169 lines
5.1 KiB
Python
169 lines
5.1 KiB
Python
from threading import RLock
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try:
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from UserDict import DictMixin
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except ImportError:
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from collections import Mapping as DictMixin
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# With lazy loading, we might end up with multiple threads triggering
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# it at the same time. We need a lock.
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_fill_lock = RLock()
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class LazyDict(DictMixin):
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"""Dictionary populated on first use."""
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data = None
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def __getitem__(self, key):
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if self.data is None:
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_fill_lock.acquire()
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try:
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if self.data is None:
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self._fill()
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finally:
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_fill_lock.release()
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return self.data[key.upper()]
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def __contains__(self, key):
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if self.data is None:
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_fill_lock.acquire()
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try:
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if self.data is None:
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self._fill()
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finally:
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_fill_lock.release()
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return key in self.data
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def __iter__(self):
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if self.data is None:
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_fill_lock.acquire()
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try:
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if self.data is None:
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self._fill()
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finally:
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_fill_lock.release()
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return iter(self.data)
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def __len__(self):
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if self.data is None:
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_fill_lock.acquire()
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try:
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if self.data is None:
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self._fill()
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finally:
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_fill_lock.release()
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return len(self.data)
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def keys(self):
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if self.data is None:
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_fill_lock.acquire()
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try:
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if self.data is None:
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self._fill()
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finally:
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_fill_lock.release()
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return self.data.keys()
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class LazyList(list):
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"""List populated on first use."""
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_props = [
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'__str__', '__repr__', '__unicode__',
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'__hash__', '__sizeof__', '__cmp__',
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'__lt__', '__le__', '__eq__', '__ne__', '__gt__', '__ge__',
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'append', 'count', 'index', 'extend', 'insert', 'pop', 'remove',
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'reverse', 'sort', '__add__', '__radd__', '__iadd__', '__mul__',
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'__rmul__', '__imul__', '__contains__', '__len__', '__nonzero__',
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'__getitem__', '__setitem__', '__delitem__', '__iter__',
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'__reversed__', '__getslice__', '__setslice__', '__delslice__']
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def __new__(cls, fill_iter=None):
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if fill_iter is None:
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return list()
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# We need a new class as we will be dynamically messing with its
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# methods.
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class LazyList(list):
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pass
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fill_iter = [fill_iter]
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def lazy(name):
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def _lazy(self, *args, **kw):
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_fill_lock.acquire()
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try:
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if len(fill_iter) > 0:
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list.extend(self, fill_iter.pop())
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for method_name in cls._props:
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delattr(LazyList, method_name)
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finally:
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_fill_lock.release()
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return getattr(list, name)(self, *args, **kw)
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return _lazy
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for name in cls._props:
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setattr(LazyList, name, lazy(name))
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new_list = LazyList()
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return new_list
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# Not all versions of Python declare the same magic methods.
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# Filter out properties that don't exist in this version of Python
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# from the list.
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LazyList._props = [prop for prop in LazyList._props if hasattr(list, prop)]
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class LazySet(set):
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"""Set populated on first use."""
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_props = (
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'__str__', '__repr__', '__unicode__',
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'__hash__', '__sizeof__', '__cmp__',
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'__lt__', '__le__', '__eq__', '__ne__', '__gt__', '__ge__',
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'__contains__', '__len__', '__nonzero__',
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'__getitem__', '__setitem__', '__delitem__', '__iter__',
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'__sub__', '__and__', '__xor__', '__or__',
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'__rsub__', '__rand__', '__rxor__', '__ror__',
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'__isub__', '__iand__', '__ixor__', '__ior__',
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'add', 'clear', 'copy', 'difference', 'difference_update',
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'discard', 'intersection', 'intersection_update', 'isdisjoint',
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'issubset', 'issuperset', 'pop', 'remove',
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'symmetric_difference', 'symmetric_difference_update',
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'union', 'update')
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def __new__(cls, fill_iter=None):
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if fill_iter is None:
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return set()
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class LazySet(set):
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pass
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fill_iter = [fill_iter]
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def lazy(name):
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def _lazy(self, *args, **kw):
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_fill_lock.acquire()
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try:
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if len(fill_iter) > 0:
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for i in fill_iter.pop():
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set.add(self, i)
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for method_name in cls._props:
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delattr(LazySet, method_name)
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finally:
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_fill_lock.release()
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return getattr(set, name)(self, *args, **kw)
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return _lazy
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for name in cls._props:
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setattr(LazySet, name, lazy(name))
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new_set = LazySet()
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return new_set
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# Not all versions of Python declare the same magic methods.
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# Filter out properties that don't exist in this version of Python
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# from the list.
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LazySet._props = [prop for prop in LazySet._props if hasattr(set, prop)]
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