| /// are equal, <c>false</c> otherwise. |
| /// <para/> |
| /// The comparison takes into consideration any values in this collection and values |
| /// of any nested collections, but does not take into consideration the data type. |
| /// Therefore, <see cref="EquatableList{T}"/> can equal any <see cref="IList{T}"/> |
| /// with the exact same values in the same order. |
| /// </summary> |
| /// <param name="other">The other object |
| /// to compare against.</param> |
| /// <returns><c>true</c> if the sequence in <paramref name="other"/> |
| /// is the same as this one.</returns> |
| public override bool Equals(object other) |
| { |
| if (!(other is IList<T>)) |
| { |
| return false; |
| } |
| return this.Equals(other as IList<T>); |
| } |
| |
| /// <summary> |
| /// Returns the hash code value for this list. |
| /// <para/> |
| /// The hash code determination takes into consideration any values in |
| /// this collection and values of any nested collections, but does not |
| /// take into consideration the data type. Therefore, the hash codes will |
| /// be exactly the same for this <see cref="EquatableList{T}"/> and another |
| /// <see cref="IList{T}"/> (including arrays) with the same values in the |
| /// same order. |
| /// </summary> |
| /// <returns>the hash code value for this list</returns> |
| public override int GetHashCode() |
| { |
| return Collections.GetHashCode(this); |
| } |
| |
| /// <summary> |
| /// Returns a string representation of this collection (and any nested collections). |
| /// The string representation consists of a list of the collection's elements in |
| /// the order they are returned by its enumerator, enclosed in square brackets |
| /// ("[]"). Adjacent elements are separated by the characters ", " (comma and space). |
| /// </summary> |
| /// <returns>a string representation of this collection</returns> |
| public override string ToString() |
| { |
| return Collections.ToString(this); |
| } |
| |
| #endregion |
| } |
| } |