get collection directly from endpoint with APIs

Author: matthewhanson

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Changed
 - Update min PySTAC version to 1.2
 - Default page size limit set to 100 rather than relying on the server default
+- Fetch single collection directly from endpoint in API rather than iterating through children (Issue #114)[https://github.com/stac-utils/pystac-client/issues/114]
 
 ### Added
 

pystac_client/client.py

@@ -87,9 +87,14 @@ def get_collection(self, collection_id: str) -> CollectionClient:
         Returns:
             CollectionClient: A STAC Collection
         """
-        for col in self.get_collections():
-            if col.id == collection_id:
-                return col
+        if self._stac_io.conforms_to(ConformanceClasses.COLLECTIONS):
+            url = f"{self.get_self_href()}/collections/{collection_id}"
+            collection = CollectionClient.from_dict(self._stac_io.read_json(url))
+            return collection
+        else:
+            for col in self.get_collections():
+                if col.id == collection_id:
+                    return col
 
     def get_collections(self) -> Iterable[CollectionClient]:
         """ Get Collections in this Catalog