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treeSerialization.py
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treeSerialization.py
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from commons.commons import insert, Node, print_tree
class BinaryTreeSerialization(object):
def __init__(self, delimiter=None):
self.delimiter = delimiter
self.index = 0
def __preorder__(self, root, serialized_tree=[]):
if root is None:
serialized_tree.append(self.delimiter)
return None
serialized_tree.append(root.key)
self.__preorder__(root.left, serialized_tree)
self.__preorder__(root.right, serialized_tree)
def serialize(self, root):
serialized_tree = []
self.__preorder__(root, serialized_tree)
return serialized_tree
def deserialize(self, serialized_tree):
self.index = 0
root = self.__deserialize__(serialized_tree)
return root
def __deserialize__(self, serialized_tree):
if self.index >= len(serialized_tree) or serialized_tree[self.index] == self.delimiter:
self.index += 1
return None
root = Node(serialized_tree[self.index])
self.index += 1
root.left = self.__deserialize__(serialized_tree)
root.right = self.__deserialize__(serialized_tree)
return root
if __name__ == '__main__':
root = Node(7,
left=Node(2,
left=Node(1)
),
right=Node(5,
left=Node(3),
right=Node(8)
)
)
print "\nInput Tree - \n"
print_tree(root)
print "\n************* SERIALIZATION *************\n"
obj = BinaryTreeSerialization()
serialized_tree = obj.serialize(root)
print "Serialized Tree (Preorder) -", serialized_tree
print "\n************* DE-SERIALIZATION *************\n"
deserialized_tree_root = obj.deserialize(serialized_tree)
print "\nOutput Tree - \n"
print_tree(deserialized_tree_root)