// TODO : remove parameter itemType if generic constraints allow internal and parameterized constructors.
// Parameter itemType is used as a workaround to instanciate a VolumeItem object,
// because the internal VolumeItem constructor with the database parameter can't be used in generic code.
// see http://lab.msdn.microsoft.com/productfeedback/viewfeedback.aspx?feedbackid=9a8e58ee-1371-4e99-8385-c3e2a4157fd6
// see http://lab.msdn.microsoft.com/productfeedback/viewfeedback.aspx?feedbackid=80517ec1-2d08-43cc-bc90-9927877061a9
/// <summary>
/// Returns a specific VolumeItem object, but preassigns properties of the VolumeItem baseclass only.
/// Filling properties of the specific, derived object, is job of the specific VolumeScanner implementation.
/// </summary>
/// <typeparam name="TVolumeItem">Type of the specific volume item.</typeparam>
/// <returns>
/// A new specific VolumeItem derived from base class VolumeItem
/// with all base class properties preassigned.
/// </returns>
protected TVolumeItem GetNewVolumeItem <TVolumeItem>(long parentID,
string name,
string mimeType,
MetadataStore metaData,
VolumeItemType itemType)
where TVolumeItem : VolumeItem
{
// TODO: check here if TMediaItem applies to TMedia?
/* TVolumeItem item = new TVolumeItem(database); */
TVolumeItem item = (TVolumeItem)VolumeItem.CreateInstance(itemType, database);
// initialize fields of the VolumeItem base class.
// don't initialize via properties. initializing via properties is error-prone
// as the compiler won't error if a new field is added to the base class
// and forgotten to be initialized here.
item.SetVolumeItemFields(volume.VolumeID,
itemID,
parentID,
name,
mimeType,
metaData,
null,
null);
itemID++;
return(item);
}
internal static VolumeItem CreateInstance(VolumeItemType type, VolumeDatabase database)
{
VolumeItem item = null;
switch (type)
{
case VolumeItemType.DirectoryVolumeItem:
item = new DirectoryVolumeItem(database);
break;
case VolumeItemType.FileVolumeItem:
item = new FileVolumeItem(database);
break;
case VolumeItemType.AudioCdRootVolumeItem:
item = new AudioCdRootVolumeItem(database);
break;
case VolumeItemType.AudioTrackVolumeItem:
item = new AudioTrackVolumeItem(database);
break;
default:
throw new NotImplementedException(string.Format("Instantiation of type {0} is not implemented", type.ToString()));
}
return(item);
}
internal FileSystemVolumeItem(VolumeDatabase database, VolumeItemType volumeItemType)
: base(database, volumeItemType)
{
this.location = null;
//this.createdDate = DateTime.MinValue;
this.lastWriteTime = DateTime.MinValue;
this.symLinkTargetID = VolumeDatabase.ID_NONE;
}
internal FileSystemVolumeItem(VolumeDatabase database, VolumeItemType volumeItemType)
: base(database, volumeItemType)
{
this.location = null;
//this.createdDate = DateTime.MinValue;
this.lastWriteTime = DateTime.MinValue;
this.symLinkTargetID = VolumeDatabase.ID_NONE;
}
public static ItemEditor CreateInstance(VolumeItemType itemType)
{
switch (itemType)
{
case VolumeItemType.FileVolumeItem:
return(new FileItemEditor());
case VolumeItemType.DirectoryVolumeItem:
return(new DirectoryItemEditor());
case VolumeItemType.AudioTrackVolumeItem:
return(new AudioTrackItemEditor());
default:
throw new NotImplementedException(string.Format("ItemEditor widget for VolumeItemType {0} is not implemented", itemType.ToString()));
}
}
internal VolumeItem(VolumeDatabase database, VolumeItemType itemType)
: base(tableName, primarykeyFields)
{
this.volumeID = 0L;
this.itemID = 0L;
//this.rootID = 0L;
this.parentID = 0L;
this.name = null;
this.mimeType = null;
this.metaData = MetadataStore.Empty;
this.note = null;
this.keywords = null;
//this.ownerVolume = null;
this.database = database;
this.itemType = itemType;
}
internal VolumeItem(VolumeDatabase database, VolumeItemType itemType)
: base(tableName, primarykeyFields)
{
this.volumeID = 0L;
this.itemID = 0L;
//this.rootID = 0L;
this.parentID = 0L;
this.name = null;
this.mimeType = null;
this.metaData = MetadataStore.Empty;
this.note = null;
this.keywords = null;
//this.ownerVolume = null;
this.database = database;
this.itemType = itemType;
}
internal static VolumeItem CreateInstance(VolumeItemType type, VolumeDatabase database)
{
VolumeItem item = null;
switch (type) {
case VolumeItemType.DirectoryVolumeItem:
item = new DirectoryVolumeItem(database);
break;
case VolumeItemType.FileVolumeItem:
item = new FileVolumeItem(database);
break;
case VolumeItemType.AudioCdRootVolumeItem:
item = new AudioCdRootVolumeItem(database);
break;
case VolumeItemType.AudioTrackVolumeItem:
item = new AudioTrackVolumeItem(database);
break;
default:
throw new NotImplementedException(string.Format("Instantiation of type {0} is not implemented", type.ToString()));
}
return item;
}
