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6d3fed8f52
And in the rest of the locations we must then check if it's None and handle that gracefully. Here we assume that the getContainer message shows a message to the user if necessary. For now we'll just log it. Contributes to issue CURA-5045.
52 lines
2.0 KiB
Python
52 lines
2.0 KiB
Python
# Copyright (c) 2018 Ultimaker B.V.
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# Cura is released under the terms of the LGPLv3 or higher.
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from typing import Optional
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from collections import OrderedDict
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from UM.Logger import Logger
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from UM.Settings.InstanceContainer import InstanceContainer
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##
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# A metadata / container combination. Use getContainer() to get the container corresponding to the metadata.
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#
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# ContainerNode is a multi-purpose class. It has two main purposes:
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# 1. It encapsulates an InstanceContainer. It contains that InstanceContainer's
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# - metadata (Always)
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# - container (lazy-loaded when needed)
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# 2. It also serves as a node in a hierarchical InstanceContainer lookup table/tree.
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# This is used in Variant, Material, and Quality Managers.
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#
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class ContainerNode:
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__slots__ = ("metadata", "container", "children_map")
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def __init__(self, metadata: Optional[dict] = None):
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self.metadata = metadata
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self.container = None
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self.children_map = OrderedDict()
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def getChildNode(self, child_key: str) -> Optional["ContainerNode"]:
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return self.children_map.get(child_key)
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def getContainer(self) -> Optional["InstanceContainer"]:
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if self.metadata is None:
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Logger.log("e", "Cannot get container for a ContainerNode without metadata.")
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return None
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if self.container is None:
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container_id = self.metadata["id"]
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Logger.log("i", "Lazy-loading container [%s]", container_id)
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from UM.Settings.ContainerRegistry import ContainerRegistry
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container_list = ContainerRegistry.getInstance().findInstanceContainers(id = container_id)
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if not container_list:
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Logger.log("e", "Failed to lazy-load container [{container_id}]. Cannot find it.".format(container_id = container_id))
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return None
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self.container = container_list[0]
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return self.container
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def __str__(self) -> str:
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return "%s[%s]" % (self.__class__.__name__, self.metadata.get("id"))
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