/// <summary>
/// Generate a collection corresponding to the items' dictionary. Spatial and temporal extents
/// are computed. Fields values are summarized in stats object and value sets.
/// All Items are updated with the collection id
/// </summary>
/// <param name="id">Identifier of the collection</param>
/// <param name="description">Description of the collection</param>
/// <param name="items">Dictionary of Uri, StacItem. Uri points to the StacItem destination.</param>
/// <param name="license">License of the collection</param>
/// <param name="collectionUri">Uri of the collection. If provided, the items Uri and made relative to this one.</param>
/// <param name="assets">Assets of the collection</param>
/// <returns></returns>
public static StacCollection Create(string id,
string description,
IDictionary <Uri, StacItem> items,
string license = null,
Uri collectionUri = null,
IDictionary <string, StacAsset> assets = null)
{
var collection = new StacCollection(
id,
description,
StacExtent.Create(items.Values),
assets,
items.Select(item =>
{
Uri itemUri = item.Key;
if (collectionUri != null)
{
itemUri = collectionUri.MakeRelativeUri(item.Key);
}
if (!itemUri.IsAbsoluteUri)
{
itemUri = new Uri("./" + itemUri.OriginalString, UriKind.Relative);
}
return(StacLink.CreateObjectLink(item.Value, itemUri));
}),
license);
var usedExtensions = items.SelectMany(item => item.Value.GetDeclaredExtensions());
var summaryFunctions = usedExtensions.SelectMany(ext => ext.GetSummaryFunctions())
.GroupBy(prop => prop.Key)
.ToDictionary(key => key.Key, value => value.First().Value);
summaryFunctions.Add("gsd", new SummaryFunction <double>(null, "gsd", StacPropertiesContainerExtension.CreateRangeSummaryObject <double>));
summaryFunctions.Add("platform", new SummaryFunction <string>(null, "platform", StacPropertiesContainerExtension.CreateSummaryValueSet <string>));
summaryFunctions.Add("constellation", new SummaryFunction <string>(null, "constellation", StacPropertiesContainerExtension.CreateSummaryValueSet <string>));
summaryFunctions.Add("instruments", new SummaryFunction <string>(null, "instruments", StacPropertiesContainerExtension.CreateSummaryValueSet <string>));
collection.Summaries =
items.Values.SelectMany(item => item.Properties.Where(k => summaryFunctions.Keys.Contains(k.Key)))
.GroupBy(prop => prop.Key)
.ToDictionary(key => key.Key, value =>
{
if (summaryFunctions.ContainsKey(value.Key))
{
if (summaryFunctions[value.Key].Extension != null && !collection.StacExtensions.Contains(summaryFunctions[value.Key].Extension.Identifier))
{
collection.StacExtensions.Add(summaryFunctions[value.Key].Extension.Identifier);
}
return(summaryFunctions[value.Key].Summarize(value.Select(i => i.Value)));
}
return(null);
});
return(collection);
}
/// <summary>
/// Initialize a new Stac Collection from an existing one (clone)
/// </summary>
/// <param name="stacCollection">existing Stac Collection</param>
public StacCollection(StacCollection stacCollection)
{
this.Id = stacCollection.Id;
this.StacExtensions = new SortedSet <string>(stacCollection.StacExtensions);
this.StacVersion = stacCollection.StacVersion;
this.Links = new Collection <StacLink>(stacCollection.Links.ToList());
this.Summaries = new Dictionary <string, Stac.Collection.IStacSummaryItem>(stacCollection.Summaries);
this.Properties = new Dictionary <string, object>(stacCollection.Properties);
this.Assets = new Dictionary <string, StacAsset>(stacCollection.Assets);
this.License = stacCollection.License;
this.Keywords = new Collection <string>(stacCollection.Keywords);
this.Extent = new StacExtent(stacCollection.Extent);
}