refactor: Avoid implicit re-exports in main module

pystac/collection.py

@@ -18,10 +18,11 @@
 import dateutil.parser
 from dateutil import tz
 
-import pystac
-from pystac import STACObjectType, CatalogType
+from pystac.rel_type import RelType
+from pystac.stac_io import StacIO
+from pystac.stac_object import STACObjectType
 from pystac.asset import Asset
-from pystac.catalog import Catalog
+from pystac.catalog import Catalog, CatalogType
 from pystac.layout import HrefLayoutStrategy
 from pystac.link import Link
 from pystac.utils import datetime_to_str
@@ -653,7 +654,7 @@ def clone(self) -> "Collection":
         clone._resolved_objects.cache(clone)
 
         for link in self.links:
-            if link.rel == pystac.RelType.ROOT:
+            if link.rel == RelType.ROOT:
                 # Collection __init__ sets correct root to clone; don't reset
                 # if the root link points to self
                 root_is_self = link.is_resolved() and link.target is self
@@ -721,11 +722,11 @@ def from_dict(
         )
 
         for link in links:
-            if link["rel"] == pystac.RelType.ROOT:
+            if link["rel"] == RelType.ROOT:
                 # Remove the link that's generated in Catalog's constructor.
-                collection.remove_links(pystac.RelType.ROOT)
+                collection.remove_links(RelType.ROOT)
 
-            if link["rel"] != pystac.RelType.SELF or href is None:
+            if link["rel"] != RelType.SELF or href is None:
                 collection.add_link(Link.from_dict(link))
 
         if assets is not None:
@@ -764,12 +765,10 @@ def full_copy(
         return cast(Collection, super().full_copy(root, parent))
 
     @classmethod
-    def from_file(
-        cls, href: str, stac_io: Optional[pystac.StacIO] = None
-    ) -> "Collection":
+    def from_file(cls, href: str, stac_io: Optional[StacIO] = None) -> "Collection":
         result = super().from_file(href, stac_io)
         if not isinstance(result, Collection):
-            raise pystac.STACTypeError(f"{result} is not a {Collection}.")
+            raise STACTypeError(f"{result} is not a {Collection}.")
         return result
 
     @classmethod

pystac/item_collection.py

@@ -2,15 +2,17 @@
 from pystac.errors import STACTypeError
 from typing import Any, Dict, Iterator, List, Optional, Collection, Iterable, Union
 
-import pystac
+from pystac.item import Item
+from pystac.stac_io import StacIO
+from pystac.stac_object import STACObjectType
 from pystac.utils import make_absolute_href, is_absolute_href
 from pystac.serialization.identify import identify_stac_object_type
 
 
-ItemLike = Union[pystac.Item, Dict[str, Any]]
+ItemLike = Union[Item, Dict[str, Any]]
 
 
-class ItemCollection(Collection[pystac.Item]):
+class ItemCollection(Collection[Item]):
     """Implementation of a GeoJSON FeatureCollection whose features are all STAC
     Items.
 
@@ -70,7 +72,7 @@ class ItemCollection(Collection[pystac.Item]):
         # If an item is present in both ItemCollections it will only be added once
     """
 
-    items: List[pystac.Item]
+    items: List[Item]
     """List of :class:`pystac.Item` instances contained in this ``ItemCollection``."""
 
     extra_fields: Dict[str, Any]
@@ -83,20 +85,20 @@ def __init__(
         extra_fields: Optional[Dict[str, Any]] = None,
         clone_items: bool = False,
     ):
-        def map_item(item_or_dict: ItemLike) -> pystac.Item:
+        def map_item(item_or_dict: ItemLike) -> Item:
             # Converts dicts to pystac.Items and clones if necessary
-            if isinstance(item_or_dict, pystac.Item):
+            if isinstance(item_or_dict, Item):
                 return item_or_dict.clone() if clone_items else item_or_dict
             else:
-                return pystac.Item.from_dict(item_or_dict)
+                return Item.from_dict(item_or_dict)
 
         self.items = list(map(map_item, items))
         self.extra_fields = extra_fields or {}
 
-    def __getitem__(self, idx: int) -> pystac.Item:
+    def __getitem__(self, idx: int) -> Item:
         return self.items[idx]
 
-    def __iter__(self) -> Iterator[pystac.Item]:
+    def __iter__(self) -> Iterator[Item]:
         return iter(self.items)
 
     def __len__(self) -> int:
@@ -151,25 +153,23 @@ def from_dict(
             raise STACTypeError("Dict is not a valid ItemCollection")
 
         items = [
-            pystac.Item.from_dict(item, preserve_dict=preserve_dict)
+            Item.from_dict(item, preserve_dict=preserve_dict)
             for item in d.get("features", [])
         ]
         extra_fields = {k: v for k, v in d.items() if k not in ("features", "type")}
 
         return cls(items=items, extra_fields=extra_fields)
 
     @classmethod
-    def from_file(
-        cls, href: str, stac_io: Optional[pystac.StacIO] = None
-    ) -> "ItemCollection":
+    def from_file(cls, href: str, stac_io: Optional[StacIO] = None) -> "ItemCollection":
         """Reads a :class:`ItemCollection` from a JSON file.
 
         Arguments:
             href : Path to the file.
             stac_io : A :class:`~pystac.StacIO` instance to use for file I/O
         """
         if stac_io is None:
-            stac_io = pystac.StacIO.default()
+            stac_io = StacIO.default()
 
         if not is_absolute_href(href):
             href = make_absolute_href(href)
@@ -181,7 +181,7 @@ def from_file(
     def save_object(
         self,
         dest_href: str,
-        stac_io: Optional[pystac.StacIO] = None,
+        stac_io: Optional[StacIO] = None,
     ) -> None:
         """Saves this instance to the ``dest_href`` location.
 
@@ -191,7 +191,7 @@ def save_object(
                 will use the default instance.
         """
         if stac_io is None:
-            stac_io = pystac.StacIO.default()
+            stac_io = StacIO.default()
 
         stac_io.save_json(dest_href, self.to_dict())
 
@@ -217,6 +217,6 @@ def is_item_collection(d: Dict[str, Any]) -> bool:
         # Prior to STAC 0.9 ItemCollections did not have a stac_version field and could
         #  only be identified by the fact that all of their 'features' are STAC Items.
         return all(
-            identify_stac_object_type(feature) == pystac.STACObjectType.ITEM
+            identify_stac_object_type(feature) == STACObjectType.ITEM
             for feature in d.get("features", [])
         )