public async Task<List<Property>> GetResourceProperties(Resource resource)
{
var client = new AtomPubClient();
var res = DataCache.Instance.Lookup<SyndicationItem>(resource.Identity.AbsoluteUri);
if (res == null)
{
res = await client.RetrieveResourceAsync(resource.Identity);
DataCache.Instance.Cache(resource.Identity.AbsoluteUri, res);
}
// process simple properties
var properties = new List<Property>();
if (res.Content.Type.Equals("application/xml"))
{
var xml = res.Content.Xml;
foreach (var cn in xml.FirstChild.ChildNodes)
{
try
{
if (cn.FirstChild == null || cn.FirstChild.NodeValue == null) continue;
var val = cn.FirstChild.NodeValue.ToString();
if (string.IsNullOrEmpty(val)) continue;
var property = new Property(this, null);
property.PropertyName = cn.LocalName.ToString();
property.PropertyValue = val;
property.IsLiteral = true;
if (IsPropertyVisible(resource.Type.Identity.ToString(), property.PropertyName)) properties.Add(property);
}
catch (Exception ex)
{
var msg = ex.Message;
}
}
}
else
{
var propertyElements = res.ElementExtensions;
foreach (var item in propertyElements)
{
if (item.NodeName.ToLower().Equals("properties"))
{
foreach (var prop in item.ElementExtensions)
{
if (string.IsNullOrEmpty(prop.NodeValue)) continue;
if (prop.ElementExtensions.Count > 0)
{
foreach (var innerprop in prop.ElementExtensions)
{
if (string.IsNullOrEmpty(innerprop.NodeValue)) continue;
var property = new Property(this, null)
{
PropertyName = prop.NodeName + innerprop.NodeName,
PropertyValue = innerprop.NodeValue,
IsLiteral = true
};
properties.Add(property);
}
}
else
{
var property = new Property(this, null)
{
PropertyName = prop.NodeName,
PropertyValue = prop.NodeValue,
IsLiteral = true
};
properties.Add(property);
}
}
}
}
}
// process link properties
var links = res.Links.Where(l => l.Relationship.StartsWith(OdataRelationshipRelTypePrefix));
foreach (var syndicationLink in links)
{
// property name
var propertyName = syndicationLink.Relationship.Substring(OdataRelationshipRelTypePrefix.Length);
// need to check if we need to load an entry or a feed
if (syndicationLink.MediaType.ToLower().Contains("type=entry"))
{
try
{
var relatedResource = await client.RetrieveResourceAsync(syndicationLink.Uri);
var property = new Property(this, null)
{
PropertyName = propertyName,
PropertyValue = syndicationLink.Uri.ToString(),
PropertyValueName = relatedResource.Title.Text
};
properties.Add(property);
}
catch (Exception)
{
// sometimes we get bad data from odata services.
}
}
else
{
try
{
AtomPubClient relatedResourceClient = new AtomPubClient();
// always ask for four and show three, if we get four then we can have a show all property.
var entries = await client.RetrieveFeedAsync(new Uri(syndicationLink.Uri.ToString() + "?$top=4"));
foreach (var entry in entries.Items.Take(3))
{
var property = new Property(this, null);
property.PropertyName = propertyName;
property.PropertyValue = entry.EditUri.AbsoluteUri;
property.PropertyValueName = entry.Title.Text;
properties.Add(property);
}
if (entries.Items.Count > 3)
{
var property = new Property(this, null);
property.PropertyName = "";
property.IsCollectionProperty = true;
property.PropertyValue = syndicationLink.Uri.ToString();
property.PropertyValueName = "See all related " + propertyName;
properties.Add(property);
}
}
catch (Exception)
{
}
}
}
return properties;
}
public async Task<List<Resource>> GetResources(Uri collectionUri, ResourceType type)
{
var entries = DataCache.Instance.Lookup<SyndicationFeed>(collectionUri.AbsoluteUri);
if (entries == null)
{
AtomPubClient client = new AtomPubClient();
entries = await client.RetrieveFeedAsync(collectionUri);
DataCache.Instance.Cache(collectionUri.AbsoluteUri, entries);
}
var resources = new List<Resource>();
var resourceIndex = new Dictionary<string, Resource>();
foreach (var entry in entries.Items)
{
var resource = new Resource(this, type);
resource.Identity = new Uri(entry.Id);
resource.Title = entry.Title.Text;
resources.Add(resource);
}
// check for a link to more entries
var nextLink = entries.Links.FirstOrDefault(l => l.Relationship.Equals("next"));
if (nextLink != null)
{
var nextResourceType = new ResourceType(this);
nextResourceType.Identity = new Uri("http://www.brightstardb.com/databrowser/core/next");
var nextResource = new Resource(this, nextResourceType);
nextResource.Identity = nextLink.Uri;
nextResource.Title = "More...";
resources.Add(nextResource);
}
return resources;
}