package org.apache.lucene.queries.function;
/*
* 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.
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import java.io.IOException;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.queries.function.valuesource.IntFieldSource;
import org.apache.lucene.search.FieldDoc;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
/** Test that functionquery's getSortField() actually works */
public class TestFunctionQuerySort extends LuceneTestCase {
public void testSearchAfterWhenSortingByFunctionValues() throws IOException {
Directory dir = newDirectory();
IndexWriterConfig iwc = newIndexWriterConfig(TEST_VERSION_CURRENT, null);
iwc.setMergePolicy(newLogMergePolicy()); // depends on docid order
RandomIndexWriter writer = new RandomIndexWriter(random(), dir, iwc);
Document doc = new Document();
Field field = new StringField("value", "", Field.Store.YES);
doc.add(field);
// Save docs unsorted (decreasing value n, n-1, ...)
final int NUM_VALS = 5;
for (int val = NUM_VALS; val > 0; val--) {
field.setStringValue(Integer.toString(val));
writer.addDocument(doc);
}
// Open index
IndexReader reader = writer.getReader();
writer.close();
IndexSearcher searcher = newSearcher(reader);
// Get ValueSource from FieldCache
IntFieldSource src = new IntFieldSource("value");
// ...and make it a sort criterion
SortField sf = src.getSortField(false).rewrite(searcher);
Sort orderBy = new Sort(sf);
// Get hits sorted by our FunctionValues (ascending values)
Query q = new MatchAllDocsQuery();
TopDocs hits = searcher.search(q, Integer.MAX_VALUE, orderBy);
assertEquals(NUM_VALS, hits.scoreDocs.length);
// Verify that sorting works in general
int i = 0;
for (ScoreDoc hit : hits.scoreDocs) {
int valueFromDoc = Integer.parseInt(reader.document(hit.doc).get("value"));
assertEquals(++i, valueFromDoc);
}
// Now get hits after hit #2 using IS.searchAfter()
int afterIdx = 1;
FieldDoc afterHit = (FieldDoc) hits.scoreDocs[afterIdx];
hits = searcher.searchAfter(afterHit, q, Integer.MAX_VALUE, orderBy);
// Expected # of hits: NUM_VALS - 2
assertEquals(NUM_VALS - (afterIdx + 1), hits.scoreDocs.length);
// Verify that hits are actually "after"
int afterValue = ((Double) afterHit.fields[0]).intValue();
for (ScoreDoc hit : hits.scoreDocs) {
int val = Integer.parseInt(reader.document(hit.doc).get("value"));
assertTrue(afterValue <= val);
assertFalse(hit.doc == afterHit.doc);
}
reader.close();
dir.close();
}
}