mirror of
https://github.com/MichaelGrafnetter/DSInternals
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294 lines
12 KiB
C#
294 lines
12 KiB
C#
// ---------------------------------------------------------------------------
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// <copyright file="converter.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// ---------------------------------------------------------------------------
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// ---------------------------------------------------------------------
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// <summary>
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// </summary>
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// ---------------------------------------------------------------------
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namespace Microsoft.Database.Isam
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{
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using System;
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using System.Globalization;
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using System.Text;
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using Microsoft.Isam.Esent.Interop;
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using Microsoft.Isam.Esent.Interop.Vista;
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/// <summary>
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/// Convert an array of Bytes to/from a CLR object, given the type of the underlying column
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/// </summary>
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/// <remarks>
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/// The Interop layer operates with Byte arrays. The Converter class provides methods to convert
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/// an array of bytes retrieved from the Interop layer into a CLR object and to convert a CLR
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/// object into an array of bytes.
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/// </remarks>
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internal class Converter
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{
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/// <summary>
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/// Given a column type and an object, convert the object to an array of bytes
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/// </summary>
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/// <remarks>
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/// This method uses System.Convert and System.BitConverter to do automatic type conversion (e.g. String -> Boolean)
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/// </remarks>
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/// <param name="type">The type of the database column that this object is to be stored in</param>
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/// <param name="isASCII">For text columns, is the column an ASCII column. Ignored for other types</param>
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/// <param name="o">The object to be converted</param>
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/// <returns>An array of bytes representing the object</returns>
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/// <exception cref="InvalidCastException">This conversion is not supported</exception>
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/// <exception cref="ArgumentOutOfRangeException">Unknown column type</exception>
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public static byte[] BytesFromObject(JET_coltyp type, bool isASCII, object o)
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{
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if (o is DBNull)
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{
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return null;
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}
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if (null == o)
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{
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return null;
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}
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switch (type)
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{
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case JET_coltyp.Nil:
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throw new ArgumentOutOfRangeException("type", "Nil is not valid");
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case JET_coltyp.Bit:
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return BitConverter.GetBytes(Convert.ToBoolean(o));
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case JET_coltyp.UnsignedByte:
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byte[] bytes = new byte[1];
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bytes[0] = (byte)o;
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return bytes;
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case JET_coltyp.Short:
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return BitConverter.GetBytes(Convert.ToInt16(o));
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case JET_coltyp.Long:
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return BitConverter.GetBytes(Convert.ToInt32(o));
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case VistaColtyp.LongLong:
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return BitConverter.GetBytes(Convert.ToInt64(o));
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case JET_coltyp.Currency:
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return BitConverter.GetBytes(Convert.ToInt64(o));
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case JET_coltyp.IEEESingle:
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return BitConverter.GetBytes(Convert.ToSingle(o));
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case JET_coltyp.IEEEDouble:
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return BitConverter.GetBytes(Convert.ToDouble(o));
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case VistaColtyp.UnsignedShort:
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return BitConverter.GetBytes(Convert.ToUInt16(o));
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case VistaColtyp.UnsignedLong:
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return BitConverter.GetBytes(Convert.ToUInt32(o));
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case JET_coltyp.Binary:
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return (byte[])o;
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case JET_coltyp.LongBinary:
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return (byte[])o;
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case JET_coltyp.DateTime:
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// Internally DateTime is stored as a double, mapping to a COLEDateTime
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DateTime datetime = Convert.ToDateTime(o);
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double oleDateTime = datetime.ToOADate();
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return BitConverter.GetBytes(oleDateTime);
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case JET_coltyp.Text:
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if (isASCII)
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{
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return Encoding.ASCII.GetBytes(o.ToString());
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}
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else
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{
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return Encoding.Unicode.GetBytes(o.ToString());
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}
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case JET_coltyp.LongText:
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if (isASCII)
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{
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return Encoding.ASCII.GetBytes(o.ToString());
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}
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else
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{
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return Encoding.Unicode.GetBytes(o.ToString());
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}
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case VistaColtyp.GUID:
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if (o is string)
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{
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Guid guid = new Guid((string)o);
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return guid.ToByteArray();
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}
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else if (o is byte[])
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{
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Guid guid = new Guid((byte[])o);
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return guid.ToByteArray();
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}
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else
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{
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// if o isn't a Guid, this will throw an exception
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return ((Guid)o).ToByteArray();
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}
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default:
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throw new ArgumentOutOfRangeException("type", "unknown type");
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}
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}
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/// <summary>
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/// Given a column type and a Byte array, convert the bytes into a CLR object
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/// </summary>
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/// <remarks>
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/// This method uses System.BitConverter to do the conversion
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/// </remarks>
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/// <param name="type">The type of the database column that this bytes were retrieved from</param>
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/// <param name="isASCII">For text columns, is the column an ASCII column. Ignored for other types</param>
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/// <param name="value">The bytes to be converted</param>
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/// <returns>An Object constructed from the bytes or DBNull for a null value</returns>
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/// <exception cref="ArgumentOutOfRangeException">Unknown column type or incorrect Byte array size</exception>
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public static object ObjectFromBytes(JET_coltyp type, bool isASCII, byte[] value)
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{
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if (null == value)
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{
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return DBNull.Value;
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}
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switch (type)
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{
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case JET_coltyp.Nil:
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throw new ArgumentOutOfRangeException("type", "Nil is not valid");
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case JET_coltyp.Bit:
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return BitConverter.ToBoolean(value, 0);
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case JET_coltyp.UnsignedByte:
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return value[0];
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case JET_coltyp.Short:
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return BitConverter.ToInt16(value, 0);
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case JET_coltyp.Long:
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return BitConverter.ToInt32(value, 0);
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case VistaColtyp.LongLong:
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return BitConverter.ToInt64(value, 0);
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case JET_coltyp.Currency:
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return BitConverter.ToInt64(value, 0);
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case JET_coltyp.IEEESingle:
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return BitConverter.ToSingle(value, 0);
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case JET_coltyp.IEEEDouble:
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return BitConverter.ToDouble(value, 0);
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case VistaColtyp.UnsignedShort:
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return BitConverter.ToUInt16(value, 0);
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case VistaColtyp.UnsignedLong:
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return BitConverter.ToUInt32(value, 0);
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case JET_coltyp.Binary:
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return value;
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case JET_coltyp.LongBinary:
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return value;
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case JET_coltyp.Text:
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if (isASCII)
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{
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return new string(Encoding.ASCII.GetChars(value));
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}
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else
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{
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return new string(Encoding.Unicode.GetChars(value));
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}
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case JET_coltyp.LongText:
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if (isASCII)
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{
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return new string(Encoding.ASCII.GetChars(value));
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}
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else
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{
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return new string(Encoding.Unicode.GetChars(value));
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}
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case VistaColtyp.GUID:
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return new Guid(value);
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case JET_coltyp.DateTime:
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// Internally DateTime is stored as a double, mapping to a COLEDateTime
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return DateTime.FromOADate(BitConverter.ToDouble(value, 0));
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default:
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throw new ArgumentOutOfRangeException("type", "unknown type");
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}
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}
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/// <summary>
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/// Converts from <see cref="CompareOptions"/> to <see cref="UnicodeIndexFlags"/>.
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/// </summary>
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/// <param name="options">The value to convert.</param>
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/// <returns>A <see cref="UnicodeIndexFlags"/> value equivalent to <paramref name="options"/>.</returns>
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/// <exception cref="System.ArgumentException">CompareOptions.Ordinal is not supported;compareOptions</exception>
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internal static UnicodeIndexFlags UnicodeFlagsFromCompareOptions(CompareOptions options)
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{
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UnicodeIndexFlags unicodeflags = UnicodeIndexFlags.None;
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if (IsCompareOptionSet(options, CompareOptions.IgnoreCase))
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{
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unicodeflags |= UnicodeIndexFlags.CaseInsensitive;
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}
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if (IsCompareOptionSet(options, CompareOptions.IgnoreKanaType))
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{
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unicodeflags |= UnicodeIndexFlags.KanaInsensitive;
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}
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if (IsCompareOptionSet(options, CompareOptions.IgnoreNonSpace))
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{
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unicodeflags |= UnicodeIndexFlags.AccentInsensitive;
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}
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if (IsCompareOptionSet(options, CompareOptions.IgnoreSymbols))
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{
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unicodeflags |= UnicodeIndexFlags.IgnoreSymbols;
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}
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if (IsCompareOptionSet(options, CompareOptions.IgnoreWidth))
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{
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unicodeflags |= UnicodeIndexFlags.WidthInsensitive;
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}
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if (IsCompareOptionSet(options, CompareOptions.StringSort))
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{
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unicodeflags |= UnicodeIndexFlags.StringSort;
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}
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if (IsCompareOptionSet(options, CompareOptions.Ordinal))
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{
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throw new ArgumentException("CompareOptions.Ordinal is not supported", "compareOptions");
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}
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return unicodeflags;
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}
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/// <summary>
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/// Converts unicodeIndexFlags to a ulong, suitable for dwMapFlags.
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/// </summary>
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/// <param name="unicodeIndexFlags">A UnicodeIndexFlags value.</param>
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/// <returns>A value suitable for calling by LCMapString.</returns>
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internal static uint MapFlagsFromUnicodeIndexFlags(UnicodeIndexFlags unicodeIndexFlags)
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{
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return (uint)unicodeIndexFlags;
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}
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/// <summary>
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/// Converts <see cref="ColumnFlags"/> to a <see cref="ColumndefGrbit"/>, suitable for ESE function calls.
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/// </summary>
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/// <param name="columnFlags">A <see cref="ColumnFlags"/> value.</param>
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/// <returns>A ColumndefGrbit suitable for function calls.</returns>
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internal static ColumndefGrbit ColumndefGrbitFromColumnFlags(ColumnFlags columnFlags)
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{
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return (ColumndefGrbit)columnFlags;
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}
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/// <summary>
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/// Determines whether all of the the specified options in <paramref name="optionsMask"/>
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/// are set in <paramref name="optionsToTest"/>.
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/// </summary>
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/// <param name="optionsToTest">The value to test.</param>
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/// <param name="optionsMask">The optionsMask.</param>
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/// <returns>
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/// Whether all of the the specified options in <paramref name="optionsMask"/>
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/// </returns>
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private static bool IsCompareOptionSet(CompareOptions optionsToTest, CompareOptions optionsMask)
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{
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if ((optionsToTest & optionsMask) == optionsMask)
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{
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return true;
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}
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return false;
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}
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}
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}
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