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111 lines
3.6 KiB
Python
111 lines
3.6 KiB
Python
"""
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Created on 7 May 2013
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@author: mike
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"""
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import collections
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from volatility.framework.interfaces.configuration import CONFIG_SEPARATOR
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class HierarchicalDict(collections.Mapping):
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def __init__(self, separator = CONFIG_SEPARATOR, initial_dict = None):
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if not (isinstance(separator, str) and len(separator) == 1):
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raise TypeError("Separator must be a one character string")
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self._separator = separator
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self._data = {}
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self._subdict = {}
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if isinstance(initial_dict, dict):
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for k, v in initial_dict.items():
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self[k] = v
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@property
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def separator(self):
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return self._separator
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@property
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def data(self):
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return self._data.copy()
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def _key_head(self, key):
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"""Returns the first division of a key based on the dict separator,
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or the full key if the separator is not present
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"""
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if self.separator in key:
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return key[:key.index(self.separator)]
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else:
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return key
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def _key_tail(self, key):
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"""Returns all but the first division of a key based on the dict separator,
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or None if the separator is not in the key
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"""
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if self.separator in key:
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return key[key.index(self.separator) + 1:]
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return None
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def __iter__(self):
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"""Returns an iterator object that supports the iterator protocol"""
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return self.generator()
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def generator(self):
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"""Yields the next element in the iterator"""
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for key in self._data:
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yield key
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for subdict_key in self._subdict:
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for key in self._subdict[subdict_key]:
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yield subdict_key + self.separator + key
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def __getitem__(self, key):
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"""Gets an item, traversing down the trees to get to the final value"""
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try:
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if self.separator in key:
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subdict = self._subdict[self._key_head(key)]
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return subdict[self._key_tail(key)]
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else:
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return self._data[key]
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except KeyError:
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raise KeyError(key)
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def __setitem__(self, key, value):
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"""Sets an item or creates a subdict and sets the item within that"""
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if self.separator in key:
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subdict = self._subdict.get(self._key_head(key), HierarchicalDict(self.separator))
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subdict[self._key_tail(key)] = value
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self._subdict[self._key_head(key)] = subdict
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else:
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self._data[key] = value
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def __delitem__(self, key):
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"""Deletes an item from the hierarchical dict"""
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try:
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if self.separator in key:
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subdict = self._subdict[self._key_head(key)]
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del subdict[self._key_tail(key)]
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if not subdict:
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del self._subdict[self._key_head(key)]
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except KeyError:
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raise KeyError(key)
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def __contains__(self, key):
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"""Determines whether the key is present in the hierarchy"""
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if self.separator in key:
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try:
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subdict = self._subdict[self._key_head(key)]
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return self._key_tail(key) in subdict
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except KeyError:
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return False
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else:
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return key in self._data
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def __len__(self):
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"""Returns the length of all items"""
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return len(self._data) + sum([len(subdict) for subdict in self._subdict])
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def branch(self, key):
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"""Returns the HierarchicalDict housed under the key"""
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if self.separator in key:
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return self._subdict[self._key_head(key)].branch(self._key_tail(key))
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else:
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return self._subdict[key]
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