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61 lines
2.3 KiB
Python
61 lines
2.3 KiB
Python
'''
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Created on 1 Mar 2013
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@author: mike
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'''
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from volatility.framework import interfaces, validity
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class ObjectTemplate(interfaces.objects.Template, validity.ValidityRoutines):
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"""Factory class that produces objects that adhere to the Object interface on demand
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This is effectively a method of currying, but adds more structure to avoid abuse.
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It also allows inspection of information that should already be known:
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* Structure size
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* Members, etc
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etc.
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"""
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def __init__(self, object_class = None, symbol_name = None, **kwargs):
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super(ObjectTemplate, self).__init__(symbol_name = symbol_name, **kwargs)
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self.object_class = self.class_check(object_class, interfaces.objects.ObjectInterface)
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@property
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def size(self):
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"""Returns the size of the template"""
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return self.object_class.template_size(self._kwargs)
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@property
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def children(self):
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"""A function that returns a list of child templates of a template
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This is used to traverse the template tree
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"""
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return self.object_class.template_children(self._kwargs)
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def replace_child(self, old_child, new_child):
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"""A function for replacing one child with another
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We pass in the kwargs directly so they can be changed
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"""
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self.object_class.template_replace_child(old_child, new_child, self._kwargs)
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def __call__(self, context, layer_name, offset, parent = None):
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"""Constructs the object
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Returns: an object adhereing to the Object interface
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"""
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# We always use the template size (as calculated by the object class)
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# over the one passed in by an argument
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self._kwargs['size'] = self.size
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self._kwargs['symbol_name'] = self.symbol_name
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return self.object_class(context = context, layer_name = layer_name, offset = offset, parent = parent, **self._kwargs)
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class ReferenceTemplate(interfaces.objects.Template):
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"""Factory class that produces objects based on a delayed reference type
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It should not return any attributes
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"""
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def __call__(self, context, *args, **kwargs):
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template = context.symbol_space.resolve(self._symbol_name)
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return template(context = context, *args, **kwargs)
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