SQLInt16.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / SQLTypes / SQLInt16.cs / 1 / SQLInt16.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
// junfang 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

//************************************************************************* 
// @File: SqlInt16.cs
//
// Create by:    JunFang
// 
// Purpose: Implementation of SqlInt16 which is equivalent to
//            data type "smallint" in SQL Server 
// 
// Notes:
// 
// History:
//
//   11/1/99  JunFang    Created.
// 
// @EndHeader@
//************************************************************************* 
 
using System;
using System.Data.Common; 
using System.Runtime.InteropServices;
using System.Globalization;
using System.Xml;
using System.Xml.Schema; 
using System.Xml.Serialization;
 
namespace System.Data.SqlTypes { 

    ///  
    ///    
    ///       Represents a 16-bit signed integer to be stored in
    ///       or retrieved from a database.
    ///     
    /// 
    [Serializable] 
    [StructLayout(LayoutKind.Sequential)] 
    [XmlSchemaProvider("GetXsdType")]
    public struct SqlInt16 : INullable, IComparable, IXmlSerializable { 

        private bool    m_fNotNull; // false if null
        private short   m_value;
 
        private static readonly int O_MASKI2    = ~0x00007fff;
 
        // constructor 
        // construct a Null
        private SqlInt16(bool fNull) { 
            m_fNotNull = false;
            m_value = 0;
        }
 
        /// 
        ///    [To be supplied.] 
        ///  
        public SqlInt16(short value) {
            m_value = value; 
            m_fNotNull = true;
        }

        // INullable 
        /// 
        ///    [To be supplied.] 
        ///  
        public bool IsNull {
            get { return !m_fNotNull;} 
        }

        // property: Value
        ///  
        ///    [To be supplied.]
        ///  
        public short Value { 
            get {
                if (m_fNotNull) 
                    return m_value;
                else
                    throw new SqlNullValueException();
            } 
        }
 
        // Implicit conversion from short to SqlInt16 
        /// 
        ///    [To be supplied.] 
        /// 
        public static implicit operator SqlInt16(short x) {
            return new SqlInt16(x);
        } 

        // Explicit conversion from SqlInt16 to short. Throw exception if x is Null. 
        ///  
        ///    [To be supplied.]
        ///  
        public static explicit operator short(SqlInt16 x) {
            return x.Value;
        }
 
        /// 
        ///    [To be supplied.] 
        ///  
        public override String ToString() {
            return IsNull ? SQLResource.NullString : m_value.ToString((IFormatProvider)null); 
        }

        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlInt16 Parse(String s) { 
            if (s == SQLResource.NullString) 
                return SqlInt16.Null;
            else 
                return new SqlInt16(Int16.Parse(s, (IFormatProvider)null));
        }

 
        // Unary operators
        ///  
        ///    [To be supplied.] 
        /// 
        public static SqlInt16 operator -(SqlInt16 x) { 
            return x.IsNull ? Null : new SqlInt16((short)-x.m_value);
        }

        ///  
        ///    [To be supplied.]
        ///  
        public static SqlInt16 operator ~(SqlInt16 x) { 
            return x.IsNull ? Null : new SqlInt16((short)~x.m_value);
        } 


        // Binary operators
 
        // Arithmetic operators
        ///  
        ///    [To be supplied.] 
        /// 
        public static SqlInt16 operator +(SqlInt16 x, SqlInt16 y) { 
            if (x.IsNull || y.IsNull)
                return Null;

            int iResult = (int)x.m_value + (int)y.m_value; 
            if ((((iResult >> 15) ^ (iResult >> 16)) & 1) != 0) // Bit 15 != bit 16
                throw new OverflowException(SQLResource.ArithOverflowMessage); 
            else 
                return new SqlInt16((short)iResult);
        } 

        /// 
        ///    [To be supplied.]
        ///  
        public static SqlInt16 operator -(SqlInt16 x, SqlInt16 y) {
            if (x.IsNull || y.IsNull) 
                return Null; 

            int iResult = (int)x.m_value - (int)y.m_value; 
            if ((((iResult >> 15) ^ (iResult >> 16)) & 1) != 0) // Bit 15 != bit 16
                throw new OverflowException(SQLResource.ArithOverflowMessage);
            else
                return new SqlInt16((short)iResult); 
        }
 
        ///  
        ///    [To be supplied.]
        ///  
        public static SqlInt16 operator *(SqlInt16 x, SqlInt16 y) {
            if (x.IsNull || y.IsNull)
                return Null;
 
            int iResult = (int)x.m_value * (int)y.m_value;
            int iTemp = iResult & O_MASKI2; 
            if (iTemp != 0 && iTemp != O_MASKI2) 
                throw new OverflowException(SQLResource.ArithOverflowMessage);
            else 
                return new SqlInt16((short)iResult);
        }

        ///  
        ///    [To be supplied.]
        ///  
        public static SqlInt16 operator /(SqlInt16 x, SqlInt16 y) { 
            if (x.IsNull || y.IsNull)
                return Null; 

            if (y.m_value != 0) {
                if ((x.m_value == Int16.MinValue) && (y.m_value == -1))
                    throw new OverflowException(SQLResource.ArithOverflowMessage); 

                return new SqlInt16((short)(x.m_value / y.m_value)); 
            } 
            else
                throw new DivideByZeroException(SQLResource.DivideByZeroMessage); 
        }

        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlInt16 operator %(SqlInt16 x, SqlInt16 y) { 
            if (x.IsNull || y.IsNull) 
                return Null;
 
            if (y.m_value != 0) {
                if ((x.m_value == Int16.MinValue) && (y.m_value == -1))
                    throw new OverflowException(SQLResource.ArithOverflowMessage);
 
                return new SqlInt16((short)(x.m_value % y.m_value));
            } 
            else 
                throw new DivideByZeroException(SQLResource.DivideByZeroMessage);
        } 

        // Bitwise operators
        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlInt16 operator &(SqlInt16 x, SqlInt16 y) { 
            return(x.IsNull || y.IsNull) ? Null : new SqlInt16((short)(x.m_value & y.m_value)); 
        }
 
        /// 
        ///    [To be supplied.]
        /// 
        public static SqlInt16 operator |(SqlInt16 x, SqlInt16 y) { 
            return(x.IsNull || y.IsNull) ? Null : new SqlInt16((short)((ushort)x.m_value | (ushort)y.m_value));
        } 
 
        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlInt16 operator ^(SqlInt16 x, SqlInt16 y) {
            return(x.IsNull || y.IsNull) ? Null : new SqlInt16((short)(x.m_value ^ y.m_value));
        } 

 
 
        // Implicit conversions
 
        // Implicit conversion from SqlBoolean to SqlInt16
        /// 
        ///    [To be supplied.]
        ///  
        public static explicit operator SqlInt16(SqlBoolean x) {
            return x.IsNull ? Null : new SqlInt16((short)(x.ByteValue)); 
        } 

        // Implicit conversion from SqlByte to SqlInt16 
        /// 
        ///    [To be supplied.]
        /// 
        public static implicit operator SqlInt16(SqlByte x) { 
            return x.IsNull ? Null : new SqlInt16((short)(x.Value));
        } 
 
        // Explicit conversions
 
        // Explicit conversion from SqlInt32 to SqlInt16
        /// 
        ///    [To be supplied.]
        ///  
        public static explicit operator SqlInt16(SqlInt32 x) {
            if (x.IsNull) 
                return Null; 

            int value = x.Value; 
            if (value > (int)Int16.MaxValue || value < (int)Int16.MinValue)
                throw new OverflowException(SQLResource.ArithOverflowMessage);
            else
                return new SqlInt16((short)value); 
        }
 
        // Explicit conversion from SqlInt64 to SqlInt16 
        /// 
        ///    [To be supplied.] 
        /// 
        public static explicit operator SqlInt16(SqlInt64 x) {
            if (x.IsNull)
                return Null; 

            long value = x.Value; 
            if (value > (long)Int16.MaxValue || value < (long)Int16.MinValue) 
                throw new OverflowException(SQLResource.ArithOverflowMessage);
            else 
                return new SqlInt16((short)value);
        }

        // Explicit conversion from SqlSingle to SqlInt16 
        /// 
        ///    [To be supplied.] 
        ///  
        public static explicit operator SqlInt16(SqlSingle x) {
            if (x.IsNull) 
                return Null;

            float value = x.Value;
            if (value < (float)Int16.MinValue || value > (float)Int16.MaxValue) 
                throw new OverflowException(SQLResource.ArithOverflowMessage);
            else 
                return new SqlInt16((short)value); 
        }
 
        // Explicit conversion from SqlDouble to SqlInt16
        /// 
        ///    [To be supplied.]
        ///  
        public static explicit operator SqlInt16(SqlDouble x) {
            if (x.IsNull) 
                return Null; 

            double value = x.Value; 
            if (value < (double)Int16.MinValue || value > (double)Int16.MaxValue)
                throw new OverflowException(SQLResource.ArithOverflowMessage);
            else
                return new SqlInt16((short)value); 
        }
 
        // Explicit conversion from SqlMoney to SqlInt16 
        /// 
        ///    [To be supplied.] 
        /// 
        public static explicit operator SqlInt16(SqlMoney x) {
            return x.IsNull ? Null : new SqlInt16(checked((short)x.ToInt32()));
        } 

        // Explicit conversion from SqlDecimal to SqlInt16 
        ///  
        ///    [To be supplied.]
        ///  
        public static explicit operator SqlInt16(SqlDecimal x) {
            return(SqlInt16)(SqlInt32)x;
        }
 
        // Explicit conversion from SqlString to SqlInt16
        ///  
        ///    [To be supplied.] 
        /// 
        public static explicit operator SqlInt16(SqlString x) { 
            return x.IsNull ? Null : new SqlInt16(Int16.Parse(x.Value, (IFormatProvider)null));
        }

        // Overloading comparison operators 
        /// 
        ///    [To be supplied.] 
        ///  
        public static SqlBoolean operator==(SqlInt16 x, SqlInt16 y) {
            return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value == y.m_value); 
        }

        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlBoolean operator!=(SqlInt16 x, SqlInt16 y) { 
            return ! (x == y); 
        }
 
        /// 
        ///    [To be supplied.]
        /// 
        public static SqlBoolean operator<(SqlInt16 x, SqlInt16 y) { 
            return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value < y.m_value);
        } 
 
        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlBoolean operator>(SqlInt16 x, SqlInt16 y) {
            return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value > y.m_value);
        } 

        ///  
        ///    [To be supplied.] 
        /// 
        public static SqlBoolean operator<=(SqlInt16 x, SqlInt16 y) { 
            return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value <= y.m_value);
        }

        ///  
        ///    [To be supplied.]
        ///  
        public static SqlBoolean operator>=(SqlInt16 x, SqlInt16 y) { 
            return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value >= y.m_value);
        } 

        //--------------------------------------------------
        // Alternative methods for overloaded operators
        //-------------------------------------------------- 

        // Alternative method for operator ~ 
        public static SqlInt16 OnesComplement(SqlInt16 x) { 
            return ~x;
        } 

        // Alternative method for operator +
        public static SqlInt16 Add(SqlInt16 x, SqlInt16 y) {
            return x + y; 
        }
        // Alternative method for operator - 
        public static SqlInt16 Subtract(SqlInt16 x, SqlInt16 y) { 
            return x - y;
        } 

        // Alternative method for operator *
        public static SqlInt16 Multiply(SqlInt16 x, SqlInt16 y) {
            return x * y; 
        }
 
        // Alternative method for operator / 
        public static SqlInt16 Divide(SqlInt16 x, SqlInt16 y) {
            return x / y; 
        }

        // Alternative method for operator %
        public static SqlInt16 Mod(SqlInt16 x, SqlInt16 y) { 
            return x % y;
        } 
 
        public static SqlInt16 Modulus(SqlInt16 x, SqlInt16 y) {
            return x % y; 
        }

        // Alternative method for operator &
        public static SqlInt16 BitwiseAnd(SqlInt16 x, SqlInt16 y) { 
            return x & y;
        } 
 
        // Alternative method for operator |
        public static SqlInt16 BitwiseOr(SqlInt16 x, SqlInt16 y) { 
            return x | y;
        }

        // Alternative method for operator ^ 
        public static SqlInt16 Xor(SqlInt16 x, SqlInt16 y) {
            return x ^ y; 
        } 

        // Alternative method for operator == 
        public static SqlBoolean Equals(SqlInt16 x, SqlInt16 y) {
            return (x == y);
        }
 
        // Alternative method for operator !=
        public static SqlBoolean NotEquals(SqlInt16 x, SqlInt16 y) { 
            return (x != y); 
        }
 
        // Alternative method for operator <
        public static SqlBoolean LessThan(SqlInt16 x, SqlInt16 y) {
            return (x < y);
        } 

        // Alternative method for operator > 
        public static SqlBoolean GreaterThan(SqlInt16 x, SqlInt16 y) { 
            return (x > y);
        } 

        // Alternative method for operator <=
        public static SqlBoolean LessThanOrEqual(SqlInt16 x, SqlInt16 y) {
            return (x <= y); 
        }
 
        // Alternative method for operator >= 
        public static SqlBoolean GreaterThanOrEqual(SqlInt16 x, SqlInt16 y) {
            return (x >= y); 
        }

        // Alternative method for conversions.
 
        public SqlBoolean ToSqlBoolean() {
            return (SqlBoolean)this; 
        } 

        public SqlByte ToSqlByte() { 
            return (SqlByte)this;
        }

        public SqlDouble ToSqlDouble() { 
            return (SqlDouble)this;
        } 
 
        public SqlInt32 ToSqlInt32() {
            return (SqlInt32)this; 
        }

        public SqlInt64 ToSqlInt64() {
            return (SqlInt64)this; 
        }
 
        public SqlMoney ToSqlMoney() { 
            return (SqlMoney)this;
        } 

        public SqlDecimal ToSqlDecimal() {
            return (SqlDecimal)this;
        } 

        public SqlSingle ToSqlSingle() { 
            return (SqlSingle)this; 
        }
 
        public SqlString ToSqlString() {
            return (SqlString)this;
        }
 

 
        // IComparable 
        // Compares this object to another object, returning an integer that
        // indicates the relationship. 
        // Returns a value less than zero if this < object, zero if this = object,
        // or a value greater than zero if this > object.
        // null is considered to be less than any instance.
        // If object is not of same type, this method throws an ArgumentException. 
        /// 
        ///    [To be supplied.] 
        ///  
        public int CompareTo(Object value) {
            if (value is SqlInt16) { 
                SqlInt16 i = (SqlInt16)value;

                return CompareTo(i);
            } 
            throw ADP.WrongType(value.GetType(), typeof(SqlInt16));
        } 
 
        public int CompareTo(SqlInt16 value) {
            // If both Null, consider them equal. 
            // Otherwise, Null is less than anything.
            if (IsNull)
                return value.IsNull ? 0  : -1;
            else if (value.IsNull) 
                return 1;
 
            if (this < value) return -1; 
            if (this > value) return 1;
            return 0; 
        }

        // Compares this instance with a specified object
        ///  
        ///    [To be supplied.]
        ///  
        public override bool Equals(Object value) { 
            if (!(value is SqlInt16)) {
                return false; 
            }

            SqlInt16 i = (SqlInt16)value;
 
            if (i.IsNull || IsNull)
                return (i.IsNull && IsNull); 
            else 
                return (this == i).Value;
        } 

        // For hashing purpose
        /// 
        ///    [To be supplied.] 
        /// 
        public override int GetHashCode() { 
            return IsNull ? 0 : Value.GetHashCode(); 
        }
 
        /// 
        ///    [To be supplied.]
        /// 
        XmlSchema IXmlSerializable.GetSchema() { return null; } 

        ///  
        ///    [To be supplied.] 
        /// 
        void IXmlSerializable.ReadXml(XmlReader reader) { 
            string isNull = reader.GetAttribute("nil", XmlSchema.InstanceNamespace);
            if (isNull != null && XmlConvert.ToBoolean(isNull)) {
                m_fNotNull = false;
            } 
            else {
                m_value = XmlConvert.ToInt16(reader.ReadElementString()); 
                m_fNotNull = true; 
            }
        } 

        /// 
        ///    [To be supplied.]
        ///  
        void IXmlSerializable.WriteXml(XmlWriter writer) {
            if (IsNull) { 
                writer.WriteAttributeString("xsi", "nil", XmlSchema.InstanceNamespace, "true"); 
            }
            else { 
                writer.WriteString(XmlConvert.ToString(m_value));
            }
        }
 
        /// 
        ///    [To be supplied.] 
        ///  
        public static XmlQualifiedName GetXsdType(XmlSchemaSet schemaSet) {
            return new XmlQualifiedName("short", XmlSchema.Namespace); 
        }

        /// 
        ///    [To be supplied.] 
        /// 
        public static readonly SqlInt16 Null        = new SqlInt16(true); 
        ///  
        ///    [To be supplied.]
        ///  
        public static readonly SqlInt16 Zero        = new SqlInt16(0);
        /// 
        ///    [To be supplied.]
        ///  
        public static readonly SqlInt16 MinValue    = new SqlInt16(Int16.MinValue);
        ///  
        ///    [To be supplied.] 
        /// 
        public static readonly SqlInt16 MaxValue    = new SqlInt16(Int16.MaxValue); 

    } // SqlInt16

} // namespace System.Data.SqlTypes 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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