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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.querytransform.test;
import com.yahoo.component.chain.Chain;
import com.yahoo.language.Language;
import com.yahoo.language.Linguistics;
import com.yahoo.prelude.IndexFacts;
import com.yahoo.prelude.IndexFactsFactory;
import com.yahoo.prelude.query.Item;
import com.yahoo.prelude.query.NullItem;
import com.yahoo.prelude.query.parser.TestLinguistics;
import com.yahoo.prelude.querytransform.CJKSearcher;
import com.yahoo.search.Query;
import com.yahoo.search.Searcher;
import com.yahoo.search.query.parser.Parsable;
import com.yahoo.search.query.parser.Parser;
import com.yahoo.search.query.parser.ParserEnvironment;
import com.yahoo.search.query.parser.ParserFactory;
import com.yahoo.search.searchchain.Execution;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
/**
* @author Steinar Knutsen
*/
public class CJKSearcherTestCase {
private final IndexFacts indexFacts = IndexFactsFactory.newInstance("file:src/test/java/com/yahoo/prelude/" +
"querytransform/test/cjk-index-info.cfg", null);
@Test
void testTermWeight() {
assertTransformed("efg!10", "SAND e!10 fg!10",
Query.Type.ALL, Language.CHINESE_SIMPLIFIED, Language.CHINESE_TRADITIONAL, TestLinguistics.INSTANCE);
}
/**
* Overlapping tokens splits some sequences of "bcd" into "bc" "cd" instead of e.g. "b",
* "cd". This improves recall in some cases. Vespa
* must combine overlapping tokens as PHRASE, not AND to avoid a too high recall because of the token overlap.
*/
@Test
void testCjkQueryWithOverlappingTokens() {
// The test language segmenter will segment "bcd" into the overlapping tokens "bc" "cd"
assertTransformed("bcd", "SAND bc cd", Query.Type.ALL, Language.CHINESE_SIMPLIFIED, Language.CHINESE_TRADITIONAL,
TestLinguistics.INSTANCE);
// While "efg" will be segmented into one of the standard options, "e" "fg"
assertTransformed("efg", "SAND e fg", Query.Type.ALL, Language.CHINESE_SIMPLIFIED, Language.CHINESE_TRADITIONAL,
TestLinguistics.INSTANCE);
}
private void assertTransformed(String queryString, String expected, Query.Type mode, Language actualLanguage,
Language queryLanguage, Linguistics linguistics) {
Parser parser = ParserFactory.newInstance(mode, new ParserEnvironment()
.setIndexFacts(indexFacts)
.setLinguistics(linguistics));
Item root = parser.parse(new Parsable().setQuery(queryString).setLanguage(actualLanguage)).getRoot();
assertFalse(root instanceof NullItem);
Query query = new Query("?language=" + queryLanguage.languageCode());
query.getModel().getQueryTree().setRoot(root);
new Execution(new Chain<Searcher>(new CJKSearcher()),
Execution.Context.createContextStub(indexFacts, linguistics)).search(query);
assertEquals(expected, query.getModel().getQueryTree().getRoot().toString());
}
}
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