/// <summary>
/// Builds an instance of an array
/// </summary>
private object BuildArrayInstance(ArrayObjectInfo aoi)
{
// first check if array element type is native (int,short, for example)
var type = OdbType.GetFromName(aoi.GetRealArrayComponentClassName());
var arrayClazz = type.GetNativeClass();
object array = Array.CreateInstance(arrayClazz, aoi.GetArray().Length);
for (var i = 0; i < aoi.GetArrayLength(); i++)
{
var abstractObjectInfo = (AbstractObjectInfo) aoi.GetArray()[i];
if (abstractObjectInfo == null || abstractObjectInfo.IsDeletedObject() || abstractObjectInfo.IsNull())
continue;
var instance = BuildOneInstance(abstractObjectInfo);
((Array) array).SetValue(instance, i);
}
return array;
}
/// <summary>
/// <pre>Write an array to the database
/// This is done by writing :
/// - the array type : array
/// - the array element type (String if it os a String [])
/// - the position of the non native type, if element are non java / C# native
/// - the number of element s and then the position of all elements.
/// </pre>
/// </summary>
/// <remarks>
/// <pre>Write an array to the database
/// This is done by writing :
/// - the array type : array
/// - the array element type (String if it os a String [])
/// - the position of the non native type, if element are non java / C# native
/// - the number of element s and then the position of all elements.
/// Example : an array with two string element : 'ola' and 'chico'
/// write 22 : array
/// write 20 : array of STRING
/// write 0 : it is a java native object
/// write 2 (as an int) : the number of elements
/// write two times 0 (as long) to reserve the space for the elements positions
/// then write the string 'ola', and keeps its position in the 'positions' array of long
/// then write the string 'chico' and keeps its position in the 'positions' array of long
/// Then write back all the positions (in this case , 2 positions) after the size of the array
/// Example : an array with two User element : user1 and user2
/// write 22 : array
/// write 23 : array of NON NATIVE Objects
/// write 251 : if 250 is the position of the user class info in database
/// write 2 (as an int) : the number of elements
/// write two times 0 (as long) to reserve the space for the elements positions
/// then write the user user1, and keeps its position in the 'positions' array of long
/// then write the user user2 and keeps its position in the 'positions' array of long
/// <pre>
/// @param object
/// @param odbType
/// @param position
/// @param writeInTransaction
/// @</pre>
/// </remarks>
private long WriteArray(ArrayObjectInfo aoi, bool writeInTransaction)
{
var startPosition = FileSystemProcessor.FileSystemInterface.GetPosition();
WriteNativeObjectHeader(aoi.GetOdbTypeId(), aoi.IsNull(), BlockTypes.BlockTypeArrayObject,
writeInTransaction);
if (aoi.IsNull())
return startPosition;
var array = aoi.GetArray();
var arraySize = array.Length;
// Writes the fact that it is an array
FileSystemProcessor.FileSystemInterface.WriteString(aoi.GetRealArrayComponentClassName(), writeInTransaction);
// write the size of the array
FileSystemProcessor.FileSystemInterface.WriteInt(arraySize, writeInTransaction);
// build a n array to store all element positions
var attributeIdentifications = new long[arraySize];
// Gets the current position, to know later where to put the
// references
var firstObjectPosition = FileSystemProcessor.FileSystemInterface.GetPosition();
// reserve space for object positions : write 'arraySize' long
// with zero to store each object position
for (var i = 0; i < arraySize; i++)
FileSystemProcessor.FileSystemInterface.WriteLong(0, writeInTransaction); // array element pos
for (var i = 0; i < arraySize; i++)
{
var element = (AbstractObjectInfo) array[i];
if (element == null || element.IsNull())
{
// TODO Check this
attributeIdentifications[i] = StorageEngineConstant.NullObjectIdId;
continue;
}
attributeIdentifications[i] = InternalStoreObjectWrapper(element);
}
var positionAfterWrite = FileSystemProcessor.FileSystemInterface.GetPosition();
// now that all objects have been stored, sets their position in the
// space that have been reserved
FileSystemProcessor.FileSystemInterface.SetWritePosition(firstObjectPosition, writeInTransaction);
for (var i = 0; i < arraySize; i++)
{
FileSystemProcessor.FileSystemInterface.WriteLong(attributeIdentifications[i], writeInTransaction); //array real element pos
}
// Gos back to the end of the array
FileSystemProcessor.FileSystemInterface.SetWritePosition(positionAfterWrite, writeInTransaction);
return startPosition;
}