1 //------------------------------------------------------------------------------
2 // <copyright file="BooleanStorage.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 BooleanStorage : DataStorage {
17 
18         private const Boolean defaultValue = false;
19 
20         private Boolean[] values;
21 
BooleanStorage(DataColumn column)22         internal BooleanStorage(DataColumn column)
23         : base(column, typeof(Boolean), defaultValue, StorageType.Boolean) {
24         }
25 
Aggregate(int[] records, AggregateType kind)26         override public Object Aggregate(int[] records, AggregateType kind) {
27             bool hasData = false;
28             try {
29                 switch (kind) {
30                     case AggregateType.Min:
31                         Boolean min = true;
32                         for (int i = 0; i < records.Length; i++) {
33                             int record = records[i];
34                             if (IsNull(record))
35                                 continue;
36                             min=values[record] && min;
37                             hasData = true;
38                         }
39                         if (hasData) {
40                             return min;
41                         }
42                         return NullValue;
43 
44                     case AggregateType.Max:
45                         Boolean max = false;
46                         for (int i = 0; i < records.Length; i++) {
47                             int record = records[i];
48                             if (IsNull(record))
49                                 continue;
50                             max=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                 }
68             }
69             catch (OverflowException) {
70                 throw ExprException.Overflow(typeof(Boolean));
71             }
72             throw ExceptionBuilder.AggregateException(kind, DataType);
73         }
74 
Compare(int recordNo1, int recordNo2)75         override public int Compare(int recordNo1, int recordNo2) {
76             Boolean valueNo1 = values[recordNo1];
77             Boolean valueNo2 = values[recordNo2];
78 
79             if (valueNo1 == defaultValue || valueNo2 == defaultValue) {
80                 int bitCheck = CompareBits(recordNo1, recordNo2);
81                 if (0 != bitCheck)
82                     return bitCheck;
83             }
84             return valueNo1.CompareTo(valueNo2);
85             //return ((valueNo1 == valueNo2) ? 0 : ((false == valueNo1) ? -1 : 1)); // similar to Boolean.CompareTo(Boolean)
86         }
87 
CompareValueTo(int recordNo, object value)88         public override int CompareValueTo(int recordNo, object value) {
89             System.Diagnostics.Debug.Assert(0 <= recordNo, "Invalid record");
90             System.Diagnostics.Debug.Assert(null != value, "null value");
91 
92             if (NullValue == value) {
93                 if (IsNull(recordNo)) {
94                     return 0;
95                 }
96                 return 1;
97             }
98 
99             Boolean valueNo1 = values[recordNo];
100             if ((defaultValue == valueNo1) && IsNull(recordNo)) {
101                 return -1;
102             }
103             return valueNo1.CompareTo((Boolean)value);
104             //return ((valueNo1 == valueNo2) ? 0 : ((false == valueNo1) ? -1 : 1)); // similar to Boolean.CompareTo(Boolean)
105         }
106 
ConvertValue(object value)107         public override object ConvertValue(object value) {
108             if (NullValue != value) {
109                 if (null != value) {
110                     value = ((IConvertible)value).ToBoolean(FormatProvider);
111                 }
112                 else {
113                     value = NullValue;
114                 }
115             }
116             return value;
117         }
118 
Copy(int recordNo1, int recordNo2)119         override public void Copy(int recordNo1, int recordNo2) {
120             CopyBits(recordNo1, recordNo2);
121             values[recordNo2] = values[recordNo1];
122         }
123 
Get(int record)124         override public Object Get(int record) {
125             Boolean value = values[record];
126             if (value != defaultValue) {
127                 return value;
128             }
129             return GetBits(record);
130         }
131 
Set(int record, Object value)132         override public void Set(int record, Object value) {
133             System.Diagnostics.Debug.Assert(null != value, "null value");
134             if (NullValue == value) {
135                 values[record] = defaultValue;
136                 SetNullBit(record, true);
137             }
138             else {
139                 values[record] = ((IConvertible)value).ToBoolean(FormatProvider);
140                 SetNullBit(record, false);
141             }
142         }
143 
SetCapacity(int capacity)144          override public void SetCapacity(int capacity) {
145             Boolean[] newValues = new Boolean[capacity];
146             if (null != values) {
147                 Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length));
148             }
149             values = newValues;
150             base.SetCapacity(capacity);
151         }
152 
ConvertXmlToObject(string s)153          override public object ConvertXmlToObject(string s) {
154             return XmlConvert.ToBoolean(s);
155         }
156 
ConvertObjectToXml(object value)157          override public string ConvertObjectToXml(object value) {
158             return XmlConvert.ToString((Boolean) value);
159         }
160 
GetEmptyStorage(int recordCount)161         override protected object GetEmptyStorage(int recordCount) {
162             return new Boolean[recordCount];
163         }
164 
CopyValue(int record, object store, BitArray nullbits, int storeIndex)165         override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
166             Boolean[] typedStore = (Boolean[]) store;
167             typedStore[storeIndex] = values[record];
168             nullbits.Set(storeIndex, IsNull(record));
169         }
170 
SetStorage(object store, BitArray nullbits)171         override protected void SetStorage(object store, BitArray nullbits) {
172             values = (Boolean[]) store;
173             SetNullStorage(nullbits);
174         }
175     }
176 }
177