public code v1

plugins/Jython/Lib/_weakrefset.py

@@ -0,0 +1,21 @@
+# Access WeakSet through the weakref module.
+# This code is separated-out because it is needed
+# by abc.py to load everything else at startup.
+
+from java.util import WeakHashMap
+from java.util.Collections import newSetFromMap, synchronizedMap
+from jythonlib import set_builder, MapMaker
+
+__all__ = ['WeakSet']
+
+
+class WeakSet(set):
+
+    def __new__(cls, data=None):
+        def _build():
+            # Although not specified in the docs, WeakSet supports equality on
+            # keys, as seen in test_weakset and its use of testing class
+            # SomeClass. Therefore we cannot use MapMaker in this case.
+            return newSetFromMap(synchronizedMap(WeakHashMap()))
+
+        return set_builder(_build, cls)(data)