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annotate Collections/DictionaryUtils.cs @ 86:0744a1cc03cc

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* Add a generic single argument method invoker delegate no-open-ticket
author IBBoard <dev@ibboard.co.uk>
date Tue, 20 Jul 2010 19:26:06 +0000
parents e38192f55d2d
children
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1 // This file (DictionaryUtils.cs) is a part of the IBBoard library and is copyright 2009 IBBoard.
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2 //
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3 // The file and the library/program it is in are licensed under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING.LGPL for more information and the full license.
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4
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5 using System;
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6 using System.Collections.Generic;
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7
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8 namespace IBBoard
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9 {
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10 public class DictionaryUtils
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11 {
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12 /// <summary>
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13 /// Takes the set of values in a dictionary and returns them as an array of typed objects.
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14 /// </summary>
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15 /// <param name="dictionary">
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16 /// A <see cref="IDictionary"/> to extract an array of values from
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17 /// </param>
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18 /// <returns>
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19 /// An array of <see cref="VALUE_TYPE"/> objects taken from the Values property of the dictionary, or NULL if the dictionary is NULL
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20 /// </returns>
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21 public static VALUE_TYPE[] ToArray<KEY_TYPE, VALUE_TYPE>(IDictionary<KEY_TYPE, VALUE_TYPE> dictionary)
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22 {
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23 if (dictionary == null)
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24 {
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25 return null;
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26 }
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27
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28 int entryCount = dictionary.Count;
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29 VALUE_TYPE[] col = new VALUE_TYPE[entryCount];
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30
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31 if (entryCount > 0)
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32 {
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33 dictionary.Values.CopyTo(col, 0);
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34 }
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35
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36 return col;
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37 }
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39 /// <summary>
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40 /// Takes the set of keys in a dictionary and returns them as an array of typed objects.
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41 /// </summary>
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42 /// <param name="dictionary">
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43 /// A <see cref="IDictionary"/> to extract an array of keys from
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44 /// </param>
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45 /// <returns>
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46 /// An array of <see cref="KEY_TYPE"/> objects taken from the Keys property of the dictionary, or NULL if the dictionary is NULL
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47 /// </returns>
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48 public static KEY_TYPE[] ToKeyArray<KEY_TYPE, VALUE_TYPE>(IDictionary<KEY_TYPE, VALUE_TYPE> dictionary)
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49 {
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50 if (dictionary == null)
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51 {
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52 return null;
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53 }
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54
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55 int entryCount = dictionary.Count;
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56 KEY_TYPE[] col = new KEY_TYPE[entryCount];
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57
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58 if (entryCount > 0)
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59 {
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60 dictionary.Keys.CopyTo(col, 0);
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61 }
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62
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63 return col;
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64 }
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65
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66 /// <summary>
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67 /// Takes two dictionaries and merges them. If a key exists in both dictionaries then the value in <code>firstDictionary</code> takes priority.
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68 /// </summary>
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69 /// <param name="firstDictionary">
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70 /// The <see cref="IDictionary"/> to merge values in to
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71 /// </param>
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72 /// <param name="secondDictionary">
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73 /// The <see cref="IDictionary"/> of values to merge in
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74 /// </param>
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75 /// <returns>
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76 /// A <see cref="IDictionary"/> made by adding values from <code>secondDictionary</code> where the key didn't exist in <code>firstDictionary</code>
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77 /// </returns>
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78 public static IDictionary<KEY_TYPE, VALUE_TYPE> Merge<KEY_TYPE, VALUE_TYPE>(IDictionary<KEY_TYPE, VALUE_TYPE> firstDictionary, IDictionary<KEY_TYPE, VALUE_TYPE> secondDictionary)
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79 {
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80 Dictionary<KEY_TYPE, VALUE_TYPE> mergedDictionary = new Dictionary<KEY_TYPE, VALUE_TYPE>(firstDictionary);
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81
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82 foreach (KEY_TYPE key in secondDictionary.Keys)
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83 {
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84 if (!mergedDictionary.ContainsKey(key))
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85 {
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86 mergedDictionary.Add(key, secondDictionary[key]);
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87 }
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88 }
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90 return mergedDictionary;
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91 }
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93 /// <summary>
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94 /// Convenience method to get a value from a dictionary for a given key. This method wraps a TryGetValue call in a single function.
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95 /// </summary>
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96 /// <param name="dictionary">
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97 /// The <see cref="IDictionary"/> to get a value from
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98 /// </param>
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99 /// <param name="key">
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100 /// The key to get the value for
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101 /// </param>
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102 /// <returns>
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103 /// The value for <code>key</code>, or <code>null</code> if there was no value for the key
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104 /// </returns>
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105 public static VALUE_TYPE GetValue<KEY_TYPE, VALUE_TYPE>(IDictionary<KEY_TYPE, VALUE_TYPE> dictionary, KEY_TYPE key)
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106 {
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107 if (dictionary == null)
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108 {
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109 return default(VALUE_TYPE);
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110 }
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111
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112 VALUE_TYPE val = default(VALUE_TYPE);
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113 dictionary.TryGetValue(key, out val);
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114 return val;
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115 }
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116 }
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117 }