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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Data.Common;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.InteropServices;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;
namespace System.Data.SqlTypes
{
/// <summary>
/// Represents a 16-bit signed integer to be stored in or retrieved from a database.
/// </summary>
[Serializable]
[StructLayout(LayoutKind.Sequential)]
[XmlSchemaProvider("GetXsdType")]
[System.Runtime.CompilerServices.TypeForwardedFrom("System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089")]
public struct SqlInt16 : INullable, IComparable, IXmlSerializable, IEquatable<SqlInt16>
{
private bool m_fNotNull; // false if null. Do not rename (binary serialization)
private short m_value; // Do not rename (binary serialization)
private const int MaskI2 = ~0x00007fff;
// constructor
// construct a Null
private SqlInt16(bool _)
{
m_fNotNull = false;
m_value = 0;
}
public SqlInt16(short value)
{
m_value = value;
m_fNotNull = true;
}
// INullable
public bool IsNull
{
get { return !m_fNotNull; }
}
// property: Value
public short Value
{
get
{
if (m_fNotNull)
return m_value;
else
throw new SqlNullValueException();
}
}
// Implicit conversion from short to SqlInt16
public static implicit operator SqlInt16(short x)
{
return new SqlInt16(x);
}
// Explicit conversion from SqlInt16 to short. Throw exception if x is Null.
public static explicit operator short(SqlInt16 x)
{
return x.Value;
}
public override string ToString()
{
return IsNull ? SQLResource.NullString : m_value.ToString((IFormatProvider)null!);
}
public static SqlInt16 Parse(string s)
{
if (s == SQLResource.NullString)
return SqlInt16.Null;
else
return new SqlInt16(short.Parse(s, null));
}
// Unary operators
public static SqlInt16 operator -(SqlInt16 x)
{
return x.IsNull ? Null : new SqlInt16((short)-x.m_value);
}
public static SqlInt16 operator ~(SqlInt16 x)
{
return x.IsNull ? Null : new SqlInt16((short)~x.m_value);
}
// Binary operators
// Arithmetic operators
public static SqlInt16 operator +(SqlInt16 x, SqlInt16 y)
{
if (x.IsNull || y.IsNull)
return Null;
int iResult = x.m_value + 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);
}
public static SqlInt16 operator -(SqlInt16 x, SqlInt16 y)
{
if (x.IsNull || y.IsNull)
return Null;
int iResult = x.m_value - 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);
}
public static SqlInt16 operator *(SqlInt16 x, SqlInt16 y)
{
if (x.IsNull || y.IsNull)
return Null;
int iResult = x.m_value * y.m_value;
int iTemp = iResult & MaskI2;
if (iTemp != 0 && iTemp != MaskI2)
throw new OverflowException(SQLResource.ArithOverflowMessage);
else
return new SqlInt16((short)iResult);
}
public static SqlInt16 operator /(SqlInt16 x, SqlInt16 y)
{
if (x.IsNull || y.IsNull)
return Null;
if (y.m_value != 0)
{
if ((x.m_value == short.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);
}
public static SqlInt16 operator %(SqlInt16 x, SqlInt16 y)
{
if (x.IsNull || y.IsNull)
return Null;
if (y.m_value != 0)
{
if ((x.m_value == short.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
public static SqlInt16 operator &(SqlInt16 x, SqlInt16 y)
{
return (x.IsNull || y.IsNull) ? Null : new SqlInt16((short)(x.m_value & y.m_value));
}
public static SqlInt16 operator |(SqlInt16 x, SqlInt16 y)
{
return (x.IsNull || y.IsNull) ? Null : new SqlInt16(unchecked((short)((ushort)x.m_value | (ushort)y.m_value)));
}
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
public static explicit operator SqlInt16(SqlBoolean x)
{
return x.IsNull ? Null : new SqlInt16(x.ByteValue);
}
// Implicit conversion from SqlByte to SqlInt16
public static implicit operator SqlInt16(SqlByte x)
{
return x.IsNull ? Null : new SqlInt16(x.Value);
}
// Explicit conversions
// Explicit conversion from SqlInt32 to SqlInt16
public static explicit operator SqlInt16(SqlInt32 x)
{
if (x.IsNull)
return Null;
int value = x.Value;
if (value > short.MaxValue || value < short.MinValue)
throw new OverflowException(SQLResource.ArithOverflowMessage);
else
return new SqlInt16((short)value);
}
// Explicit conversion from SqlInt64 to SqlInt16
public static explicit operator SqlInt16(SqlInt64 x)
{
if (x.IsNull)
return Null;
long value = x.Value;
if (value > short.MaxValue || value < short.MinValue)
throw new OverflowException(SQLResource.ArithOverflowMessage);
else
return new SqlInt16((short)value);
}
// Explicit conversion from SqlSingle to SqlInt16
public static explicit operator SqlInt16(SqlSingle x)
{
if (x.IsNull)
return Null;
float value = x.Value;
if (value < short.MinValue || value > short.MaxValue)
throw new OverflowException(SQLResource.ArithOverflowMessage);
else
return new SqlInt16((short)value);
}
// Explicit conversion from SqlDouble to SqlInt16
public static explicit operator SqlInt16(SqlDouble x)
{
if (x.IsNull)
return Null;
double value = x.Value;
if (value < short.MinValue || value > short.MaxValue)
throw new OverflowException(SQLResource.ArithOverflowMessage);
else
return new SqlInt16((short)value);
}
// Explicit conversion from SqlMoney to SqlInt16
public static explicit operator SqlInt16(SqlMoney x)
{
return x.IsNull ? Null : new SqlInt16(checked((short)x.ToInt32()));
}
// Explicit conversion from SqlDecimal to SqlInt16
public static explicit operator SqlInt16(SqlDecimal x)
{
return (SqlInt16)(SqlInt32)x;
}
// Explicit conversion from SqlString to SqlInt16
public static explicit operator SqlInt16(SqlString x)
{
return x.IsNull ? Null : new SqlInt16(short.Parse(x.Value, null));
}
// Overloading comparison operators
public static SqlBoolean operator ==(SqlInt16 x, SqlInt16 y)
{
return (x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value == y.m_value);
}
public static SqlBoolean operator !=(SqlInt16 x, SqlInt16 y)
{
return !(x == y);
}
public static SqlBoolean operator <(SqlInt16 x, SqlInt16 y)
{
return (x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value < y.m_value);
}
public static SqlBoolean operator >(SqlInt16 x, SqlInt16 y)
{
return (x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value > y.m_value);
}
public static SqlBoolean operator <=(SqlInt16 x, SqlInt16 y)
{
return (x.IsNull || y.IsNull) ? SqlBoolean.Null : new SqlBoolean(x.m_value <= y.m_value);
}
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 this;
}
public SqlInt32 ToSqlInt32()
{
return this;
}
public SqlInt64 ToSqlInt64()
{
return this;
}
public SqlMoney ToSqlMoney()
{
return this;
}
public SqlDecimal ToSqlDecimal()
{
return this;
}
public SqlSingle ToSqlSingle()
{
return 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.
public int CompareTo(object? value)
{
if (value is SqlInt16 i)
{
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
public override bool Equals([NotNullWhen(true)] object? value) =>
value is SqlInt16 other && Equals(other);
/// <summary>Indicates whether the current instance is equal to another instance of the same type.</summary>
/// <param name="other">An instance to compare with this instance.</param>
/// <returns>true if the current instance is equal to the other instance; otherwise, false.</returns>
public bool Equals(SqlInt16 other) =>
other.IsNull || IsNull ? other.IsNull && IsNull :
(this == other).Value;
// For hashing purpose
public override int GetHashCode() => IsNull ? 0 : Value.GetHashCode();
XmlSchema? IXmlSerializable.GetSchema() { return null; }
void IXmlSerializable.ReadXml(XmlReader reader)
{
string? isNull = reader.GetAttribute("nil", XmlSchema.InstanceNamespace);
if (isNull != null && XmlConvert.ToBoolean(isNull))
{
// Read the next value.
reader.ReadElementString();
m_fNotNull = false;
}
else
{
m_value = XmlConvert.ToInt16(reader.ReadElementString());
m_fNotNull = true;
}
}
void IXmlSerializable.WriteXml(XmlWriter writer)
{
if (IsNull)
{
writer.WriteAttributeString("xsi", "nil", XmlSchema.InstanceNamespace, "true");
}
else
{
writer.WriteString(XmlConvert.ToString(m_value));
}
}
public static XmlQualifiedName GetXsdType(XmlSchemaSet schemaSet)
{
return new XmlQualifiedName("short", XmlSchema.Namespace);
}
public static readonly SqlInt16 Null = new SqlInt16(true);
public static readonly SqlInt16 Zero = new SqlInt16(0);
public static readonly SqlInt16 MinValue = new SqlInt16(short.MinValue);
public static readonly SqlInt16 MaxValue = new SqlInt16(short.MaxValue);
} // SqlInt16
} // namespace System.Data.SqlTypes
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