/// <summary>
/// Save the contents of a POF user type instance by writing its
/// state using the specified <see cref="IPofWriter"/> object.
/// </summary>
/// <param name="writer">
/// The <b>IPofWriter</b> to which to write the object's state.
/// </param>
/// <exception cref="IOException">
/// If an I/O error occurs.
/// </exception>
public virtual void WriteExternal(IPofWriter writer)
{
// note: this object is not responsible for writing out its parent
object o = m_value;
if (o == null)
{
writer.WriteByte(0, 0);
}
else if (o is string)
{
writer.WriteByte(0, (byte)XmlValueType.String);
writer.WriteString(1, (string)o);
}
else if (o is bool)
{
writer.WriteByte(0, (byte)XmlValueType.Boolean);
writer.WriteBoolean(1, (bool)o);
}
else if (o is int)
{
writer.WriteByte(0, (byte)XmlValueType.Integer);
writer.WriteInt32(1, (int)o);
}
else if (o is long)
{
writer.WriteByte(0, (byte)XmlValueType.Long);
writer.WriteInt64(1, (long)o);
}
else if (o is double)
{
writer.WriteByte(0, (byte)XmlValueType.Double);
writer.WriteDouble(1, (Double)o);
}
else if (o is decimal)
{
writer.WriteByte(0, (byte )XmlValueType.Decimal);
writer.WriteDecimal(1, (decimal)o);
}
else if (o is Binary)
{
writer.WriteByte(0, (byte)XmlValueType.Binary);
writer.WriteBinary(1, (Binary)o);
}
else if (o is DateTime)
{
writer.WriteByte(0, (byte)XmlValueType.DateTime);
writer.WriteDateTime(1, (DateTime)o);
}
else
{
throw new IOException("unsupported type to write: " + o.GetType().FullName);
}
writer.WriteBoolean(2, m_isAttribute);
writer.WriteBoolean(3, m_isMutable);
}