Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,242 @@
+//------------------------------------------------------------------------------
+// <copyright file="SByteStorage.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+// <owner current="true" primary="false">[....]</owner>
+// <owner current="false" primary="false">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Data.Common {
+    using System;
+    using System.Xml;
+    using System.Data.SqlTypes;
+    using System.Collections;
+
+    internal sealed class SByteStorage : DataStorage {
+
+        private const SByte defaultValue = 0;
+
+        private SByte[] values;
+
+        public SByteStorage(DataColumn column)
+        : base(column, typeof(SByte), defaultValue, StorageType.SByte) {
+        }
+
+        override public Object Aggregate(int[] records, AggregateType kind) {
+            bool hasData = false;
+            try {
+                switch (kind) {
+                    case AggregateType.Sum:
+                        Int64 sum = defaultValue;
+                        foreach (int record in records) {
+                            if (IsNull(record))
+                                continue;
+                            checked { sum += values[record];}
+                            hasData = true;
+                        }
+                        if (hasData) {
+                            return sum;
+                        }
+                        return NullValue;
+
+                    case AggregateType.Mean:
+                        Int64 meanSum = (Int64)defaultValue;
+                        int meanCount = 0;
+                        foreach (int record in records) {
+                            if (IsNull(record))
+                                continue;
+                            checked { meanSum += (Int64)values[record];}
+                            meanCount++;
+                            hasData = true;
+                        }
+                        if (hasData) {
+                            SByte mean;
+                            checked {mean = (SByte)(meanSum / meanCount);}
+                            return mean;
+                        }
+                        return NullValue;
+
+                    case AggregateType.Var:
+                    case AggregateType.StDev:
+                        int count = 0;
+                        double var = (double)defaultValue;
+                        double prec = (double)defaultValue;
+                        double dsum = (double)defaultValue;
+                        double sqrsum = (double)defaultValue;
+
+                        foreach (int record in records) {
+                            if (IsNull(record))
+                                continue;
+                            dsum += (double)values[record];
+                            sqrsum += (double)values[record]*(double)values[record];
+                            count++;
+                        }
+
+                        if (count > 1) {
+                            var = ((double)count * sqrsum - (dsum * dsum));
+                            prec = var / (dsum * dsum);
+
+                            // we are dealing with the risk of a cancellation error
+                            // double is guaranteed only for 15 digits so a difference
+                            // with a result less than 1e-15 should be considered as zero
+
+                            if ((prec < 1e-15) || (var <0))
+                                var = 0;
+                            else
+                                var = var / (count * (count -1));
+
+                            if (kind == AggregateType.StDev) {
+                                return Math.Sqrt(var);
+                            }
+                            return var;
+                        }
+                        return NullValue;
+
+                    case AggregateType.Min:
+                        SByte min = SByte.MaxValue;
+                        for (int i = 0; i < records.Length; i++) {
+                            int record = records[i];
+                            if (IsNull(record))
+                                continue;
+                            min=Math.Min(values[record], min);
+                            hasData = true;
+                        }
+                        if (hasData) {
+                            return min;
+                        }
+                        return NullValue;
+
+                    case AggregateType.Max:
+                        SByte max = SByte.MinValue;
+                        for (int i = 0; i < records.Length; i++) {
+                            int record = records[i];
+                            if (IsNull(record))
+                                continue;
+                            max=Math.Max(values[record], max);
+                            hasData = true;
+                        }
+                        if (hasData) {
+                            return max;
+                        }
+                        return NullValue;
+
+                    case AggregateType.First:
+                        if (records.Length > 0) {
+                            return values[records[0]];
+                        }
+                        return null;
+
+                    case AggregateType.Count:
+                        return base.Aggregate(records, kind);
+
+                }
+            }
+            catch (OverflowException) {
+                throw ExprException.Overflow(typeof(SByte));
+            }
+            throw ExceptionBuilder.AggregateException(kind, DataType);
+        }
+
+        override public int Compare(int recordNo1, int recordNo2) {
+            SByte valueNo1 = values[recordNo1];
+            SByte valueNo2 = values[recordNo2];
+
+            if (valueNo1.Equals(defaultValue) || valueNo2.Equals(defaultValue)) {
+                int bitCheck = CompareBits(recordNo1, recordNo2);
+                if (0 != bitCheck)
+                    return bitCheck;
+            }
+            return valueNo1.CompareTo(valueNo2);
+            //return(valueNo1 - valueNo2); // copied from SByte.CompareTo(SByte)
+        }
+
+        public override int CompareValueTo(int recordNo, object value) {
+            System.Diagnostics.Debug.Assert(0 <= recordNo, "Invalid record");
+            System.Diagnostics.Debug.Assert(null != value, "null value");
+
+            if (NullValue == value) {
+                if (IsNull(recordNo)) {
+                    return 0;
+                }
+                return 1;
+            }
+
+            SByte valueNo1 = values[recordNo];
+            if ((defaultValue == valueNo1) && IsNull(recordNo)) {
+                return -1;
+            }
+            return valueNo1.CompareTo((SByte)value);
+            //return(valueNo1 - valueNo2); // copied from SByte.CompareTo(SByte)
+        }
+
+        public override object ConvertValue(object value) {
+            if (NullValue != value) {
+                if (null != value) {
+                    value = ((IConvertible)value).ToSByte(FormatProvider);
+                }
+                else {
+                    value = NullValue;
+                }
+            }
+            return value;
+        }
+
+        override public void Copy(int recordNo1, int recordNo2) {
+            CopyBits(recordNo1, recordNo2);
+            values[recordNo2] = values[recordNo1];
+        }
+
+        override public Object Get(int record) {
+            SByte value = values[record];
+            if (!value.Equals(defaultValue)) {
+                return value;
+            }
+            return GetBits(record);
+        }
+
+        override public void Set(int record, Object value) {
+            System.Diagnostics.Debug.Assert(null != value, "null value");
+            if (NullValue == value) {
+                values[record] = defaultValue;
+                SetNullBit(record, true);
+            }
+            else {
+                values[record] = ((IConvertible)value).ToSByte(FormatProvider);
+                SetNullBit(record, false);
+            }
+        }
+
+        override public void SetCapacity(int capacity) {
+            SByte[] newValues = new SByte[capacity];
+            if (null != values) {
+                Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
+            }
+            values = newValues;
+            base.SetCapacity(capacity);
+        }
+
+        override public object ConvertXmlToObject(string s) {
+            return XmlConvert.ToSByte(s);
+        }
+
+        override public string ConvertObjectToXml(object value) {
+            return XmlConvert.ToString((SByte)value);
+        }
+
+        override protected object GetEmptyStorage(int recordCount) {
+            return new SByte[recordCount];
+        }
+
+        override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
+            SByte[] typedStore = (SByte[]) store;
+            typedStore[storeIndex] = values[record];
+            nullbits.Set(storeIndex, IsNull(record));
+        }
+
+        override protected void SetStorage(object store, BitArray nullbits) {
+            values = (SByte[]) store;
+            SetNullStorage(nullbits);
+        }
+    }
+}