Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,188 @@
+//------------------------------------------------------------------------------
+// <copyright file="StringStorage.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.Diagnostics;
+    using System.Globalization;
+    using System.Data.SqlTypes;
+    using System.Collections;
+
+    // The string storage does not use BitArrays in DataStorage
+    internal sealed class StringStorage : DataStorage {
+
+        private String[] values;
+
+        public StringStorage(DataColumn column)
+        : base(column, typeof(String), String.Empty, StorageType.String) {
+        }
+
+        override public Object Aggregate(int[] recordNos, AggregateType kind) {
+            int i;
+            switch (kind) {
+                case AggregateType.Min:
+                    int min = -1;
+                    for (i = 0; i < recordNos.Length; i++) {
+                        if (IsNull(recordNos[i]))
+                            continue;
+                        min = recordNos[i];
+                        break;
+                    }
+                    if (min >= 0) {
+                        for (i = i+1; i < recordNos.Length; i++) {
+                            if (IsNull(recordNos[i]))
+                                continue;
+                            if (Compare(min, recordNos[i]) > 0) {
+                                min = recordNos[i];
+                            }
+                        }
+                        return Get(min);
+                    }
+                    return NullValue;
+
+                case AggregateType.Max:
+                    int max = -1;
+                    for (i = 0; i < recordNos.Length; i++) {
+                        if (IsNull(recordNos[i]))
+                            continue;
+                        max = recordNos[i];
+                        break;
+                    }
+                    if (max >= 0) {
+                        for (i = i+1; i < recordNos.Length; i++) {
+                            if (Compare(max, recordNos[i]) < 0) {
+                                max = recordNos[i];
+                            }
+                        }
+                        return Get(max);
+                    }
+                    return NullValue;
+
+                case AggregateType.Count:
+                    int count = 0;
+                    for (i = 0; i < recordNos.Length; i++) {
+                        Object value = values[recordNos[i]];
+                        if (value != null)
+                            count++;
+                    }
+                    return count;
+            }
+            throw ExceptionBuilder.AggregateException(kind, DataType);
+        }
+
+        override public int Compare(int recordNo1, int recordNo2) {
+            string valueNo1 = values[recordNo1];
+            string valueNo2 = values[recordNo2];
+
+            if ((Object)valueNo1 == (Object)valueNo2)
+                return 0;
+
+            if (valueNo1 == null)
+                return -1;
+            if (valueNo2 == null)
+                return 1;
+
+            return Table.Compare(valueNo1, valueNo2);
+        }
+
+        override public int CompareValueTo(int recordNo, Object value) {
+            Debug.Assert(recordNo != -1, "Invalid (-1) parameter: 'recordNo'");
+            Debug.Assert(null != value, "null value");
+            string valueNo1 = values[recordNo];
+
+            if (null == valueNo1) {
+                if (NullValue == value) {
+                    return 0;
+                }
+                else {
+                    return -1;
+                }
+            }
+            else if (NullValue == value) {
+                return 1;
+            }
+            return Table.Compare(valueNo1, (string)value);
+        }
+
+        public override object ConvertValue(object value) {
+            if (NullValue != value) {
+                if (null != value) {
+                    value = value.ToString();
+                }
+                else {
+                    value = NullValue;
+                }
+            }
+            return value;
+        }
+
+        override public void Copy(int recordNo1, int recordNo2) {
+            values[recordNo2] = values[recordNo1];
+        }
+
+        override public Object Get(int recordNo) {
+            String value = values[recordNo];
+
+            if (null != value) {
+                return value;
+            }
+            return NullValue;
+        }
+
+        override public int GetStringLength(int record) {
+            string value = values[record];
+            return ((null != value) ? value.Length : 0);
+        }
+
+        override public bool IsNull(int record) {
+            return (null == values[record]);
+        }
+
+        override public void Set(int record, Object value) {
+            System.Diagnostics.Debug.Assert(null != value, "null value");
+            if (NullValue == value) {
+                values[record] = null;
+            }
+            else {
+                values[record] = value.ToString();
+            }
+        }
+
+        override public void SetCapacity(int capacity) {
+            string[] newValues = new string[capacity];
+            if (values != null) {
+                Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
+            }
+            values = newValues;
+        }
+
+        override public object ConvertXmlToObject(string s) {
+            return s;
+        }
+
+        override public string ConvertObjectToXml(object value) {
+            return (string)value;
+        }
+
+        override protected object GetEmptyStorage(int recordCount) {
+            return new String[recordCount];
+        }
+
+        override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
+            String[] typedStore = (String[]) store;
+            typedStore[storeIndex] = values[record];
+            nullbits.Set(storeIndex, IsNull(record));
+        }
+
+        override protected void SetStorage(object store, BitArray nullbits) {
+            values = (String[]) store;
+ //           SetNullStorage(nullbits);
+        }
+    }
+}