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* 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.mahout.utils.vectors.lucene;
import java.io.IOException;
import com.google.common.io.Closeables;
import org.apache.lucene.analysis.core.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;
import org.apache.mahout.common.MahoutTestCase;
import org.junit.Before;
import org.junit.Test;
public class CachedTermInfoTest extends MahoutTestCase {
private RAMDirectory directory;
private static final String[] DOCS = {
"a a b b c c",
"a b a b a b a b",
"a b a",
"a",
"b",
"a",
"a"
};
private static final String[] DOCS2 = {
"d d d d",
"e e e e",
"d e d e",
"d",
"e",
"d",
"e"
};
@Before
public void before() throws IOException {
directory = new RAMDirectory();
FieldType fieldType = new FieldType();
fieldType.setStored(false);
fieldType.setIndexed(true);
fieldType.setTokenized(true);
fieldType.setStoreTermVectors(false);
fieldType.setStoreTermVectorPositions(false);
fieldType.setStoreTermVectorOffsets(false);
fieldType.freeze();
directory = createTestIndex(fieldType, directory, 0);
}
@Test
public void test() throws Exception {
IndexReader reader = DirectoryReader.open(directory);
CachedTermInfo cti = new CachedTermInfo(reader, "content", 0, 100);
assertEquals(3, cti.totalTerms("content"));
assertNotNull(cti.getTermEntry("content", "a"));
assertNull(cti.getTermEntry("content", "e"));
//minDf
cti = new CachedTermInfo(reader, "content", 3, 100);
assertEquals(2, cti.totalTerms("content"));
assertNotNull(cti.getTermEntry("content", "a"));
assertNull(cti.getTermEntry("content", "c"));
//maxDFPercent, a is in 6 of 7 docs: numDocs * maxDfPercent / 100 < 6 to exclude, 85% should suffice to exclude a
cti = new CachedTermInfo(reader, "content", 0, 85);
assertEquals(2, cti.totalTerms("content"));
assertNotNull(cti.getTermEntry("content", "b"));
assertNotNull(cti.getTermEntry("content", "c"));
assertNull(cti.getTermEntry("content", "a"));
}
static RAMDirectory createTestIndex(FieldType fieldType,
RAMDirectory directory,
int startingId) throws IOException {
IndexWriter writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_46, new WhitespaceAnalyzer(Version.LUCENE_46)));
try {
for (int i = 0; i < DOCS.length; i++) {
Document doc = new Document();
Field id = new StringField("id", "doc_" + (i + startingId), Field.Store.YES);
doc.add(id);
Field text = new Field("content", DOCS[i], fieldType);
doc.add(text);
Field text2 = new Field("content2", DOCS2[i], fieldType);
doc.add(text2);
writer.addDocument(doc);
}
} finally {
Closeables.close(writer, false);
}
return directory;
}
}