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# Copyright (c) 2001 - 2005
# Yuan Wang. All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. Redistributions in any form must be accompanied by information on
# how to obtain complete source code for the X-Diff software and any
# accompanying software that uses the X-Diff software. The source code
# must either be included in the distribution or be available for no
# more than the cost of distribution plus a nominal fee, and must be
# freely redistributable under reasonable conditions. For an executable
# file, complete source code means the source code for all modules it
# contains. It does not include source code for modules or files that
# typically accompany the major components of the operating system on
# which the executable file runs.
# THIS SOFTWARE IS PROVIDED BY YUAN WANG "AS IS" AND ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT,
# ARE DISCLAIMED. IN NO EVENT SHALL YUAN WANG BE LIABLE FOR ANY DIRECT,
# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import XTree
# <code>XLut</code> is the hash lookup table for node distance.
class XLut:
# Constructor.
def __init__(self):
self._xTable = {}
# Add a node pair and their distance to this table.
# @param eid1 element id #1
# @param eid2 element id #2
# @param dist distance
def add(self, eid1, eid2, dist):
key = eid1
key = key << 32
key += eid2
self._xTable[key] = int(dist)
# Get the distance of a node pair.
# @param eid1 element id #1
# @param eid2 element id #2
# @return distance or -1 if not found
def get(self, eid1, eid2):
key = eid1
key = key << 32
key += eid2
value = self._xTable[key]
if value == None:
return XTree.NO_CONNECTION
else:
return int(value)
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