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 Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;
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6 |
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7 | namespace Microsoft.Research.DynamicDataDisplay.Charts
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8 | {
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9 | internal abstract class TimePeriodTicksProvider<T> : ITicksProvider<T>
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10 | {
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11 | public event EventHandler Changed;
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12 | protected void RaiseChanged()
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13 | {
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14 | if (Changed != null)
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15 | {
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16 | Changed(this, EventArgs.Empty);
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17 | }
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18 | }
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19 |
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20 | protected abstract T RoundUp(T time, DifferenceIn diff);
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21 | protected abstract T RoundDown(T time, DifferenceIn diff);
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22 |
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23 | private bool differenceInited = false;
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24 | private DifferenceIn difference;
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25 | protected DifferenceIn Difference
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26 | {
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27 | get
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28 | {
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29 | if (!differenceInited)
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30 | {
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31 | difference = GetDifferenceCore();
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32 | differenceInited = true;
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33 | }
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34 | return difference;
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35 | }
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36 | }
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37 | protected abstract DifferenceIn GetDifferenceCore();
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38 |
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39 | private int[] tickCounts = null;
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40 | protected int[] TickCounts
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41 | {
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42 | get
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43 | {
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44 | if (tickCounts == null)
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45 | tickCounts = GetTickCountsCore();
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46 | return tickCounts;
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47 | }
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48 | }
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49 | protected abstract int[] GetTickCountsCore();
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50 |
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51 | public int DecreaseTickCount(int ticksCount)
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52 | {
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53 | if (ticksCount > TickCounts[0]) return TickCounts[0];
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54 |
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55 | for (int i = 0; i < TickCounts.Length; i++)
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56 | if (ticksCount > TickCounts[i])
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57 | return TickCounts[i];
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58 |
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59 | return TickCounts.Last();
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60 | }
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61 |
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62 | public int IncreaseTickCount(int ticksCount)
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63 | {
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64 | if (ticksCount >= TickCounts[0]) return TickCounts[0];
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65 |
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66 | for (int i = TickCounts.Length - 1; i >= 0; i--)
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67 | if (ticksCount < TickCounts[i])
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68 | return TickCounts[i];
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69 |
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70 | return TickCounts.Last();
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71 | }
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72 |
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73 | protected abstract int GetSpecificValue(T start, T dt);
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74 | protected abstract T GetStart(T start, int value, int step);
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75 | protected abstract bool IsMinDate(T dt);
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76 | protected abstract T AddStep(T dt, int step);
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77 |
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78 | public ITicksInfo<T> GetTicks(Range<T> range, int ticksCount)
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79 | {
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80 | T start = range.Min;
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81 | T end = range.Max;
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82 | DifferenceIn diff = Difference;
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83 | start = RoundDown(start, end);
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84 | end = RoundUp(start, end);
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85 |
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86 | RoundingInfo bounds = RoundingHelper.CreateRoundedRange(
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87 | GetSpecificValue(start, start),
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88 | GetSpecificValue(start, end));
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89 |
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90 | int delta = (int)(bounds.Max - bounds.Min);
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91 | if (delta == 0)
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92 | return new TicksInfo<T> { Ticks = new T[] { start } };
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93 |
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94 | int step = delta / ticksCount;
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95 |
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96 | if (step == 0) step = 1;
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97 |
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98 | T tick = GetStart(start, (int)bounds.Min, step);
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99 | bool isMinDateTime = IsMinDate(tick) && step != 1;
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100 | if (isMinDateTime)
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101 | step--;
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102 |
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103 | List<T> ticks = new List<T>();
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104 | T finishTick = AddStep(range.Max, step);
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105 | while (Continue(tick, finishTick))
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106 | {
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107 | ticks.Add(tick);
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108 | tick = AddStep(tick, step);
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109 | if (isMinDateTime)
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110 | {
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111 | isMinDateTime = false;
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112 | step++;
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113 | }
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114 | }
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115 |
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116 | ticks = Trim(ticks, range);
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117 |
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118 | TicksInfo<T> res = new TicksInfo<T> { Ticks = ticks.ToArray(), Info = diff };
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119 | return res;
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120 | }
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121 |
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122 | protected abstract bool Continue(T current, T end);
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123 |
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124 | protected abstract T RoundUp(T start, T end);
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125 |
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126 | protected abstract T RoundDown(T start, T end);
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127 |
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128 | protected abstract List<T> Trim(List<T> ticks, Range<T> range);
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129 |
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130 | public ITicksProvider<T> MinorProvider
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131 | {
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132 | get { throw new NotSupportedException(); }
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133 | }
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134 |
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135 | public ITicksProvider<T> MajorProvider
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136 | {
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137 | get { throw new NotSupportedException(); }
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138 | }
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139 | }
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140 |
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141 | internal abstract class DatePeriodTicksProvider : TimePeriodTicksProvider<DateTime>
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142 | {
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143 | protected sealed override bool Continue(DateTime current, DateTime end)
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144 | {
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145 | return current < end;
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146 | }
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147 |
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148 | protected sealed override List<DateTime> Trim(List<DateTime> ticks, Range<DateTime> range)
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149 | {
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150 | int startIndex = 0;
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151 | for (int i = 0; i < ticks.Count - 1; i++)
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152 | {
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153 | if (ticks[i] <= range.Min && range.Min <= ticks[i + 1])
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154 | {
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155 | startIndex = i;
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156 | break;
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157 | }
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158 | }
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159 |
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160 | int endIndex = ticks.Count - 1;
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161 | for (int i = ticks.Count - 1; i >= 1; i--)
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162 | {
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163 | if (ticks[i] >= range.Max && range.Max > ticks[i - 1])
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164 | {
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165 | endIndex = i;
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166 | break;
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167 | }
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168 | }
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169 |
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170 | List<DateTime> res = new List<DateTime>(endIndex - startIndex + 1);
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171 | for (int i = startIndex; i <= endIndex; i++)
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172 | {
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173 | res.Add(ticks[i]);
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174 | }
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175 |
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176 | return res;
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177 | }
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178 |
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179 | protected sealed override DateTime RoundUp(DateTime start, DateTime end)
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180 | {
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181 | bool isPositive = (end - start).Ticks > 0;
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182 | return isPositive ? SafelyRoundUp(end) : RoundDown(end, Difference);
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183 | }
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184 |
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185 | private DateTime SafelyRoundUp(DateTime dt)
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186 | {
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187 | if (AddStep(dt, 1) == DateTime.MaxValue)
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188 | return DateTime.MaxValue;
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189 |
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190 | return RoundUp(dt, Difference);
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191 | }
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192 |
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193 | protected sealed override DateTime RoundDown(DateTime start, DateTime end)
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194 | {
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195 | bool isPositive = (end - start).Ticks > 0;
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196 | return isPositive ? RoundDown(start, Difference) : SafelyRoundUp(start);
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197 | }
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198 |
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199 | protected sealed override DateTime RoundDown(DateTime time, DifferenceIn diff)
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200 | {
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201 | DateTime res = time;
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202 |
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203 | switch (diff)
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204 | {
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205 | case DifferenceIn.Year:
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206 | res = new DateTime(time.Year, 1, 1);
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207 | break;
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208 | case DifferenceIn.Month:
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209 | res = new DateTime(time.Year, time.Month, 1);
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210 | break;
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211 | case DifferenceIn.Day:
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212 | res = time.Date;
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213 | break;
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214 | case DifferenceIn.Hour:
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215 | res = time.Date.AddHours(time.Hour);
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216 | break;
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217 | case DifferenceIn.Minute:
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218 | res = time.Date.AddHours(time.Hour).AddMinutes(time.Minute);
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219 | break;
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220 | case DifferenceIn.Second:
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221 | res = time.Date.AddHours(time.Hour).AddMinutes(time.Minute).AddSeconds(time.Second);
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222 | break;
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223 | case DifferenceIn.Millisecond:
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224 | res = time.Date.AddHours(time.Hour).AddMinutes(time.Minute).AddSeconds(time.Second).AddMilliseconds(time.Millisecond);
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225 | break;
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226 | default:
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227 | break;
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228 | }
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229 |
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230 | DebugVerify.Is(res <= time);
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231 |
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232 | return res;
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233 | }
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234 |
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235 | protected override DateTime RoundUp(DateTime dateTime, DifferenceIn diff)
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236 | {
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237 | DateTime res = RoundDown(dateTime, diff);
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238 |
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239 | switch (diff)
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240 | {
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241 | case DifferenceIn.Year:
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242 | res = res.AddYears(1);
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243 | break;
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244 | case DifferenceIn.Month:
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245 | res = res.AddMonths(1);
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246 | break;
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247 | case DifferenceIn.Day:
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248 | res = res.AddDays(1);
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249 | break;
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250 | case DifferenceIn.Hour:
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251 | res = res.AddHours(1);
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252 | break;
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253 | case DifferenceIn.Minute:
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254 | res = res.AddMinutes(1);
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255 | break;
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256 | case DifferenceIn.Second:
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257 | res = res.AddSeconds(1);
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258 | break;
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259 | case DifferenceIn.Millisecond:
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260 | res = res.AddMilliseconds(1);
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261 | break;
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262 | default:
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263 | break;
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264 | }
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265 |
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266 | return res;
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267 | }
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268 | }
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269 | }
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