SQLSingle.cs source code in C# .NET

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                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / SQLTypes / SQLSingle.cs / 1 / SQLSingle.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
//  
// junfang 
// [....]
// [....] 
//----------------------------------------------------------------------------- 

//************************************************************************* 
// @File: SqlSingle.cs
//
// Create by:    JunFang
// 
// Purpose: Implementation of SqlSingle which is equivalent to
//            data type "real" in SQL Server 
// 
// Notes:
// 
// History:
//
//   1/30/2000  JunFang        Created and implemented as first drop.
// 
// @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 floating point number within the range of -3.40E +38 through
    ///       3.40E +38 to be stored in or retrieved from a database.
    ///     
    /// 
    [StructLayout(LayoutKind.Sequential)] 
    [Serializable] 
    [XmlSchemaProvider("GetXsdType")]
    public struct SqlSingle : INullable, IComparable, IXmlSerializable { 
        private bool m_fNotNull; // false if null
        private float m_value;
        // constructor
        // construct a Null 
        private SqlSingle(bool fNull) {
            m_fNotNull = false; 
            m_value = (float)0.0; 
        }
 
        /// 
        ///    [To be supplied.]
        /// 
        public SqlSingle(float value) { 
            if (Single.IsInfinity(value) || Single.IsNaN(value))
                throw new OverflowException(SQLResource.ArithOverflowMessage); 
            else { 
                m_fNotNull = true;
                m_value = value; 
            }
        }

        ///  
        ///    [To be supplied.]
        ///  
        public SqlSingle(double value) : this(checked((float)value)) { 
        }
 
        // INullable
        /// 
        ///    [To be supplied.]
        ///  
        public bool IsNull {
            get { return !m_fNotNull;} 
        } 

        // property: Value 
        /// 
        ///    [To be supplied.]
        /// 
        public float Value { 
            get {
                if (m_fNotNull) 
                    return m_value; 
                else
                    throw new SqlNullValueException(); 
            }
        }

        // Implicit conversion from float to SqlSingle 
        /// 
        ///    [To be supplied.] 
        ///  
        public static implicit operator SqlSingle(float x) {
            return new SqlSingle(x); 
        }

        // Explicit conversion from SqlSingle to float. Throw exception if x is Null.
        ///  
        ///    [To be supplied.]
        ///  
        public static explicit operator float(SqlSingle 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 SqlSingle Parse(String s) {
            if (s == SQLResource.NullString) 
                return SqlSingle.Null;
            else 
                return new SqlSingle(Single.Parse(s, CultureInfo.InvariantCulture)); 
        }
 

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

        // Binary operators

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

            float value = x.m_value + y.m_value;
 
            if (Single.IsInfinity(value))
                throw new OverflowException(SQLResource.ArithOverflowMessage); 
 
            return new SqlSingle(value);
        } 

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

            float value = x.m_value - y.m_value; 

            if (Single.IsInfinity(value))
                throw new OverflowException(SQLResource.ArithOverflowMessage);
 
            return new SqlSingle(value);
        } 
 
        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlSingle operator *(SqlSingle x, SqlSingle y) {
            if (x.IsNull || y.IsNull)
                return Null; 

            float value = x.m_value * y.m_value; 
 
            if (Single.IsInfinity(value))
                throw new OverflowException(SQLResource.ArithOverflowMessage); 

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

            if (y.m_value == (float)0.0)
                throw new DivideByZeroException(SQLResource.DivideByZeroMessage); 

            float value = x.m_value / y.m_value; 
 
            if (Single.IsInfinity(value))
                throw new OverflowException(SQLResource.ArithOverflowMessage); 

            return new SqlSingle(value);
        }
 

 
        // Implicit conversions 

        // Implicit conversion from SqlBoolean to SqlSingle 
        /// 
        ///    [To be supplied.]
        /// 
        public static explicit operator SqlSingle(SqlBoolean x) { 
            return x.IsNull ? Null : new SqlSingle(x.ByteValue);
        } 
 
        // Implicit conversion from SqlByte to SqlSingle
        ///  
        ///    [To be supplied.]
        /// 
        public static implicit operator SqlSingle(SqlByte x) {
            // Will not overflow 
            return x.IsNull ? Null : new SqlSingle((float)(x.Value));
        } 
 
        // Implicit conversion from SqlInt16 to SqlSingle
        ///  
        ///    [To be supplied.]
        /// 
        public static implicit operator SqlSingle(SqlInt16 x) {
            // Will not overflow 
            return x.IsNull ? Null : new SqlSingle((float)(x.Value));
        } 
 
        // Implicit conversion from SqlInt32 to SqlSingle
        ///  
        ///    [To be supplied.]
        /// 
        public static implicit operator SqlSingle(SqlInt32 x) {
            // Will not overflow 
            return x.IsNull ? Null : new SqlSingle((float)(x.Value));
        } 
 
        // Implicit conversion from SqlInt64 to SqlSingle
        ///  
        ///    [To be supplied.]
        /// 
        public static implicit operator SqlSingle(SqlInt64 x) {
            // Will not overflow 
            return x.IsNull ? Null : new SqlSingle((float)(x.Value));
        } 
 
        // Implicit conversion from SqlMoney to SqlSingle
        ///  
        ///    [To be supplied.]
        /// 
        public static implicit operator SqlSingle(SqlMoney x) {
            return x.IsNull ? Null : new SqlSingle(x.ToDouble()); 
        }
 
        // Implicit conversion from SqlDecimal to SqlSingle 
        /// 
        ///    [To be supplied.] 
        /// 
        public static implicit operator SqlSingle(SqlDecimal x) {
            // Will not overflow
            return x.IsNull ? Null : new SqlSingle(x.ToDouble()); 
        }
 
 
        // Explicit conversions
 

        // Explicit conversion from SqlDouble to SqlSingle
        /// 
        ///    [To be supplied.] 
        /// 
        public static explicit operator SqlSingle(SqlDouble x) { 
            return x.IsNull ? Null : new SqlSingle(x.Value); 
        }
 
        // Explicit conversion from SqlString to SqlSingle
        // Throws FormatException or OverflowException if necessary.
        /// 
        ///    [To be supplied.] 
        /// 
        public static explicit operator SqlSingle(SqlString x) { 
            if (x.IsNull) 
                return SqlSingle.Null;
            return Parse(x.Value); 
        }

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

        /// 
        ///    [To be supplied.]
        ///  
        public static SqlBoolean operator!=(SqlSingle x, SqlSingle y) {
            return ! (x == y); 
        } 

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

        /// 
        ///    [To be supplied.] 
        /// 
        public static SqlBoolean operator>=(SqlSingle x, SqlSingle 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 SqlSingle Add(SqlSingle x, SqlSingle y) { 
            return x + y; 
        }
        // Alternative method for operator - 
        public static SqlSingle Subtract(SqlSingle x, SqlSingle y) {
            return x - y;
        }
 
        // Alternative method for operator *
        public static SqlSingle Multiply(SqlSingle x, SqlSingle y) { 
            return x * y; 
        }
 
        // Alternative method for operator /
        public static SqlSingle Divide(SqlSingle x, SqlSingle y) {
            return x / y;
        } 

        // Alternative method for operator == 
        public static SqlBoolean Equals(SqlSingle x, SqlSingle y) { 
            return (x == y);
        } 

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

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

        // Alternative method for operator >= 
        public static SqlBoolean GreaterThanOrEqual(SqlSingle x, SqlSingle 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 SqlInt16 ToSqlInt16() {
            return (SqlInt16)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 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 SqlSingle) {
                SqlSingle i = (SqlSingle)value; 
 
                return CompareTo(i);
            } 
            throw ADP.WrongType(value.GetType(), typeof(SqlSingle));
        }

        public int CompareTo(SqlSingle 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 SqlSingle)) { 
                return false;
            } 
 
            SqlSingle i = (SqlSingle)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.ToSingle(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("float", XmlSchema.Namespace);
        } 
 
        /// 
        ///    [To be supplied.] 
        /// 
        public static readonly SqlSingle Null       = new SqlSingle(true);
        /// 
        ///    [To be supplied.] 
        /// 
        public static readonly SqlSingle Zero       = new SqlSingle((float)0.0); 
        ///  
        ///    [To be supplied.]
        ///  
        public static readonly SqlSingle MinValue   = new SqlSingle(Single.MinValue);
        /// 
        ///    [To be supplied.]
        ///  
        public static readonly SqlSingle MaxValue   = new SqlSingle(Single.MaxValue);
 
    } // SqlSingle 

} // 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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