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"""
Item extracters for the HMC Layers.
"""

from typing import Any, Dict, List

[docs]
class CachedExtracter:
"""
Caches the already requested item from the collection.
This way items requested repeatedly from the collection
can be called fetched once from the it and reused.
"""

def init(self, collection: List[Any]):
"""
Initializes the CachedExtracter.

:param collection: List of given items.
"""

self.collection = collection
self.cache: Dict[int, Any] =

[docs]
def get(self, index: int):
"""
Gets the item from the cache. If it is absent in the cache,
item from the collection is fetched and cached.

:param index: index against which item needs to be fetched and/or cached.
:return: the item against the index.
"""

if index not in self.cache:
self.cache[index] = self.collection[index]
return self.cache[index]