/// <summary>
/// Get the existing sync state for this item, if it exists and is of the appropriate
/// type, else null.
/// </summary>
/// <remarks>Outlook items are not true objects and don't have a common superclass,
/// so we have to use this rather clumsy overloading.</remarks>
/// <param name="appointment">The item.</param>
/// <returns>The appropriate sync state, or null if none.</returns>
/// <exception cref="UnexpectedSyncStateClassException">if the sync state found is not of the expected class (shouldn't happen).</exception>
public AppointmentSyncState GetSyncState(Outlook.AppointmentItem appointment)
{
SyncState result;
try
{
result = (appointment.IsValid() && this.byOutlookId.ContainsKey(appointment.EntryID)) ? this.byOutlookId[appointment.EntryID] : null;
CrmId crmId = result == null?appointment.GetCrmId() : CheckForDuplicateSyncState(result, appointment.GetCrmId());
if (CrmId.IsValid(crmId))
{
if (result == null && this.byCrmId.ContainsKey(crmId))
{
result = this.byCrmId[crmId];
}
else if (result != null && this.byCrmId.ContainsKey(crmId) == false)
{
this.byCrmId[crmId] = result;
result.CrmEntryId = crmId;
}
}
if (result != null && !(result is AppointmentSyncState))
{
throw new UnexpectedSyncStateClassException("AppointmentSyncState", result);
}
}
catch (COMException)
{
// dead item passed.
result = null;
}
return(result as AppointmentSyncState);
}
/// <summary>
/// Get the CRM id for this item, if known, else the empty string.
/// </summary>
/// <param name="olItem">The Outlook item under consideration.</param>
/// <returns>the CRM id for this item, if known, else null.</returns>
public static CrmId GetCrmId(this Outlook.AppointmentItem olItem)
{
string result;
if (olItem.IsValid())
{
try
{
Outlook.UserProperty property = olItem.UserProperties[SyncStateManager.CrmIdPropertyName];
if (property == null)
{
/* #6661: fail over to legacy property name if current property
* name not found */
property = olItem.UserProperties[SyncStateManager.LegacyCrmIdPropertyName];
}
if (property != null && !string.IsNullOrEmpty(property.Value))
{
result = property.Value;
}
else
{
result = olItem.GetVCalId();
}
}
catch (COMException)
{
/* this is bad! It shouldn't be possible to get here, but
* it is. */
try
{
result = olItem.GetVCalId();
}
catch (COMException)
{
result = null;
}
}
}
else
{
result = null;
}
return(CrmId.Get(result));
}