public (Dictionary <VersionedAddress, object>, ItemVersion) ProcessContainers(IEnumerable <object> startContainers)
{
var containers = new Dictionary <VersionedAddress, object>();
ItemVersion containerCommonVersion = null;
// Ensure we have the start addresses
if (startContainers != null)
{
foreach (var cont in startContainers)
{
var cVersAddr = new VersionedAddress(System, cont);
if (!containers.ContainsKey(cVersAddr))
{
containers.Add(cVersAddr, cont);
}
else
{
log.Error("Duplicate versioned address: " + cVersAddr.ToString());
}
containerCommonVersion = containerCommonVersion == null ? cVersAddr.Version : containerCommonVersion.LeastAbstractCommonVersion(cVersAddr.Version);
}
}
return(containers, containerCommonVersion);
}
/// <summary>
/// Starting from a list of addresses and optionally (or only) the containers at those addresses, fetch
/// any containers necessary and any other containers required to supply redirected properties for them,
/// obtain the contained content items and collate their properties, returning the content items at the
/// addresses.
/// </summary>
/// <typeparam name="T">Type of content items to return</typeparam>
/// <param name="startContainers">Initial list of containers if they are available</param>
/// <param name="startAddresses">Initial list of addresses, which may be omitted and derived from containers</param>
/// <returns>List of content items</returns>
public IEnumerable <T> Collate <T>(IEnumerable <object> startContainers, IEnumerable <Address> startAddresses) where T : class
{
// place to store all the containers we have currently
var containers = new Dictionary <VersionedAddress, object>();
ItemVersion containerCommonVersion = null;
// Ensure we have the start addresses
if (startContainers != null)
{
containers = startContainers.ToDictionary(sc => new VersionedAddress(sc), sc => sc);
startAddresses = containers.Keys.Select(va => va.Address).Distinct().ToList();
containerCommonVersion = ItemVersion.LeastAbstractCommonVersion(containers.Keys.Select(va => va.Version));
}
var fetchAddrs = startAddresses
.GroupBy(a => a.Type.GetCustomAttributes <RedirectPropertySourceAttribute>())
.SelectMany(ag =>
ag.SelectMany(a => ag.Key
.Select(attr => attr.Redirect(a))
.Concat(a)))
.Distinct()
.Except(containers.Keys.Select(va => va.Address))
.ToList();
bool pushVersion = (startContainers != null);
if (pushVersion) // Get containers in any version that might be relevant to a start container
{
VersionManager.Instance.PushState(VersioningMode.Specific, containerCommonVersion);
}
try
{
// Get all the containers for collation (if current version is not fully specified, may be multiple per address)
foreach (var cont in Repository.Instance.Get(typeof(object), fetchAddrs))
{
var va = new VersionedAddress(cont);
if (containers.ContainsKey(va))
{
log.Error("Duplicate versioned address in db: " + va.ToString());
}
else
{
containers.Add(new VersionedAddress(cont), cont);
}
}
}
finally
{
if (pushVersion)
{
VersionManager.Instance.PopState();
}
}
var contLookup = containers.ToLookup(kvp => kvp.Key.Address.ToString(), kvp => kvp.Value);
if (startContainers == null)
{
startContainers = startAddresses.SelectMany(a => contLookup[a.ToString()]);
}
// We have the data, now collate it into the content from the startContainers
foreach (var addrTypeG in startAddresses.GroupBy(a => a.Type))
{
// Process all the start addresses of a given type
Type contentType = addrTypeG.Key;
var rpsAttributes = contentType
.GetCustomAttributes(typeof(RedirectPropertySourceAttribute), false)
.Cast <RedirectPropertySourceAttribute>()
.ToList();
foreach (var addr in addrTypeG)
{
var primaryPath = addr.GetAsContentPath();
if (!contLookup.Contains(addr.ToString()))
{
continue;
}
foreach (var cont in contLookup[addr.ToString()])
{
object primaryContent = cont;
if (primaryContent is IContentContainer)
{
primaryContent = ((IContentContainer)primaryContent).GetContent();
}
foreach (var rpsAttribute in rpsAttributes)
{
var refAddress = new VersionedAddress(
rpsAttribute.ContentType ?? contentType,
PathFunctions.Redirect(primaryPath, rpsAttribute.SourceDescriptor),
new ItemVersion(cont)
);
if (refAddress.Address == addr) // redirected to itself, ignore
{
continue;
}
object refItem = containers.ContainsKey(refAddress) ? containers[refAddress] : null;
if (refItem is IContentContainer)
{
refItem = ((IContentContainer)refItem).GetContent();
}
if (refItem != null)
{
foreach (string propertyPath in rpsAttribute.PropertyPaths)
{
var toFromPaths = GetPaths(propertyPath);
object val = ReflectionX.GetPropertyValueByPath(refItem, toFromPaths[1]);
var piSet = ReflectionX.GetPropertyByPath(primaryContent.GetType(), toFromPaths[0]);
piSet.SetValue(primaryContent, val);
}
}
}
yield return(primaryContent as T);
}
}
}
}
