mcs/class/referencesource/System.Data/System/Data/Common/TimeSpanStorage.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="TimeSpanStorage.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 // <owner current="true" primary="false">Microsoft</owner>
   7 // <owner current="false" primary="false">Microsoft</owner>
   8 //------------------------------------------------------------------------------
   9
  10 namespace System.Data.Common {
  11     using System;
  12     using System.Xml;
  13     using System.Data.SqlTypes;
  14     using System.Collections;
  15
  16     internal sealed class TimeSpanStorage : DataStorage {
  17
  18         private static readonly TimeSpan defaultValue = TimeSpan.Zero;
  19
  20         private TimeSpan[] values;
  21
  22         public TimeSpanStorage(DataColumn column)
  23         : base(column, typeof(TimeSpan), defaultValue, StorageType.TimeSpan) {
  24         }
  25
  26         override public Object Aggregate(int[] records, AggregateType kind) {
  27             bool hasData = false;
  28             try {
  29                 switch (kind) {
  30                     case AggregateType.Min:
  31                         TimeSpan min = TimeSpan.MaxValue;
  32                         for (int i = 0; i < records.Length; i++) {
  33                             int record = records[i];
  34                             if (IsNull(record))
  35                                 continue;
  36                             min=(TimeSpan.Compare(values[record],min) < 0) ? values[record] : min;
  37                             hasData = true;
  38                         }
  39                         if (hasData) {
  40                             return min;
  41                         }
  42                         return NullValue;
  43
  44                     case AggregateType.Max:
  45                         TimeSpan max = TimeSpan.MinValue;
  46                         for (int i = 0; i < records.Length; i++) {
  47                             int record = records[i];
  48                             if (IsNull(record))
  49                                 continue;
  50                             max=(TimeSpan.Compare(values[record],max) >= 0) ? values[record] : max;
  51                             hasData = true;
  52                         }
  53                         if (hasData) {
  54                             return max;
  55                         }
  56                         return NullValue;
  57
  58                     case AggregateType.First:
  59                         if (records.Length > 0) {
  60                             return values[records[0]];
  61                         }
  62                         return null;
  63
  64                     case AggregateType.Count:
  65                         return base.Aggregate(records, kind);
  66
  67                     case AggregateType.Sum: {
  68                             decimal sum = 0;
  69                             foreach (int record in records) {
  70                                 if (IsNull(record))
  71                                     continue;
  72                                 sum += values[record].Ticks;
  73                                 hasData = true;
  74                             }
  75                             if (hasData) {
  76                                 return TimeSpan.FromTicks((long)Math.Round(sum));
  77                             }
  78                             return null;
  79                         }
  80
  81                     case AggregateType.Mean: {
  82                             decimal meanSum = 0;
  83                             int meanCount = 0;
  84                             foreach (int record in records) {
  85                                 if (IsNull(record))
  86                                     continue;
  87                                 meanSum += values[record].Ticks;
  88                                 meanCount++;
  89                             }
  90                             if (meanCount > 0) {
  91                                 return TimeSpan.FromTicks((long)Math.Round(meanSum / meanCount));
  92                             }
  93                             return null;
  94                         }
  95
  96                     case AggregateType.StDev: {
  97                            int count = 0;
  98                             decimal meanSum = 0;
  99
 100                             foreach (int record in records) {
 101                                 if (IsNull(record))
 102                                     continue;
 103                                 meanSum += values[record].Ticks;
 104                                 count++;
 105                             }
 106
 107                             if (count > 1) {
 108                                 double varSum = 0;
 109                                 decimal mean=meanSum/count;
 110                                 foreach (int record in records) {
 111                                     if (IsNull(record))
 112                                         continue;
 113                                     double x = (double)(values[record].Ticks - mean);
 114                                     varSum += x * x;
 115                                 }
 116                                 ulong stDev = (ulong)Math.Round(Math.Sqrt(varSum / (count - 1)));
 117                                 if (stDev > long.MaxValue) {
 118                                     stDev = long.MaxValue;
 119                                 }
 120                                 return TimeSpan.FromTicks((long)stDev);
 121                             }
 122                             return null;
 123                         }
 124                 }
 125             }
 126             catch (OverflowException) {
 127                 throw ExprException.Overflow(typeof(TimeSpan));
 128             }
 129             throw ExceptionBuilder.AggregateException(kind, DataType);
 130         }
 131
 132         override public int Compare(int recordNo1, int recordNo2) {
 133             TimeSpan valueNo1 = values[recordNo1];
 134             TimeSpan valueNo2 = values[recordNo2];
 135
 136             if (valueNo1 == defaultValue || valueNo2 == defaultValue) {
 137                 int bitCheck = CompareBits(recordNo1, recordNo2);
 138                 if (0 != bitCheck)
 139                     return bitCheck;
 140             }
 141             return TimeSpan.Compare(valueNo1, valueNo2);
 142         }
 143
 144         public override int CompareValueTo(int recordNo, object value) {
 145             System.Diagnostics.Debug.Assert(0 <= recordNo, "Invalid record");
 146             System.Diagnostics.Debug.Assert(null != value, "null value");
 147
 148             if (NullValue == value) {
 149                 if (IsNull(recordNo)) {
 150                     return 0;
 151                 }
 152                 return 1;
 153             }
 154
 155             TimeSpan valueNo1 = values[recordNo];
 156             if ((defaultValue == valueNo1) && IsNull(recordNo)) {
 157                 return -1;
 158             }
 159             return valueNo1.CompareTo((TimeSpan)value);
 160         }
 161
 162         private static TimeSpan ConvertToTimeSpan(object value) {
 163             // Webdata 94686: Do not change this checks
 164             Type typeofValue= value.GetType();
 165
 166             if (typeofValue == typeof(string)) {
 167                 return TimeSpan.Parse((string)value);
 168             }
 169             else if (typeofValue == typeof(Int32)) {
 170                 return new TimeSpan((Int64)((Int32)value));
 171             }
 172             else if (typeofValue == typeof(Int64))  {
 173                 return new TimeSpan((Int64)value);
 174             }
 175             else {
 176                 return (TimeSpan) value;
 177             }
 178         }
 179
 180         public override object ConvertValue(object value) {
 181             if (NullValue != value) {
 182                 if (null != value) {
 183                     value = ConvertToTimeSpan(value);
 184                 }
 185                 else {
 186                     value = NullValue;
 187                 }
 188             }
 189             return value;
 190         }
 191
 192
 193         override public void Copy(int recordNo1, int recordNo2) {
 194             CopyBits(recordNo1, recordNo2);
 195             values[recordNo2] = values[recordNo1];
 196         }
 197
 198         override public Object Get(int record) {
 199             TimeSpan value = values[record];
 200             if (value != defaultValue) {
 201                 return value;
 202             }
 203             return GetBits(record);
 204         }
 205
 206         override public void Set(int record, Object value) {
 207             System.Diagnostics.Debug.Assert(null != value, "null value");
 208             if (NullValue == value) {
 209                 values[record] = defaultValue;
 210                 SetNullBit(record, true);
 211             }
 212             else {
 213                 values[record] = ConvertToTimeSpan(value);
 214                 SetNullBit(record, false);
 215             }
 216         }
 217
 218         override public void SetCapacity(int capacity) {
 219             TimeSpan[] newValues = new TimeSpan[capacity];
 220             if (null != values) {
 221                 Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
 222             }
 223             values = newValues;
 224             base.SetCapacity(capacity);
 225         }
 226
 227         override public object ConvertXmlToObject(string s) {
 228             return XmlConvert.ToTimeSpan(s);
 229         }
 230
 231         override public string ConvertObjectToXml(object value) {
 232             return XmlConvert.ToString((TimeSpan)value);
 233         }
 234
 235         override protected object GetEmptyStorage(int recordCount) {
 236             return new TimeSpan[recordCount];
 237         }
 238
 239         override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
 240             TimeSpan[] typedStore = (TimeSpan[]) store;
 241             typedStore[storeIndex] = values[record];
 242             nullbits.Set(storeIndex, IsNull(record));
 243         }
 244
 245         override protected void SetStorage(object store, BitArray nullbits) {
 246             values = (TimeSpan[]) store;
 247             SetNullStorage(nullbits);
 248         }
 249     }
 250 }