4 files changed, 35 insertions, 2 deletions
diff --git a/bsie/base/extractor.py b/bsie/base/extractor.py
index 7acf2bd..2fc4f18 100644
--- a/bsie/base/extractor.py
+++ b/bsie/base/extractor.py
@@ -63,6 +63,13 @@ class Extractor(abc.ABC):
     def __repr__(self) -> str:
         return f'{typename(self)}()'
 
+    def __eq__(self, other: typing.Any) -> bool:
+        return isinstance(other, type(self)) \
+          and self.CONTENT_READER == other.CONTENT_READER \
+          and self.schema == other.schema
+
+    def __hash__(self) -> int:
+        return hash((type(self), self.CONTENT_READER, self.schema))
 
     def predicates(self) -> typing.Iterator[_schema.Predicate]:
         """Return the predicates that may be part of extracted triples."""
diff --git a/bsie/base/reader.py b/bsie/base/reader.py
index e59abef..b7eabf7 100644
--- a/bsie/base/reader.py
+++ b/bsie/base/reader.py
@@ -32,6 +32,12 @@ class Reader(abc.ABC):
     def __repr__(self) -> str:
         return f'{typename(self)}()'
 
+    def __eq__(self, other: typing.Any) -> bool:
+        return isinstance(other, type(self))
+
+    def __hash__(self) -> int:
+        return hash(type(self))
+
     @abc.abstractmethod
     def __call__(self, path: URI) -> typing.Any:
         """Return some content of the file at *path*.
diff --git a/bsie/extractor/generic/constant.py b/bsie/extractor/generic/constant.py
index 795bac6..7da792a 100644
--- a/bsie/extractor/generic/constant.py
+++ b/bsie/extractor/generic/constant.py
@@ -38,6 +38,12 @@ class Constant(extractor.Extractor):
         self._tuples = tuple((self.schema.predicate(p_uri), value) for p_uri, value in tuples)
         # FIXME: use schema instance for value checking
 
+    def __eq__(self, other: typing.Any) -> bool:
+        return super().__eq__(other) \
+           and self._tuples == other._tuples
+
+    def __hash__(self) -> int:
+        return hash((super().__hash__(), self._tuples))
 
     def extract(
             self,
diff --git a/bsie/utils/node.py b/bsie/utils/node.py
index 3a0f06b..c9c494f 100644
--- a/bsie/utils/node.py
+++ b/bsie/utils/node.py
@@ -7,8 +7,8 @@ Author: Matthias Baumgartner, 2022
 # imports
 import typing
 
-# inner-module imports
-from bsie.utils.bsfs import URI
+# bsie imports
+from bsie.utils.bsfs import URI, typename
 
 # exports
 __all__: typing.Sequence[str] = (
@@ -36,4 +36,18 @@ class Node():
         self.node_type = URI(node_type)
         self.uri = URI(uri)
 
+    def __eq__(self, other: typing.Any) -> bool:
+        return isinstance(other, Node) \
+            and other.node_type == self.node_type \
+            and other.uri == self.uri
+
+    def __hash__(self) -> int:
+        return hash((type(self), self.node_type, self.uri))
+
+    def __str__(self) -> str:
+        return f'{typename(self)}({self.node_type}, {self.uri})'
+
+    def __repr__(self) -> str:
+        return f'{typename(self)}({self.node_type}, {self.uri})'
+
 ## EOF ##