88 lines
2.8 KiB
C#
88 lines
2.8 KiB
C#
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/*
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* NullableDictionary - A simple Dictionary that can handle null as a key
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*
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* Author: Phillip Piper
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* Date: 31-March-2011 5:53 pm
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*
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* Change log:
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* 2011-03-31 JPP - Split into its own file
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*
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* Copyright (C) 2011-2014 Phillip Piper
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* If you wish to use this code in a closed source application, please contact phillip_piper@bigfoot.com.
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*/
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Collections;
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namespace BrightIdeasSoftware {
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/// <summary>
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/// A simple-minded implementation of a Dictionary that can handle null as a key.
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/// </summary>
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/// <typeparam name="TKey">The type of the dictionary key</typeparam>
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/// <typeparam name="TValue">The type of the values to be stored</typeparam>
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/// <remarks>This is not a full implementation and is only meant to handle
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/// collecting groups by their keys, since groups can have null as a key value.</remarks>
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internal class NullableDictionary<TKey, TValue> : Dictionary<TKey, TValue> {
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private bool hasNullKey;
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private TValue nullValue;
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new public TValue this[TKey key] {
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get {
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if (key != null)
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return base[key];
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if (this.hasNullKey)
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return this.nullValue;
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throw new KeyNotFoundException();
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}
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set {
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if (key == null) {
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this.hasNullKey = true;
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this.nullValue = value;
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} else
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base[key] = value;
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}
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}
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new public bool ContainsKey(TKey key) {
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return key == null ? this.hasNullKey : base.ContainsKey(key);
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}
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new public IList Keys {
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get {
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ArrayList list = new ArrayList(base.Keys);
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if (this.hasNullKey)
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list.Add(null);
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return list;
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}
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}
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new public IList<TValue> Values {
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get {
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List<TValue> list = new List<TValue>(base.Values);
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if (this.hasNullKey)
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list.Add(this.nullValue);
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return list;
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}
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}
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}
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}
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