| /* |
| * 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. |
| */ |
| package org.apache.lucene.search.spell; |
| |
| import org.apache.lucene.util.LuceneTestCase; |
| |
| public class TestNGramDistance extends LuceneTestCase { |
| |
| |
| |
| public void testGetDistance1() { |
| StringDistance nsd = new NGramDistance(1); |
| float d = nsd.getDistance("al", "al"); |
| assertEquals(d,1.0f,0.001); |
| d = nsd.getDistance("a", "a"); |
| assertEquals(d,1.0f,0.001); |
| d = nsd.getDistance("b", "a"); |
| assertEquals(d,0.0f,0.001); |
| d = nsd.getDistance("martha", "marhta"); |
| assertEquals(d,0.6666,0.001); |
| d = nsd.getDistance("jones", "johnson"); |
| assertEquals(d,0.4285,0.001); |
| d = nsd.getDistance("natural", "contrary"); |
| assertEquals(d,0.25,0.001); |
| d = nsd.getDistance("abcvwxyz", "cabvwxyz"); |
| assertEquals(d,0.75,0.001); |
| d = nsd.getDistance("dwayne", "duane"); |
| assertEquals(d,0.666,0.001); |
| d = nsd.getDistance("dixon", "dicksonx"); |
| assertEquals(d,0.5,0.001); |
| d = nsd.getDistance("six", "ten"); |
| assertEquals(d,0,0.001); |
| float d1 = nsd.getDistance("zac ephron", "zac efron"); |
| float d2 = nsd.getDistance("zac ephron", "kai ephron"); |
| assertEquals(d1,d2,0.001); |
| d1 = nsd.getDistance("brittney spears", "britney spears"); |
| d2 = nsd.getDistance("brittney spears", "brittney startzman"); |
| assertTrue(d1 > d2); |
| d1 = nsd.getDistance("12345678", "12890678"); |
| d2 = nsd.getDistance("12345678", "72385698"); |
| assertEquals(d1,d2,001); |
| } |
| |
| public void testGetDistance2() { |
| StringDistance sd = new NGramDistance(2); |
| float d = sd.getDistance("al", "al"); |
| assertEquals(d,1.0f,0.001); |
| d = sd.getDistance("a", "a"); |
| assertEquals(d,1.0f,0.001); |
| d = sd.getDistance("b", "a"); |
| assertEquals(d,0.0f,0.001); |
| d = sd.getDistance("a", "aa"); |
| assertEquals(d,0.5f,0.001); |
| d = sd.getDistance("martha", "marhta"); |
| assertEquals(d,0.6666,0.001); |
| d = sd.getDistance("jones", "johnson"); |
| assertEquals(d,0.4285,0.001); |
| d = sd.getDistance("natural", "contrary"); |
| assertEquals(d,0.25,0.001); |
| d = sd.getDistance("abcvwxyz", "cabvwxyz"); |
| assertEquals(d,0.625,0.001); |
| d = sd.getDistance("dwayne", "duane"); |
| assertEquals(d,0.5833,0.001); |
| d = sd.getDistance("dixon", "dicksonx"); |
| assertEquals(d,0.5,0.001); |
| d = sd.getDistance("six", "ten"); |
| assertEquals(d,0,0.001); |
| float d1 = sd.getDistance("zac ephron", "zac efron"); |
| float d2 = sd.getDistance("zac ephron", "kai ephron"); |
| assertTrue(d1 > d2); |
| d1 = sd.getDistance("brittney spears", "britney spears"); |
| d2 = sd.getDistance("brittney spears", "brittney startzman"); |
| assertTrue(d1 > d2); |
| d1 = sd.getDistance("0012345678", "0012890678"); |
| d2 = sd.getDistance("0012345678", "0072385698"); |
| assertEquals(d1,d2,0.001); |
| } |
| |
| public void testGetDistance3() { |
| StringDistance sd = new NGramDistance(3); |
| float d = sd.getDistance("al", "al"); |
| assertEquals(d,1.0f,0.001); |
| d = sd.getDistance("a", "a"); |
| assertEquals(d,1.0f,0.001); |
| d = sd.getDistance("b", "a"); |
| assertEquals(d,0.0f,0.001); |
| d = sd.getDistance("martha", "marhta"); |
| assertEquals(d,0.7222,0.001); |
| d = sd.getDistance("jones", "johnson"); |
| assertEquals(d,0.4762,0.001); |
| d = sd.getDistance("natural", "contrary"); |
| assertEquals(d,0.2083,0.001); |
| d = sd.getDistance("abcvwxyz", "cabvwxyz"); |
| assertEquals(d,0.5625,0.001); |
| d = sd.getDistance("dwayne", "duane"); |
| assertEquals(d,0.5277,0.001); |
| d = sd.getDistance("dixon", "dicksonx"); |
| assertEquals(d,0.4583,0.001); |
| d = sd.getDistance("six", "ten"); |
| assertEquals(d,0,0.001); |
| float d1 = sd.getDistance("zac ephron", "zac efron"); |
| float d2 = sd.getDistance("zac ephron", "kai ephron"); |
| assertTrue(d1 > d2); |
| d1 = sd.getDistance("brittney spears", "britney spears"); |
| d2 = sd.getDistance("brittney spears", "brittney startzman"); |
| assertTrue(d1 > d2); |
| d1 = sd.getDistance("0012345678", "0012890678"); |
| d2 = sd.getDistance("0012345678", "0072385698"); |
| assertTrue(d1 < d2); |
| } |
| |
| public void testEmpty() throws Exception { |
| StringDistance nsd = new NGramDistance(1); |
| float d = nsd.getDistance("", "al"); |
| assertEquals(d,0.0f,0.001); |
| } |
| } |