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1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Linq;
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4 | using System.Text;
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5 | using System.Diagnostics.Contracts;
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6 |
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7 | namespace Microsoft.Research.DynamicDataDisplay.Common
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8 | {
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9 | /// <summary>
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10 | /// Represents a dictionary with automatic removal of old values.
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11 | /// </summary>
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12 | /// <typeparam name="T"></typeparam>
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13 | public sealed class RingDictionary<T>
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14 | {
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15 | private int startGeneration = 0;
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16 | private int generation;
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17 | private readonly Dictionary<int, T> dict = new Dictionary<int, T>();
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18 | private readonly int maxElements = 5;
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19 |
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20 | public RingDictionary(int maxElements = 5)
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21 | {
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22 | Contract.Assert(maxElements >= 1);
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23 |
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24 | this.maxElements = maxElements;
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25 | }
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26 |
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27 | public int Generation
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28 | {
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29 | get { return generation; }
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30 | }
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31 |
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32 | public int StartGeneration
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33 | {
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34 | get { return startGeneration; }
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35 | }
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36 |
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37 | public bool ContainsValue(T value)
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38 | {
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39 | return dict.ContainsValue(value);
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40 | }
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41 |
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42 | public void AddValue(T value)
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43 | {
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44 | Contract.Assert(value != null);
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45 |
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46 | dict.Add(generation++, value);
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47 | Cleanup();
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48 | }
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49 |
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50 | public int Count
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51 | {
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52 | get { return dict.Count; }
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53 | }
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54 |
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55 | private void Cleanup()
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56 | {
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57 | while ((generation - startGeneration) > maxElements)
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58 | {
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59 | dict.Remove(startGeneration);
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60 | startGeneration++;
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61 | }
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62 | }
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63 | }
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64 | }
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