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/*
* Firebird ADO.NET Data provider for .NET and Mono
*
* The contents of this file are subject to the Initial
* Developer's Public License Version 1.0 (the "License");
* you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
* http://www.firebirdsql.org/index.php?op=doc&id=idpl
*
* Software distributed under the License is distributed on
* an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the License for the specific
* language governing rights and limitations under the License.
*
* Copyright (c) 2002, 2005 Carlos Guzman Alvarez
* All Rights Reserved.
*/
using System;
using System.IO;
namespace FirebirdSql.Data.Common
{
/// <summary>
/// Descriptor of query input and output parameters.
/// </summary>
/// <remarks>
/// This is similar to the XSQLDA structure described
/// in the Interbase 6.0 API docs.
/// </remarks>
internal sealed class Descriptor : ICloneable
{
#region Fields
private short version;
private short count;
private short actualCount;
private DbField[] fields;
#endregion
#region Properties
public short Version
{
get
{
return this.version;
}
set
{
this.version = value;
}
}
public short Count
{
get { return this.count; }
}
public short ActualCount
{
get { return this.actualCount; }
set { this.actualCount = value; }
}
#endregion
#region Indexers
public DbField this[int index]
{
get { return this.fields[index]; }
}
#endregion
#region Constructors
public Descriptor(int count)
{
this.version = IscCodes.SQLDA_VERSION1;
this.count = (short)count;
this.actualCount = (short)count;
this.fields = new DbField[count];
for (int i = 0; i < this.fields.Length; i++)
{
this.fields[i] = new DbField();
}
}
#endregion
#region ICloneable Methods
public object Clone()
{
Descriptor descriptor = new Descriptor(this.Count);
descriptor.Version = this.version;
for (int i = 0; i < descriptor.Count; i++)
{
descriptor[i].DataType = this.fields[i].DataType;
descriptor[i].NumericScale = this.fields[i].NumericScale;
descriptor[i].SubType = this.fields[i].SubType;
descriptor[i].Length = this.fields[i].Length;
descriptor[i].Value = this.fields[i].Value;
descriptor[i].NullFlag = this.fields[i].NullFlag;
descriptor[i].Name = this.fields[i].Name;
descriptor[i].Relation = this.fields[i].Relation;
descriptor[i].Owner = this.fields[i].Owner;
descriptor[i].Alias = this.fields[i].Alias;
}
return descriptor;
}
#endregion
#region Methods
public void ResetValues()
{
for (int i = 0; i < this.fields.Length; i++)
{
this.fields[i].Value = null;
}
}
public byte[] ToBlrArray()
{
MemoryStream blr = new MemoryStream();
int par_count = this.Count * 2;
blr.WriteByte(IscCodes.blr_version5);
blr.WriteByte(IscCodes.blr_begin);
blr.WriteByte(IscCodes.blr_message);
blr.WriteByte(0);
blr.WriteByte((byte)(par_count & 255));
blr.WriteByte((byte)(par_count >> 8));
for (int i = 0; i < this.fields.Length; i++)
{
int dtype = this.fields[i].SqlType;
int len = this.fields[i].Length;
switch (dtype)
{
case IscCodes.SQL_VARYING:
blr.WriteByte(IscCodes.blr_varying);
blr.WriteByte((byte)(len & 255));
blr.WriteByte((byte)(len >> 8));
break;
case IscCodes.SQL_TEXT:
blr.WriteByte(IscCodes.blr_text);
blr.WriteByte((byte)(len & 255));
blr.WriteByte((byte)(len >> 8));
break;
case IscCodes.SQL_DOUBLE:
blr.WriteByte(IscCodes.blr_double);
break;
case IscCodes.SQL_FLOAT:
blr.WriteByte(IscCodes.blr_float);
break;
case IscCodes.SQL_D_FLOAT:
blr.WriteByte(IscCodes.blr_d_float);
break;
case IscCodes.SQL_TYPE_DATE:
blr.WriteByte(IscCodes.blr_sql_date);
break;
case IscCodes.SQL_TYPE_TIME:
blr.WriteByte(IscCodes.blr_sql_time);
break;
case IscCodes.SQL_TIMESTAMP:
blr.WriteByte(IscCodes.blr_timestamp);
break;
case IscCodes.SQL_BLOB:
blr.WriteByte(IscCodes.blr_quad);
blr.WriteByte(0);
break;
case IscCodes.SQL_ARRAY:
blr.WriteByte(IscCodes.blr_quad);
blr.WriteByte(0);
break;
case IscCodes.SQL_LONG:
blr.WriteByte(IscCodes.blr_long);
blr.WriteByte((byte)this.fields[i].NumericScale);
break;
case IscCodes.SQL_SHORT:
blr.WriteByte(IscCodes.blr_short);
blr.WriteByte((byte)this.fields[i].NumericScale);
break;
case IscCodes.SQL_INT64:
blr.WriteByte(IscCodes.blr_int64);
blr.WriteByte((byte)this.fields[i].NumericScale);
break;
case IscCodes.SQL_QUAD:
blr.WriteByte(IscCodes.blr_quad);
blr.WriteByte((byte)this.fields[i].NumericScale);
break;
}
blr.WriteByte(IscCodes.blr_short);
blr.WriteByte(0);
}
blr.WriteByte(IscCodes.blr_end);
blr.WriteByte(IscCodes.blr_eoc);
return blr.ToArray();
}
#endregion
}
}
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