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"""
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
"""
from __future__ import absolute_import
import kafka.streams.errors as Errors
class QuickUnion(object):
def __init__(self):
self.ids = {}
def add(self, foo):
self.ids[foo] = foo
def exists(self, foo):
return foo in self.ids
def root(self, foo):
"""
@throws NoSuchElementException if the parent of this node is null
"""
current = foo
parent = self.ids.get(current)
if not parent:
raise Errors.NoSuchElementError("id: " + str(foo))
while parent != current:
# do the path compression
grandparent = self.ids.get(parent)
self.ids[current] = grandparent
current = parent
parent = grandparent
return current
def unite(self, foo, foobars):
for bar in foobars:
self.unite_pair(foo, bar)
def unite_pair(self, foo, bar):
root1 = self.root(foo)
root2 = self.root(bar)
if root1 != root2:
self.ids[root1] = root2
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