Keyed List
/*
Copyright (c) 2005, Marc Clifton
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*/
using System;
using System.Collections;
using System.Collections.Generic;
namespace Newtonsoft.Utilities.Collections
{
[Serializable]
public class KeyedList<K, V> : IDictionary<K, V>, IList<KeyValuePair<K, V>>
{
private readonly Dictionary<K, V> objectTable = new Dictionary<K, V>();
private readonly List<KeyValuePair<K, V>> objectList = new List<KeyValuePair<K, V>>();
/// <summary>
/// Returns false.
/// </summary>
public bool IsReadOnly
{
get { return false; }
}
/// <summary>
/// Returns the number of entries in the KeyedList.
/// </summary>
public int Count
{
get { return objectList.Count; }
}
/// <summary>
/// Get/Set the value at the specified index.
/// </summary>
/// <param name="index">The index.</param>
/// <returns>The value.</returns>
public KeyValuePair<K, V> this[int index]
{
get
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index");
return objectList[index];
}
set
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index");
objectList[index] = value;
objectTable[value.Key] = value.Value;
}
}
/// <summary>
/// Get/Set the value associated with the specified key.
/// </summary>
/// <param name="key">The key.</param>
/// <returns>The associated value.</returns>
public virtual V this[K key]
{
get { return objectTable[key]; }
set
{
if (objectTable.ContainsKey(key))
{
objectTable[key] = value;
objectList[IndexOf(key)] = new KeyValuePair<K, V>(key, value);
}
else
{
Add(key, value);
}
}
}
/// <summary>
/// Get an unordered list of keys.
/// This collection refers back to the keys in the original Dictionary.
/// </summary>
public ICollection<K> Keys
{
get { return objectTable.Keys; }
}
/// <summary>
/// Get an unordered list of values.
/// This collection refers back to the values in the original Dictionary.
/// </summary>
public ICollection<V> Values
{
get { return objectTable.Values; }
}
/// <summary>
/// Get the ordered list of keys.
/// This is a copy of the keys in the original Dictionary.
/// </summary>
public List<K> OrderedKeys
{
get
{
List<K> retList = new List<K>();
foreach (KeyValuePair<K, V> kvp in objectList)
{
retList.Add(kvp.Key);
}
return retList;
}
}
/// <summary>
/// Get the ordered list of values.
/// This is a copy of the values in the original Dictionary.
/// </summary>
public List<V> OrderedValues
{
get
{
List<V> retList = new List<V>();
foreach (KeyValuePair<K, V> kvp in objectList)
{
retList.Add(kvp.Value);
}
return retList;
}
}
/// <summary>
/// Returns the key at the specified index.
/// </summary>
/// <param name="index">The index.</param>
/// <returns>The key at the index.</returns>
public K GetKey(int index)
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index");
return objectList[index].Key;
}
/// <summary>
/// Returns the value at the specified index.
/// </summary>
/// <param name="index">The index.</param>
/// <returns>The value at the index.</returns>
public V GetValue(int index)
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index");
return objectList[index].Value;
}
/// <summary>
/// Get the index of a particular key.
/// </summary>
/// <param name="key">The key to find the index of.</param>
/// <returns>The index of the key, or -1 if not found.</returns>
public int IndexOf(K key)
{
int ret = -1;
for (int i = 0; i < objectList.Count; i++)
{
if (objectList[i].Key.Equals(key))
{
ret = i;
break;
}
}
return ret;
}
/// <summary>
/// Given the key-value pair, find the index.
/// </summary>
/// <param name="kvp">The key-value pair.</param>
/// <returns>The index, or -1 if not found.</returns>
public int IndexOf(KeyValuePair<K, V> kvp)
{
return objectList.IndexOf(kvp);
}
/// <summary>
/// Gets the Dictionary class backing the KeyedList.
/// </summary>
public Dictionary<K, V> ObjectTable
{
get { return objectTable; }
}
/// <summary>
/// Clears all entries in the KeyedList.
/// </summary>
public void Clear()
{
objectTable.Clear();
objectList.Clear();
}
/// <summary>
/// Test if the KeyedList contains the key.
/// </summary>
/// <param name="key">The key.</param>
/// <returns>True if the key is found.</returns>
public bool ContainsKey(K key)
{
return objectTable.ContainsKey(key);
}
/// <summary>
/// Test if the KeyedList contains the key in the key-value pair.
/// </summary>
/// <param name="kvp">The key-value pair.</param>
/// <returns>True if the key is found.</returns>
public bool Contains(KeyValuePair<K, V> kvp)
{
return objectList.Contains(kvp);
}
/// <summary>
/// Adds a key-value pair to the KeyedList.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="value">The associated value.</param>
public void Add(K key, V value)
{
objectTable.Add(key, value);
objectList.Add(new KeyValuePair<K, V>(key, value));
}
/// <summary>
/// Adds a key-value pair to the KeyedList.
/// </summary>
/// <param name="kvp">The KeyValuePair instance.</param>
public void Add(KeyValuePair<K, V> kvp)
{
Add(kvp.Key, kvp.Value);
}
/// <summary>
/// Copy the entire key-value pairs to the KeyValuePair array, starting
/// at the specified index of the target array. The array is populated
/// as an ordered list.
/// </summary>
/// <param name="kvpa">The KeyValuePair array.</param>
/// <param name="idx">The position to start the copy.</param>
public void CopyTo(KeyValuePair<K, V>[] kvpa, int idx)
{
objectList.CopyTo(kvpa, idx);
}
/// <summary>
/// Insert the key-value at the specified index.
/// </summary>
/// <param name="index">The zero-based insert point.</param>
/// <param name="key">The key.</param>
/// <param name="value">The value.</param>
public void Insert(int index, K key, V value)
{
if (index < 0 || index > Count)
throw new ArgumentOutOfRangeException("index");
objectTable.Add(key, value);
objectList.Insert(index, new KeyValuePair<K, V>(key, value));
}
/// <summary>
/// Insert the key-value pair at the specified index location.
/// </summary>
/// <param name="index">The key.</param>
/// <param name="kvp">The value.</param>
public void Insert(int index, KeyValuePair<K, V> kvp)
{
if (index < 0 || index > Count)
throw new ArgumentOutOfRangeException("index");
objectTable.Add(kvp.Key, kvp.Value);
objectList.Insert(index, kvp);
}
/// <summary>
/// Remove the entry.
/// </summary>
/// <param name="key">The key identifying the key-value pair.</param>
/// <returns>True if removed.</returns>
public bool Remove(K key)
{
bool found = objectTable.Remove(key);
if (found)
objectList.RemoveAt(IndexOf(key));
return found;
}
/// <summary>
/// Remove the key in the specified KeyValuePair instance. The Value
/// property is ignored.
/// </summary>
/// <param name="kvp">The key-value identifying the entry.</param>
/// <returns>True if removed.</returns>
public bool Remove(KeyValuePair<K, V> kvp)
{
bool found = objectList.Remove(kvp);
if (found)
objectTable.Remove(kvp.Key);
return found;
}
/// <summary>
/// Remove the entry at the specified index.
/// </summary>
/// <param name="index">The index to the entry to be removed.</param>
public void RemoveAt(int index)
{
if (index < 0 || index >= Count)
throw new ArgumentOutOfRangeException("index");
objectTable.Remove(objectList[index].Key);
objectList.RemoveAt(index);
}
/// <summary>
/// Attempt to get the value, given the key, without throwing an exception if not found.
/// </summary>
/// <param name="key">The key indentifying the entry.</param>
/// <param name="val">The value, if found.</param>
/// <returns>True if found.</returns>
public bool TryGetValue(K key, out V val)
{
return objectTable.TryGetValue(key, out val);
}
/// <summary>
/// Returns an ordered System.Collections KeyValuePair objects.
/// </summary>
IEnumerator IEnumerable.GetEnumerator()
{
return objectList.GetEnumerator();
}
/// <summary>
/// Returns an ordered KeyValuePair enumerator.
/// </summary>
IEnumerator<KeyValuePair<K, V>> IEnumerable<KeyValuePair<K, V>>.GetEnumerator()
{
return objectList.GetEnumerator();
}
}
}
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