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// System.Data.SqlTypes.SqlString
//
// Authors:
// Konstantin Triger <kostat@mainsoft.com>
// Boris Kirzner <borisk@mainsoft.com>
//
// (C) 2005 Mainsoft Corporation (http://www.mainsoft.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
namespace System.Data.SqlTypes
{
using System;
/*
* CURRENT LIMITATIONS:
* 1. constructor public SqlString(String, int) not supported
* 2. constructor public SqlString(int, SqlCompareOption, byte[]) not supported
* 3. constructor public SqlString(String, int, SqlCompareOption) not supported
* 4. constructor public SqlString(int, SqlCompareOption, byte[], boolen) not supported
* 5. constructor public SqlString(int, SqlCompareOption, byte[], boolen) not supported
* 6. constructor public SqlString(int, SqlCompareOption, byte[], int, int) not supported
* 7. field IgnoreKanaType is ignored
* 8. field IgnoreNonSpace is ignored
* 9. field IgnoreWidth is ignored
* 10. any Localeinformation is ignored that is the reson for limitation 1-6
* 11. property CompareInfo not implemented - it relates to the Locale issu
* 12. property CultureInfo not implemented - it relates to the Locale issu
* 12. property LCID not implemented - it relates to the Locale issu
* 13. method GetCompareOptionsFromSqlCompareOptions not implemented - it relates to the Locale issu
* 14. method GetNonUnicodeBytes() - not implemented. Need more information
* 15. method GetUnicodeBytes() - implemented - not sure the right way!!!
*/
public struct SqlString : INullable, IComparable
{
private String _value;
private bool _isNull;
private SqlCompareOptions _compareOptions;
public static readonly SqlString Null = new SqlString();
public static readonly int IgnoreCase = 1;
public static readonly int IgnoreWidth = 16;
public static readonly int IgnoreNonSpace = 2;
public static readonly int IgnoreKanaType = 8;
public static readonly int BinarySort = 32786;
private SqlString(bool isNull)
{
_isNull = isNull;
_value = String.Empty;
_compareOptions = SqlCompareOptions.None;
}
/**
* Initializes a new instance of the SqlString structure using the specified string.
* @param value The string to store.
*/
public SqlString(String value)
{
_value = value;
_isNull = false;
_compareOptions = SqlCompareOptions.None;
}
/**
* Indicates whether or not Value is null.
* @return true if Value is null, otherwise false.
*/
public bool IsNull
{
get
{
return _isNull;
}
}
public SqlCompareOptions CompareOptions
{
get
{
return _compareOptions;
}
}
public String Value
{
get
{
if(IsNull)
{
throw new SqlNullValueException();
}
return _value;
}
}
/**
* Creates a copy of this SqlString object.
* @return A new SqlString object in which all property values are the same as the original.
*/
public SqlString Clone()
{
SqlString clone;
if (_value == null)
clone = new SqlString();
else
clone = new SqlString(_value);
clone._compareOptions = _compareOptions;
return clone;
}
/**
* Compares this instance to the supplied object and returns an indication of their relative values.
* @param obj The object to compare.
* @return A signed number indicating the relative values of the instance and the object.
* Less than zero This instance is less than object.
* Zero This instance is the same as object.
* Greater than zero This instance is greater than object -or-
* object is a null reference.
*/
public int CompareTo(Object obj)
{
if (obj == null)
return 1;
if (Object.ReferenceEquals(obj, this))
return 0;
if (obj is SqlString)
{
SqlString sqlStr = (SqlString)obj;
if (sqlStr._value == null && this._value == null)
return 0;
if (sqlStr._value == null)
return 1;
if (this._value == null)
return -1;
if (_compareOptions == SqlCompareOptions.BinarySort ||
_compareOptions == SqlCompareOptions.None)
return String.Compare(this._value, sqlStr._value);
if (_compareOptions == SqlCompareOptions.IgnoreCase)
return String.Compare(this._value, sqlStr._value, true);
}
throw new ArgumentException("parameter obj is not SqlString : " + obj.GetType().Name);
}
/**
* Concatenates the two specified SqlString structures.
* @param x A SqlString.
* @param y A SqlString.
* @return A SqlString containing the newly concatenated value representing the contents of the two SqlString parameters.
* If any of the parameters or their value equals null the returned value is SqlString.Null.
*/
public static SqlString Concat(SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlString.Null;
return new SqlString(x._value + y._value);
}
// public bool Equals(Object obj)
// {
// if (Object.ReferenceEquals(obj, this))
// return true;
//
// if (obj is SqlString)
// {
// SqlString s = (SqlString)obj;
//
// if (IsNull && s.IsNull)
// return true;
//
// if (IsNull || s.IsNull)
// return false;
//
// return _value.Equals(s._value);
// }
//
// return false;
// }
/**
* Performs a logical comparison on two instances of SqlString to determine if they are equal.
* @param x A SqlString instance.
* @param y A SqlString instance.
* @return true if the two values are equal, otherwise false.
* If one of the parameters is null or null value return SqlBoolean.Null.
*/
public static SqlBoolean Equals(SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
if (x._value.Equals(y._value))
return SqlBoolean.True;
return SqlBoolean.False;
}
public override bool Equals(object obj)
{
if(obj is SqlString)
{
SqlString sqlObj = (SqlString)obj;
if(sqlObj.IsNull && IsNull)
return true;
if(sqlObj.IsNull || IsNull)
return false;
return sqlObj.Value == this.Value;
}
return false;
}
public override int GetHashCode()
{
if(IsNull)
return -1;
return Value.GetHashCode();
}
/**
* Gets an array of bytes, containing the contents of the SqlString in Unicode format.
* @return An byte array, containing the contents of the SqlString in Unicode format.
*/
public byte[] GetUnicodeString()
{
/** @todo check if it works */
if (IsNull)
return null;
return System.Text.Encoding.Default.GetBytes(_value);
}
/**
* Compares two instances of SqlString to determine if the first is greater than the second.
* @param x A SqlString instance
* @param y A SqlString instance
* @return A SqlBoolean that is True if the first instance is greater than the second instance, otherwise False.
* If either instance of SqlString is null, the Value of the SqlBoolean will be Null.
*/
public static SqlBoolean GreaterThan(SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
if (x.CompareTo(y) > 0)
return SqlBoolean.True;
return SqlBoolean.False;
}
/**
* Compares two instances of SqlString to determine if the first is greater than or equal to the second.
* @param x A SqlString instance
* @param y A SqlString instance
* @return A SqlBoolean that is True if the first instance is greaater than or equal to the second instance, otherwise False.
* If either instance of SqlString is null, the Value of the SqlBoolean will be Null.
*/
public static SqlBoolean GreaterThanOrEqual(SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
if (x.CompareTo(y) >= 0)
return SqlBoolean.True;
return SqlBoolean.False;
}
/**
* Compares two instances of SqlString to determine if the first is less than the second.
* @param x A SqlString instance
* @param y A SqlString instance
* @return A SqlBoolean that is True if the first instance is less than the second instance, otherwise False.
* If either instance of SqlString is null, the Value of the SqlBoolean will be Null.
*/
public static SqlBoolean LessThan(SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
if (x.CompareTo(y) < 0)
return SqlBoolean.True;
return SqlBoolean.False;
}
/**
* Compares two instances of SqlString to determine if the first is less than the second.
* @param x A SqlString instance
* @param y A SqlString instance
* @return A SqlBoolean that is True if the first instance is less than the second instance, otherwise False.
* If either instance of SqlString is null, the Value of the SqlBoolean will be Null.
*/
public static SqlBoolean LessThanOrEqual(SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
if (x.CompareTo(y) <= 0)
return SqlBoolean.True;
return SqlBoolean.False;
}
/**
* Compares two instances of SqlString to determine if they are equal.
* @param x A SqlString instance
* @param y A SqlString instance
* @return A SqlBoolean that is True if the two instances are not equal or False if the two instances are equal.
* If either instance of SqlString is null, the Value of the SqlBoolean will be Null.
*/
public static SqlBoolean NotEquals(SqlString x, SqlString y)
{
SqlBoolean res = Equals(x, y);
if (res.IsNull)
return res;
if (res.IsFalse)
return SqlBoolean.True;
return SqlBoolean.False;
}
/**
* Converts this SqlString structure to SqlBoolean.
* @return A SqlBoolean structure whose Value will be True if the SqlString structure's Value is non-zero, False if the SqlString is zero
* and Null if the SqlString structure is Null.
*/
public SqlBoolean ToSqlBoolean()
{
return SqlBoolean.Parse(_value);
}
/**
* Converts this SqlString structure to SqlByte.
* @return A SqlByte structure whose Value equals the Value of this SqlString structure.
*/
public SqlByte ToSqlByte()
{
return SqlByte.Parse(_value);
}
/**
* Converts this SqlString structure to SqlDecimal.
* @return A SqlDecimal structure whose Value equals the Value of this SqlString structure.
*/
public SqlDecimal ToSqlDecimal()
{
return SqlDecimal.Parse(_value);
}
/**
* Converts this SqlString structure to SqlDouble.
* @return A SqlDouble structure whose Value equals the Value of this SqlString structure.
*/
public SqlDouble ToSqlDouble()
{
return SqlDouble.Parse(_value);
}
/**
* Converts this SqlString structure to SqlSingle.
* @return A SqlDouble structure whose Value equals the Value of this SqlString structure.
*/
public SqlSingle ToSqlSingle()
{
return SqlSingle.Parse(_value);
}
/**
* Converts this SqlString structure to SqlDateTime.
* @return A SqlDateTime structure whose Value equals the Value of this SqlString structure.
*/
public SqlDateTime ToSqlDateTime()
{
return SqlDateTime.Parse(_value);
}
/**
* Converts this SqlString structure to SqlInt16.
* @return A SqlInt16 structure whose Value equals the Value of this SqlString structure.
*/
public SqlInt16 ToSqlInt16()
{
return SqlInt16.Parse(_value);
}
/**
* Converts this SqlString structure to SqlInt32.
* @return A SqlInt32 structure whose Value equals the Value of this SqlString structure.
*/
public SqlInt32 ToSqlInt32()
{
return SqlInt32.Parse(_value);
}
/**
* Converts this SqlString structure to SqlInt64.
* @return A SqlInt64 structure whose Value equals the Value of this SqlString structure.
*/
public SqlInt64 ToSqlInt64()
{
return SqlInt64.Parse(_value);
}
/**
* Converts this SqlString instance to SqlString.
* @return A SqlMoney instance whose Value equals the Value of this SqlString instance.
*/
public SqlMoney ToSqlMoney()
{
return SqlMoney.Parse(_value);
}
public override String ToString()
{
if(IsNull)
return "null";
return _value.ToString();
}
// Concatenates
public static SqlString operator + (SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlString.Null;
return new SqlString (x.Value + y.Value);
}
// Equality
public static SqlBoolean operator == (SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
else
return new SqlBoolean (x.Value == y.Value);
}
// Greater Than
public static SqlBoolean operator > (SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
else
return new SqlBoolean (x.CompareTo (y) > 0);
}
// Greater Than Or Equal
public static SqlBoolean operator >= (SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
else
return new SqlBoolean (x.CompareTo (y) >= 0);
}
public static SqlBoolean operator != (SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
else
return new SqlBoolean (x.Value != y.Value);
}
// Less Than
public static SqlBoolean operator < (SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
else
return new SqlBoolean (x.CompareTo (y) < 0);
}
// Less Than Or Equal
public static SqlBoolean operator <= (SqlString x, SqlString y)
{
if (x.IsNull || y.IsNull)
return SqlBoolean.Null;
else
return new SqlBoolean (x.CompareTo (y) <= 0);
}
// **************************************
// Type Conversions
// **************************************
public static explicit operator SqlString (SqlBoolean x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlByte x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlDateTime x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlDecimal x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlDouble x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlGuid x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlInt16 x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlInt32 x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlInt64 x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlMoney x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator SqlString (SqlSingle x)
{
if (x.IsNull)
return Null;
else
return new SqlString (x.Value.ToString ());
}
public static explicit operator string (SqlString x)
{
return x.Value;
}
public static implicit operator SqlString (string x)
{
return new SqlString (x);
}
}}
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