| /* |
| * 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.analysis.shingle; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import org.apache.lucene.analysis.BaseTokenStreamTestCase; |
| import org.apache.lucene.analysis.CannedTokenStream; |
| import org.apache.lucene.analysis.Token; |
| import org.apache.lucene.analysis.TokenStream; |
| import org.apache.lucene.util.graph.GraphTokenStreamFiniteStrings; |
| |
| public class FixedShingleFilterTest extends BaseTokenStreamTestCase { |
| |
| public void testBiGramFilter() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("please", 0, 6), |
| new Token("divide", 7, 13), |
| new Token("this", 14, 18), |
| new Token("sentence", 19, 27), |
| new Token("into", 28, 32), |
| new Token("shingles", 33, 41) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 2), |
| new String[]{"please divide", "divide this", "this sentence", "sentence into", "into shingles"}, |
| new int[]{0, 7, 14, 19, 28,}, |
| new int[]{13, 18, 27, 32, 41,}, |
| new String[]{"shingle", "shingle", "shingle", "shingle", "shingle",}, |
| new int[]{1, 1, 1, 1, 1,}, |
| new int[]{1, 1, 1, 1, 1}); |
| |
| } |
| |
| public void testBiGramFilterWithAltSeparator() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("please", 0, 6), |
| new Token("divide", 7, 13), |
| new Token("this", 14, 18), |
| new Token("sentence", 19, 27), |
| new Token("into", 28, 32), |
| new Token("shingles", 33, 41) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 2, "<SEP>", "_"), |
| new String[]{"please<SEP>divide", "divide<SEP>this", "this<SEP>sentence", "sentence<SEP>into", "into<SEP>shingles"}, |
| new int[]{0, 7, 14, 19, 28}, |
| new int[]{13, 18, 27, 32, 41}, |
| new String[]{"shingle", "shingle", "shingle", "shingle", "shingle"}, |
| new int[]{1, 1, 1, 1, 1}); |
| |
| } |
| |
| public void testTriGramFilter() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("please", 0, 6), |
| new Token("divide", 7, 13), |
| new Token("this", 14, 18), |
| new Token("sentence", 19, 27), |
| new Token("into", 28, 32), |
| new Token("shingles", 33, 41) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 3), |
| new String[]{"please divide this", "divide this sentence", "this sentence into", "sentence into shingles"}); |
| } |
| |
| public void testShingleSizeGreaterThanTokenstreamLength() throws IOException { |
| |
| TokenStream ts = new FixedShingleFilter(new CannedTokenStream( |
| new Token("please", 0, 6), |
| new Token("divide", 7, 13) |
| ), 3); |
| |
| ts.reset(); |
| assertFalse(ts.incrementToken()); |
| |
| } |
| |
| public void testWithStopwords() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("please", 0, 6), |
| new Token("divide", 7, 13), |
| new Token("sentence", 2, 19, 27), |
| new Token("shingles", 2, 33, 41) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 3), |
| new String[]{"please divide _", "divide _ sentence", "sentence _ shingles"}, |
| new int[]{0, 7, 19,}, |
| new int[]{13, 27, 41,}, |
| new String[]{"shingle", "shingle", "shingle",}, |
| new int[]{1, 1, 2,}); |
| |
| } |
| |
| public void testConsecutiveStopwords() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("b", 2, 2, 3), |
| new Token("c", 4, 5), |
| new Token("d", 6, 7), |
| new Token("b", 3, 12, 13), |
| new Token("c", 14, 15) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 4), |
| new String[]{"b c d _", "c d _ _", "d _ _ b"}, |
| new int[]{2, 4, 6,}, |
| new int[]{7, 7, 13,}, |
| new int[]{2, 1, 1,}); |
| } |
| |
| public void testTrailingStopwords() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream(1, 7, |
| new Token("b", 0, 1), |
| new Token("c", 2, 3), |
| new Token("d", 4, 5) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 3), |
| new String[] { "b c d", "c d _" }, |
| new int[] { 0, 2, }, |
| new int[] { 5, 5, }, |
| new int[] { 1, 1, }); |
| |
| |
| } |
| |
| public void testMultipleTrailingStopwords() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream(2, 9, |
| new Token("b", 0, 1), |
| new Token("c", 2, 3), |
| new Token("d", 4, 5) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 3), |
| new String[] { "b c d", "c d _", "d _ _" }, |
| new int[] { 0, 2, 4 }, |
| new int[] { 5, 5, 5 }, |
| new int[] { 1, 1, 1 }); |
| } |
| |
| public void testIncomingGraphs() throws IOException { |
| |
| // b/a c b/a d |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("b", 0, 1), |
| new Token("a", 0, 0, 1), |
| new Token("c", 2, 3), |
| new Token("b", 4, 5), |
| new Token("a", 0, 4, 5), |
| new Token("d", 6, 7) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 2), |
| new String[] { "b c", "a c", "c b", "c a", "b d", "a d" }, |
| new int[] { 0, 0, 2, 2, 4, 4 }, |
| new int[] { 3, 3, 5, 5, 7, 7 }, |
| new int[] { 1, 0, 1, 0, 1, 0 }); |
| } |
| |
| public void testShinglesSpanningGraphs() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("b", 0, 1), |
| new Token("a", 0, 0, 1), |
| new Token("c", 2, 3), |
| new Token("b", 4, 5), |
| new Token("a", 0, 4, 5), |
| new Token("d", 6, 7) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 3), |
| new String[] { "b c b", "b c a", "a c b", "a c a", "c b d", "c a d" }, |
| new int[] { 0, 0, 0, 0, 2, 2, }, |
| new int[] { 5, 5, 5, 5, 7, 7, }, |
| new int[] { 1, 0, 0, 0, 1, 0, }); |
| } |
| |
| public void testTrailingGraphsOfDifferingLengths() throws IOException { |
| |
| // a b:3/c d e f |
| TokenStream ts = new CannedTokenStream( |
| new Token("a", 0, 1), |
| new Token("b", 1, 2, 3, 3), |
| new Token("c", 0, 2, 3), |
| new Token("d", 2, 3), |
| new Token("e", 2, 3), |
| new Token("f", 4, 5) |
| ); |
| |
| assertTokenStreamContents(new FixedShingleFilter(ts, 3), |
| new String[]{ "a b f", "a c d", "c d e", "d e f"}); |
| |
| } |
| |
| public void testParameterLimits() { |
| IllegalArgumentException e = expectThrows(IllegalArgumentException.class, () -> { |
| new FixedShingleFilter(new CannedTokenStream(), 1); |
| }); |
| assertEquals("Shingle size must be between 2 and 4, got 1", e.getMessage()); |
| IllegalArgumentException e2 = expectThrows(IllegalArgumentException.class, () -> { |
| new FixedShingleFilter(new CannedTokenStream(), 5); |
| }); |
| assertEquals("Shingle size must be between 2 and 4, got 5", e2.getMessage()); |
| } |
| |
| public void testWithGraphInput() throws IOException { |
| |
| TokenStream ts = new CannedTokenStream( |
| new Token("fuz", 0, 3), |
| new Token("foo", 1, 4, 6, 2), |
| new Token("bar", 0, 4, 6), |
| new Token("baz", 1, 4, 6) |
| ); |
| GraphTokenStreamFiniteStrings graph = new GraphTokenStreamFiniteStrings(ts); |
| Iterator<TokenStream> it = graph.getFiniteStrings(); |
| assertTokenStreamContents(new FixedShingleFilter(it.next(), 2), new String[]{ "fuz foo"}); |
| assertTokenStreamContents(new FixedShingleFilter(it.next(), 2), new String[]{ "fuz bar", "bar baz"}); |
| |
| } |
| |
| } |