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//------------------------------------------------------------------------------
// <copyright file="SqlDouble.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">junfang</owner>
// <owner current="true" primary="false">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
//**************************************************************************
// @File: SqlDouble.cs
//
// Create by: JunFang
//
// Purpose: Implementation of SqlDouble which is equivalent to
// data type "float" in SQL Server
//
// Notes:
//
// History:
//
// 09/17/99 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 {
/// <devdoc>
/// <para>
/// Represents a floating-point number within the range of
/// -1.79E
/// +308 through 1.79E +308 to be stored in or retrieved from
/// a database.
/// </para>
/// </devdoc>
[Serializable]
[StructLayout(LayoutKind.Sequential)]
[XmlSchemaProvider("GetXsdType")]
public struct SqlDouble : INullable, IComparable, IXmlSerializable {
private bool m_fNotNull; // false if null
private double m_value;
// constructor
// construct a Null
private SqlDouble(bool fNull) {
m_fNotNull = false;
m_value = 0.0;
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public SqlDouble(double value) {
if (Double.IsInfinity(value) || Double.IsNaN(value))
throw new OverflowException(SQLResource.ArithOverflowMessage);
else {
m_value = value;
m_fNotNull = true;
}
}
// INullable
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public bool IsNull {
get { return !m_fNotNull;}
}
// property: Value
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public double Value {
get {
if (m_fNotNull)
return m_value;
else
throw new SqlNullValueException();
}
}
// Implicit conversion from double to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(double x) {
return new SqlDouble(x);
}
// Explicit conversion from SqlDouble to double. Throw exception if x is Null.
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static explicit operator double(SqlDouble x) {
return x.Value;
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public override String ToString() {
return IsNull ? SQLResource.NullString : m_value.ToString((IFormatProvider)null);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlDouble Parse(String s) {
if (s == SQLResource.NullString)
return SqlDouble.Null;
else
return new SqlDouble(Double.Parse(s, CultureInfo.InvariantCulture));
}
// Unary operators
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlDouble operator -(SqlDouble x) {
return x.IsNull ? Null : new SqlDouble(-x.m_value);
}
// Binary operators
// Arithmetic operators
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlDouble operator +(SqlDouble x, SqlDouble y) {
if (x.IsNull || y.IsNull)
return Null;
double value = x.m_value + y.m_value;
if (Double.IsInfinity(value))
throw new OverflowException(SQLResource.ArithOverflowMessage);
return new SqlDouble(value);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlDouble operator -(SqlDouble x, SqlDouble y) {
if (x.IsNull || y.IsNull)
return Null;
double value = x.m_value - y.m_value;
if (Double.IsInfinity(value))
throw new OverflowException(SQLResource.ArithOverflowMessage);
return new SqlDouble(value);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlDouble operator *(SqlDouble x, SqlDouble y) {
if (x.IsNull || y.IsNull)
return Null;
double value = x.m_value * y.m_value;
if (Double.IsInfinity(value))
throw new OverflowException(SQLResource.ArithOverflowMessage);
return new SqlDouble(value);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlDouble operator /(SqlDouble x, SqlDouble y) {
if (x.IsNull || y.IsNull)
return Null;
if (y.m_value == (double)0.0)
throw new DivideByZeroException(SQLResource.DivideByZeroMessage);
double value = x.m_value / y.m_value;
if (Double.IsInfinity(value))
throw new OverflowException(SQLResource.ArithOverflowMessage);
return new SqlDouble(value);
}
// Implicit conversions
// Implicit conversion from SqlBoolean to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static explicit operator SqlDouble(SqlBoolean x) {
return x.IsNull ? Null : new SqlDouble((double)(x.ByteValue));
}
// Implicit conversion from SqlByte to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(SqlByte x) {
return x.IsNull ? Null : new SqlDouble((double)(x.Value));
}
// Implicit conversion from SqlInt16 to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(SqlInt16 x) {
return x.IsNull ? Null : new SqlDouble((double)(x.Value));
}
// Implicit conversion from SqlInt32 to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(SqlInt32 x) {
return x.IsNull ? Null : new SqlDouble((double)(x.Value));
}
// Implicit conversion from SqlInt64 to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(SqlInt64 x) {
return x.IsNull ? Null : new SqlDouble((double)(x.Value));
}
// Implicit conversion from SqlSingle to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(SqlSingle x) {
return x.IsNull ? Null : new SqlDouble((double)(x.Value));
}
// Implicit conversion from SqlMoney to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(SqlMoney x) {
return x.IsNull ? Null : new SqlDouble(x.ToDouble());
}
// Implicit conversion from SqlDecimal to SqlDouble
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static implicit operator SqlDouble(SqlDecimal x) {
return x.IsNull ? Null : new SqlDouble(x.ToDouble());
}
// Explicit conversions
// Explicit conversion from SqlString to SqlDouble
// Throws FormatException or OverflowException if necessary.
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static explicit operator SqlDouble(SqlString x) {
if (x.IsNull)
return SqlDouble.Null;
return Parse(x.Value);
}
// Overloading comparison operators
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlBoolean operator==(SqlDouble x, SqlDouble y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value == y.m_value);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlBoolean operator!=(SqlDouble x, SqlDouble y) {
return ! (x == y);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlBoolean operator<(SqlDouble x, SqlDouble y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value < y.m_value);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlBoolean operator>(SqlDouble x, SqlDouble y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value > y.m_value);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlBoolean operator<=(SqlDouble x, SqlDouble y) {
return(x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value <= y.m_value);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static SqlBoolean operator>=(SqlDouble x, SqlDouble 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 SqlDouble Add(SqlDouble x, SqlDouble y) {
return x + y;
}
// Alternative method for operator -
public static SqlDouble Subtract(SqlDouble x, SqlDouble y) {
return x - y;
}
// Alternative method for operator *
public static SqlDouble Multiply(SqlDouble x, SqlDouble y) {
return x * y;
}
// Alternative method for operator /
public static SqlDouble Divide(SqlDouble x, SqlDouble y) {
return x / y;
}
// Alternative method for operator ==
public static SqlBoolean Equals(SqlDouble x, SqlDouble y) {
return (x == y);
}
// Alternative method for operator !=
public static SqlBoolean NotEquals(SqlDouble x, SqlDouble y) {
return (x != y);
}
// Alternative method for operator <
public static SqlBoolean LessThan(SqlDouble x, SqlDouble y) {
return (x < y);
}
// Alternative method for operator >
public static SqlBoolean GreaterThan(SqlDouble x, SqlDouble y) {
return (x > y);
}
// Alternative method for operator <=
public static SqlBoolean LessThanOrEqual(SqlDouble x, SqlDouble y) {
return (x <= y);
}
// Alternative method for operator >=
public static SqlBoolean GreaterThanOrEqual(SqlDouble x, SqlDouble y) {
return (x >= y);
}
// Alternative method for conversions.
public SqlBoolean ToSqlBoolean() {
return (SqlBoolean)this;
}
public SqlByte ToSqlByte() {
return (SqlByte)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 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.
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public int CompareTo(Object value) {
if (value is SqlDouble) {
SqlDouble i = (SqlDouble)value;
return CompareTo(i);
}
throw ADP.WrongType(value.GetType(), typeof(SqlDouble));
}
public int CompareTo(SqlDouble 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
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public override bool Equals(Object value) {
if (!(value is SqlDouble)) {
return false;
}
SqlDouble i = (SqlDouble)value;
if (i.IsNull || IsNull)
return (i.IsNull && IsNull);
else
return (this == i).Value;
}
// For hashing purpose
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public override int GetHashCode() {
return IsNull ? 0 : Value.GetHashCode();
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
XmlSchema IXmlSerializable.GetSchema() { return null; }
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
void IXmlSerializable.ReadXml(XmlReader reader) {
string isNull = reader.GetAttribute("nil", XmlSchema.InstanceNamespace);
if (isNull != null && XmlConvert.ToBoolean(isNull)) {
// VSTFDevDiv# 479603 - SqlTypes read null value infinitely and never read the next value. Fix - Read the next value.
reader.ReadElementString();
m_fNotNull = false;
}
else {
m_value = XmlConvert.ToDouble(reader.ReadElementString());
m_fNotNull = true;
}
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
void IXmlSerializable.WriteXml(XmlWriter writer) {
if (IsNull) {
writer.WriteAttributeString("xsi", "nil", XmlSchema.InstanceNamespace, "true");
}
else {
writer.WriteString(XmlConvert.ToString(m_value));
}
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static XmlQualifiedName GetXsdType(XmlSchemaSet schemaSet) {
return new XmlQualifiedName("double", XmlSchema.Namespace);
}
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static readonly SqlDouble Null = new SqlDouble(true);
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static readonly SqlDouble Zero = new SqlDouble(0.0);
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static readonly SqlDouble MinValue = new SqlDouble(Double.MinValue);
/// <devdoc>
/// <para>[To be supplied.]</para>
/// </devdoc>
public static readonly SqlDouble MaxValue = new SqlDouble(Double.MaxValue);
} // SqlDouble
} // namespace System.Data.SqlTypes
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