Lucene example source code file (TermAllGroupsCollectorTest.java)

This example Lucene source code file (TermAllGroupsCollectorTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Lucene tags/keywords

directory, document, document, exception, field, field, randomindexwriter, string, term, termallgroupscollector, termallgroupscollector, termallgroupscollectortest, termquery, termquery

The Lucene TermAllGroupsCollectorTest.java source code

package org.apache.lucene.search.grouping;

/*
 * 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.
 */

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class TermAllGroupsCollectorTest extends LuceneTestCase {

  public void testTotalGroupCount() throws Exception {

    final String groupField = "author";

    Directory dir = newDirectory();
    RandomIndexWriter w = new RandomIndexWriter(
                               random,
                               dir,
                               newIndexWriterConfig(TEST_VERSION_CURRENT,
                                                    new MockAnalyzer(random)).setMergePolicy(newLogMergePolicy()));
    // 0
    Document doc = new Document();
    doc.add(new Field(groupField, "author1", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("content", "random text", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("id", "1", Field.Store.YES, Field.Index.NO));
    w.addDocument(doc);

    // 1
    doc = new Document();
    doc.add(new Field(groupField, "author1", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("content", "some more random text blob", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("id", "2", Field.Store.YES, Field.Index.NO));
    w.addDocument(doc);

    // 2
    doc = new Document();
    doc.add(new Field(groupField, "author1", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("content", "some more random textual data", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("id", "3", Field.Store.YES, Field.Index.NO));
    w.addDocument(doc);
    w.commit(); // To ensure a second segment

    // 3
    doc = new Document();
    doc.add(new Field(groupField, "author2", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("content", "some random text", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("id", "4", Field.Store.YES, Field.Index.NO));
    w.addDocument(doc);

    // 4
    doc = new Document();
    doc.add(new Field(groupField, "author3", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("content", "some more random text", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("id", "5", Field.Store.YES, Field.Index.NO));
    w.addDocument(doc);

    // 5
    doc = new Document();
    doc.add(new Field(groupField, "author3", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("content", "random blob", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("id", "6", Field.Store.YES, Field.Index.NO));
    w.addDocument(doc);

    // 6 -- no author field
    doc = new Document();
    doc.add(new Field("content", "random word stuck in alot of other text", Field.Store.YES, Field.Index.ANALYZED));
    doc.add(new Field("id", "6", Field.Store.YES, Field.Index.NO));
    w.addDocument(doc);

    IndexSearcher indexSearcher = new IndexSearcher(w.getReader());
    w.close();

    TermAllGroupsCollector c1 = new TermAllGroupsCollector(groupField);
    indexSearcher.search(new TermQuery(new Term("content", "random")), c1);
    assertEquals(4, c1.getGroupCount());

    TermAllGroupsCollector c2 = new TermAllGroupsCollector(groupField);
    indexSearcher.search(new TermQuery(new Term("content", "some")), c2);
    assertEquals(3, c2.getGroupCount());

    TermAllGroupsCollector c3 = new TermAllGroupsCollector(groupField);
    indexSearcher.search(new TermQuery(new Term("content", "blob")), c3);
    assertEquals(2, c3.getGroupCount());

    indexSearcher.getIndexReader().close();
    dir.close();
  }
}