/*
* 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.spans;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.PostingsEnum;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.junit.Test;
public class TestSpanCollection extends LuceneTestCase {
protected IndexSearcher searcher;
protected Directory directory;
protected IndexReader reader;
public static final String FIELD = "field";
public static FieldType OFFSETS = new FieldType(TextField.TYPE_STORED);
static {
OFFSETS.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS);
}
@Override
public void tearDown() throws Exception {
reader.close();
directory.close();
super.tearDown();
}
@Override
public void setUp() throws Exception {
super.setUp();
directory = newDirectory();
RandomIndexWriter writer = new RandomIndexWriter(random(), directory,
newIndexWriterConfig(new MockAnalyzer(random())).setMergePolicy(newLogMergePolicy()));
for (int i = 0; i < docFields.length; i++) {
Document doc = new Document();
doc.add(newField(FIELD, docFields[i], OFFSETS));
writer.addDocument(doc);
}
writer.forceMerge(1);
reader = writer.getReader();
writer.close();
searcher = newSearcher(getOnlyLeafReader(reader));
}
private static class TermCollector implements SpanCollector {
final Set<Term> terms = new HashSet<>();
@Override
public void collectLeaf(PostingsEnum postings, int position, Term term) throws IOException {
terms.add(term);
}
@Override
public void reset() {
terms.clear();
}
}
protected String[] docFields = {
"w1 w2 w3 w4 w5",
"w1 w3 w2 w3 zz",
"w1 xx w2 yy w4",
"w1 w2 w1 w4 w2 w3"
};
private void checkCollectedTerms(Spans spans, TermCollector collector, Term... expectedTerms) throws IOException {
collector.reset();
spans.collect(collector);
for (Term t : expectedTerms) {
assertTrue("Missing term " + t, collector.terms.contains(t));
}
assertEquals("Unexpected terms found", expectedTerms.length, collector.terms.size());
}
@Test
public void testNestedNearQuery() throws IOException {
// near(w1, near(w2, or(w3, w4)))
SpanTermQuery q1 = new SpanTermQuery(new Term(FIELD, "w1"));
SpanTermQuery q2 = new SpanTermQuery(new Term(FIELD, "w2"));
SpanTermQuery q3 = new SpanTermQuery(new Term(FIELD, "w3"));
SpanTermQuery q4 = new SpanTermQuery(new Term(FIELD, "w4"));
SpanOrQuery q5 = new SpanOrQuery(q4, q3);
SpanNearQuery q6 = new SpanNearQuery(new SpanQuery[]{q2, q5}, 1, true);
SpanNearQuery q7 = new SpanNearQuery(new SpanQuery[]{q1, q6}, 1, true);
TermCollector collector = new TermCollector();
Spans spans = q7.createWeight(searcher, false, 1f).getSpans(searcher.getIndexReader().leaves().get(0), SpanWeight.Postings.POSITIONS);
assertEquals(0, spans.advance(0));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w1"), new Term(FIELD, "w2"), new Term(FIELD, "w3"));
assertEquals(3, spans.advance(3));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w1"), new Term(FIELD, "w2"), new Term(FIELD, "w4"));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w1"), new Term(FIELD, "w2"), new Term(FIELD, "w3"));
}
@Test
public void testOrQuery() throws IOException {
SpanTermQuery q2 = new SpanTermQuery(new Term(FIELD, "w2"));
SpanTermQuery q3 = new SpanTermQuery(new Term(FIELD, "w3"));
SpanOrQuery orQuery = new SpanOrQuery(q2, q3);
TermCollector collector = new TermCollector();
Spans spans = orQuery.createWeight(searcher, false, 1f).getSpans(searcher.getIndexReader().leaves().get(0), SpanWeight.Postings.POSITIONS);
assertEquals(1, spans.advance(1));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w3"));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w2"));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w3"));
assertEquals(3, spans.advance(3));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w2"));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w2"));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w3"));
}
@Test
public void testSpanNotQuery() throws IOException {
SpanTermQuery q1 = new SpanTermQuery(new Term(FIELD, "w1"));
SpanTermQuery q2 = new SpanTermQuery(new Term(FIELD, "w2"));
SpanTermQuery q3 = new SpanTermQuery(new Term(FIELD, "w3"));
SpanNearQuery nq = new SpanNearQuery(new SpanQuery[]{q1, q2}, 2, true);
SpanNotQuery notq = new SpanNotQuery(nq, q3);
TermCollector collector = new TermCollector();
Spans spans = notq.createWeight(searcher, false, 1f).getSpans(searcher.getIndexReader().leaves().get(0), SpanWeight.Postings.POSITIONS);
assertEquals(2, spans.advance(2));
spans.nextStartPosition();
checkCollectedTerms(spans, collector, new Term(FIELD, "w1"), new Term(FIELD, "w2"));
}
}