246 lines
9.3 KiB
C#
246 lines
9.3 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="UInt32Storage.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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// <owner current="true" primary="false">[....]</owner>
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// <owner current="false" primary="false">[....]</owner>
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//------------------------------------------------------------------------------
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namespace System.Data.Common {
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using System;
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using System.Xml;
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using System.Data.SqlTypes;
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using System.Collections;
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internal sealed class UInt32Storage : DataStorage {
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private static readonly UInt32 defaultValue = UInt32.MinValue;
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private UInt32[] values;
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public UInt32Storage(DataColumn column)
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: base(column, typeof(UInt32), defaultValue, StorageType.UInt32) {
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}
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override public Object Aggregate(int[] records, AggregateType kind) {
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bool hasData = false;
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try {
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switch (kind) {
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case AggregateType.Sum:
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UInt64 sum = defaultValue;
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foreach (int record in records) {
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if (HasValue(record)) {
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checked { sum += (UInt64) values[record];}
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hasData = true;
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}
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}
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if (hasData) {
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return sum;
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}
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return NullValue;
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case AggregateType.Mean:
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Int64 meanSum = (Int64)defaultValue;
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int meanCount = 0;
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foreach (int record in records) {
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if (HasValue(record)) {
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checked { meanSum += (Int64)values[record];}
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meanCount++;
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hasData = true;
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}
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}
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if (hasData) {
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UInt32 mean;
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checked {mean = (UInt32)(meanSum / meanCount);}
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return mean;
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}
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return NullValue;
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case AggregateType.Var:
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case AggregateType.StDev:
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int count = 0;
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double var = 0.0f;
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double prec = 0.0f;
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double dsum = 0.0f;
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double sqrsum = 0.0f;
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foreach (int record in records) {
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if (HasValue(record)) {
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dsum += (double)values[record];
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sqrsum += (double)values[record]*(double)values[record];
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count++;
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}
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}
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if (count > 1) {
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var = ((double)count * sqrsum - (dsum * dsum));
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prec = var / (dsum * dsum);
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// we are dealing with the risk of a cancellation error
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// double is guaranteed only for 15 digits so a difference
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// with a result less than 1e-15 should be considered as zero
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if ((prec < 1e-15) || (var <0))
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var = 0;
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else
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var = var / (count * (count -1));
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if (kind == AggregateType.StDev) {
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return Math.Sqrt(var);
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}
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return var;
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}
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return NullValue;
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case AggregateType.Min:
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UInt32 min = UInt32.MaxValue;
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for (int i = 0; i < records.Length; i++) {
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int record = records[i];
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if (HasValue(record)) {
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min=Math.Min(values[record], min);
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hasData = true;
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}
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}
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if (hasData) {
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return min;
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}
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return NullValue;
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case AggregateType.Max:
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UInt32 max = UInt32.MinValue;
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for (int i = 0; i < records.Length; i++) {
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int record = records[i];
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if (HasValue(record)) {
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max=Math.Max(values[record], max);
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hasData = true;
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}
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}
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if (hasData) {
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return max;
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}
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return NullValue;
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case AggregateType.First:
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if (records.Length > 0) {
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return values[records[0]];
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}
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return null;
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case AggregateType.Count:
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count = 0;
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for (int i = 0; i < records.Length; i++) {
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if (HasValue(records[i]))
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count++;
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}
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return count;
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}
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}
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catch (OverflowException) {
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throw ExprException.Overflow(typeof(UInt32));
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}
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throw ExceptionBuilder.AggregateException(kind, DataType);
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}
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override public int Compare(int recordNo1, int recordNo2) {
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UInt32 valueNo1 = values[recordNo1];
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UInt32 valueNo2 = values[recordNo2];
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if (valueNo1 == defaultValue || valueNo2 == defaultValue) {
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int bitCheck = CompareBits(recordNo1, recordNo2);
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if (0 != bitCheck) {
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return bitCheck;
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}
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}
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//return valueNo1.CompareTo(valueNo2);
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return(valueNo1 < valueNo2 ? -1 : (valueNo1 > valueNo2 ? 1 : 0)); // similar to UInt32.CompareTo(UInt32)
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}
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public override int CompareValueTo(int recordNo, object value) {
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System.Diagnostics.Debug.Assert(0 <= recordNo, "Invalid record");
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System.Diagnostics.Debug.Assert(null != value, "null value");
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if (NullValue == value) {
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return (HasValue(recordNo) ? 1 : 0);
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}
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UInt32 valueNo1 = values[recordNo];
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if ((defaultValue == valueNo1) && !HasValue(recordNo)) {
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return -1;
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}
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return valueNo1.CompareTo((UInt32)value);
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//return(valueNo1 < valueNo2 ? -1 : (valueNo1 > valueNo2 ? 1 : 0)); // similar to UInt32.CompareTo(UInt32)
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}
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public override object ConvertValue(object value) {
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if (NullValue != value) {
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if (null != value) {
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value = ((IConvertible)value).ToUInt32(FormatProvider);
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}
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else {
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value = NullValue;
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}
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}
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return value;
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}
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override public void Copy(int recordNo1, int recordNo2) {
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CopyBits(recordNo1, recordNo2);
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values[recordNo2] = values[recordNo1];
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}
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override public Object Get(int record) {
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UInt32 value = values[record];
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if (!value.Equals(defaultValue)) {
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return value;
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}
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return GetBits(record);
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}
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override public void Set(int record, Object value) {
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System.Diagnostics.Debug.Assert(null != value, "null value");
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if (NullValue == value) {
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values[record] = defaultValue;
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SetNullBit(record, true);
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}
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else {
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values[record] = ((IConvertible)value).ToUInt32(FormatProvider);
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SetNullBit(record, false);
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}
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}
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override public void SetCapacity(int capacity) {
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UInt32[] newValues = new UInt32[capacity];
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if (null != values) {
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Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
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}
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values = newValues;
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base.SetCapacity(capacity);
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}
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override public object ConvertXmlToObject(string s) {
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return XmlConvert.ToUInt32(s);
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}
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override public string ConvertObjectToXml(object value) {
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return XmlConvert.ToString((UInt32)value);
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}
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override protected object GetEmptyStorage(int recordCount) {
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return new UInt32[recordCount];
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}
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override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
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UInt32[] typedStore = (UInt32[]) store;
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typedStore[storeIndex] = values[record];
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nullbits.Set(storeIndex, !HasValue(record));
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}
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override protected void SetStorage(object store, BitArray nullbits) {
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values = (UInt32[]) store;
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SetNullStorage(nullbits);
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}
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}
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}
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