SQLStringStorage.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLStringStorage.cs / 1 / SQLStringStorage.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

namespace System.Data.Common { 
    using System;
    using System.Xml;
    using System.Globalization;
    using System.Data.SqlTypes; 
    using System.Diagnostics;
    using System.IO; 
    using System.Xml.Serialization; 
    using System.Collections;
 
    internal sealed class SqlStringStorage : DataStorage {

        private SqlString[] values;
 
        public SqlStringStorage(DataColumn column)
        : base(column, typeof(SqlString), SqlString.Null, SqlString.Null) { 
        } 

        override public Object Aggregate(int[] recordNos, AggregateType kind) { 
            try {
            	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++) { 
                        if (!IsNull(recordNos[i]))
                            count++;
                    }
                    return count; 

                } 
            } 
            catch (OverflowException) {
                throw ExprException.Overflow(typeof(SqlString)); 
            }
            throw ExceptionBuilder.AggregateException(kind, DataType);
        }
 
        override public int Compare(int recordNo1, int recordNo2) {
            return Compare(values[recordNo1], values[recordNo2]); 
        } 

        public int Compare(SqlString valueNo1, SqlString valueNo2) { 

            if (valueNo1.IsNull  && valueNo2.IsNull)
                return 0;
 
            if (valueNo1.IsNull)
                return -1; 
 
            if (valueNo2.IsNull)
                return 1; 

            return Table.Compare(valueNo1.Value, valueNo2.Value);
        }
 
        override public int CompareValueTo(int recordNo, Object value) {
            return Compare(values[recordNo], (SqlString)value); 
        } 

        override public object ConvertValue(object value) { 
            if (null != value) {
                return SqlConvert.ConvertToSqlString(value);
            }
            return NullValue; 
        }
 
        override public void Copy(int recordNo1, int recordNo2) { 
            values[recordNo2] = values[recordNo1];
        } 

        override public Object Get(int record) {
            return values[record];
        } 

        override public int GetStringLength(int record) { 
            SqlString value = values[record]; 
            return ((value.IsNull) ? 0 : value.Value.Length);
        } 

        override public bool IsNull(int record) {
            return (values[record].IsNull);
        } 

        override public void Set(int record, Object value) { 
            values[record] =  SqlConvert.ConvertToSqlString(value); 
        }
 
        override public void SetCapacity(int capacity) {
            SqlString[] newValues = new SqlString[capacity];
            if (null != values) {
                Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); 
            }
            values = newValues; 
        } 

        override public object ConvertXmlToObject(string s) { 
            SqlString newValue = new SqlString();
            string tempStr =string.Concat("", s, ""); // this is done since you can give fragmet to reader, bug 98767
            StringReader strReader = new  StringReader(tempStr);
 
            IXmlSerializable tmp = newValue;
 
            using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) { 
                tmp.ReadXml(xmlTextReader);
            } 
            return ((SqlString)tmp);
        }

        override public string ConvertObjectToXml(object value) { 
            Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here");
            Debug.Assert((value.GetType() == typeof(SqlString)), "wrong input type"); 
 
            StringWriter strwriter = new StringWriter(FormatProvider); // consider passing cultureinfo with CultureInfo.InvariantCulture
 
            using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) {
                ((IXmlSerializable)value).WriteXml(xmlTextWriter);
            }
            return (strwriter.ToString ()); 
        }
 
        override protected object GetEmptyStorage(int recordCount) { 
            return new SqlString[recordCount];
        } 

        override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) {
            SqlString[] typedStore = (SqlString[]) store;
            typedStore[storeIndex] = values[record]; 
            nullbits.Set(storeIndex, IsNull(record));
        } 
 
        override protected void SetStorage(object store, BitArray nullbits) {
            values = (SqlString[]) store; 
            //SetNullStorage(nullbits);
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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SQLStringStorage.cs source code in C# .NET

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