/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// </summary>
/// <param name="navigationParameter">The parameter value passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
/// </param>
/// <param name="pageState">A dictionary of state preserved by this page during an earlier
/// session. This will be null the first time a page is visited.</param>
protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
_resourceType = navigationParameter as ResourceType;
if (_resourceType == null)
{
var param = navigationParameter as List<object>;
_resourceType = new ResourceType(param[2] as IProvider);
_resourceType.Title = param[0] as string;
DefaultViewModel["ResourceTypeTitle"] = _resourceType.Title;
DefaultViewModel["Instances"] = new ObservableCollection<Resource>();
DefaultViewModel["FilteredInstances"] = new ObservableCollection<Resource>();
LoadQueriedState(new Uri(param[1] as string), _resourceType);
}
else
{
// load instances
DefaultViewModel["ResourceTypeTitle"] = _resourceType.Title;
DefaultViewModel["Instances"] = new ObservableCollection<Resource>();
DefaultViewModel["FilteredInstances"] = new ObservableCollection<Resource>();
var ctx = new object[] { DefaultViewModel["Instances"], DefaultViewModel["FilteredInstances"] };
var t = new Task((c) =>
{
var context = c as object[];
var a = _resourceType.DataProvider.GetResources(_resourceType);
Task.WaitAll(a);
var b = a.Result;
HomePage.UiThreadDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
LoadingMessageTextBlock.Visibility = Visibility.Collapsed;
foreach (var rt in a.Result)
{
(context[0] as ObservableCollection<Resource>).Add(rt);
(context[1] as ObservableCollection<Resource>).Add(rt);
}
});
}, ctx);
t.Start();
LoadingMessageTextBlock.Visibility = Visibility.Visible;
LoadingMessageTextBlock.Text = "Loading...";
}
}
public Resource(IProvider provider, ResourceType type)
{
DataProvider = provider;
Type = type;
// Image = new Uri("http://www.brightstardb.com/images/logo.png";
}
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;
}
private void LoadQueriedState(Uri query, ResourceType type)
{
((ObservableCollection<Resource>)DefaultViewModel["Instances"]).Clear();
((ObservableCollection<Resource>)DefaultViewModel["FilteredInstances"]).Clear();
var ctx = new object[] { DefaultViewModel["Instances"], DefaultViewModel["FilteredInstances"] };
var t = new Task((c) =>
{
var context = c as object[];
var a = _resourceType.DataProvider.GetResources(query, _resourceType);
Task.WaitAll(a);
var b = a.Result;
HomePage.UiThreadDispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
LoadingMessageTextBlock.Visibility = Visibility.Collapsed;
foreach (var rt in a.Result)
{
(context[0] as ObservableCollection<Resource>).Add(rt);
(context[1] as ObservableCollection<Resource>).Add(rt);
}
});
}, ctx);
t.Start();
LoadingMessageTextBlock.Visibility = Visibility.Visible;
LoadingMessageTextBlock.Text = "Loading...";
}
public async Task<List<ResourceType>> GetResourceTypes()
{
try
{
// read service document
var client = new AtomPubClient();
var serviceDoc = await client.RetrieveServiceDocumentAsync(new Uri(_endpoint));
// get workspace 0
var workspace = serviceDoc.Workspaces[0];
// get collections list
var resourceTypes = new List<ResourceType>();
foreach (var collection in workspace.Collections)
{
var rt = new ResourceType(this);
rt.Identity = collection.Uri;
rt.Title = collection.Title.Text;
// check for type annotations
var collectionName = collection.NodeValue;
if (collectionName != null)
{
// get type name from collection name
string typeName;
if (!_collectionToTypeMappings.TryGetValue(collectionName, out typeName))
{
continue;
}
// get type annotations
var annotations = _annotations.Where(a => a.Target.Equals(typeName)).ToList();
if (annotations.Count > 0)
{
// see if we should hide the type
var hideAnnotation = annotations.FirstOrDefault(a => a.Property.Equals(Annotation.Hide));
if (hideAnnotation != null && hideAnnotation.Value.Equals("True"))
{
continue;
}
// try and get a display name
var displayNameAnnotation = annotations.FirstOrDefault(a => a.Property.Equals(Annotation.DisplayName));
if (displayNameAnnotation != null)
{
rt.Title = displayNameAnnotation.Value;
}
// try and get an image
var imageAnnotation = annotations.FirstOrDefault(a => a.Property.Equals(Annotation.ThumbnailUrl));
if (imageAnnotation != null && Uri.IsWellFormedUriString(imageAnnotation.Value, UriKind.Absolute))
{
rt.Image = new Uri(imageAnnotation.Value);
}
}
}
resourceTypes.Add(rt);
}
return resourceTypes;
} catch(Exception ex)
{
return new List<ResourceType>();
}
}