package org.apache.lucene.misc;
/**
* 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 java.io.IOException;
import java.util.Random;
import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.FieldNormModifier;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Collector;
import org.apache.lucene.search.DefaultSimilarity;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.Similarity;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
/**
* Tests changing the norms after changing the simularity
*/
public class TestLengthNormModifier extends LuceneTestCase {
public TestLengthNormModifier(String name) {
super(name);
}
public static int NUM_DOCS = 5;
public Directory store;
/** inverts the normal notion of lengthNorm */
public static Similarity s = new DefaultSimilarity() {
@Override
public float lengthNorm(String fieldName, int numTokens) {
return numTokens;
}
};
@Override
protected void setUp() throws Exception {
super.setUp();
Random random = newRandom();
store = newDirectory(random);
IndexWriter writer = new IndexWriter(store, newIndexWriterConfig(random,
TEST_VERSION_CURRENT, new MockAnalyzer()));
for (int i = 0; i < NUM_DOCS; i++) {
Document d = new Document();
d.add(new Field("field", "word",
Field.Store.YES, Field.Index.ANALYZED));
d.add(new Field("nonorm", "word",
Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));
for (int j = 1; j <= i; j++) {
d.add(new Field("field", "crap",
Field.Store.YES, Field.Index.ANALYZED));
d.add(new Field("nonorm", "more words",
Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));
}
writer.addDocument(d);
}
writer.close();
}
@Override
protected void tearDown() throws Exception {
store.close();
super.tearDown();
}
public void testMissingField() {
FieldNormModifier fnm = new FieldNormModifier(store, s);
try {
fnm.reSetNorms("nobodyherebutuschickens");
} catch (Exception e) {
assertNull("caught something", e);
}
}
public void testFieldWithNoNorm() throws Exception {
IndexReader r = IndexReader.open(store, false);
byte[] norms = r.norms("nonorm");
// sanity check, norms should all be 1
assertTrue("Whoops we have norms?", !r.hasNorms("nonorm"));
assertNull(norms);
r.close();
FieldNormModifier fnm = new FieldNormModifier(store, s);
try {
fnm.reSetNorms("nonorm");
} catch (Exception e) {
assertNull("caught something", e);
}
// nothing should have changed
r = IndexReader.open(store, false);
norms = r.norms("nonorm");
assertTrue("Whoops we have norms?", !r.hasNorms("nonorm"));
assertNull(norms);
r.close();
}
public void testGoodCases() throws Exception {
IndexSearcher searcher;
final float[] scores = new float[NUM_DOCS];
float lastScore = 0.0f;
// default similarity should put docs with shorter length first
searcher = new IndexSearcher(store, false);
searcher.search(new TermQuery(new Term("field", "word")), new Collector() {
private int docBase = 0;
private Scorer scorer;
@Override
public final void collect(int doc) throws IOException {
scores[doc + docBase] = scorer.score();
}
@Override
public void setNextReader(IndexReader reader, int docBase) {
this.docBase = docBase;
}
@Override
public void setScorer(Scorer scorer) throws IOException {
this.scorer = scorer;
}
@Override
public boolean acceptsDocsOutOfOrder() {
return true;
}
});
searcher.close();
lastScore = Float.MAX_VALUE;
for (int i = 0; i < NUM_DOCS; i++) {
String msg = "i=" + i + ", "+scores[i]+" <= "+lastScore;
assertTrue(msg, scores[i] <= lastScore);
//System.out.println(msg);
lastScore = scores[i];
}
// override the norms to be inverted
Similarity s = new DefaultSimilarity() {
@Override
public float lengthNorm(String fieldName, int numTokens) {
return numTokens;
}
};
FieldNormModifier fnm = new FieldNormModifier(store, s);
fnm.reSetNorms("field");
// new norm (with default similarity) should put longer docs first
searcher = new IndexSearcher(store, false);
searcher.search(new TermQuery(new Term("field", "word")), new Collector() {
private int docBase = 0;
private Scorer scorer;
@Override
public final void collect(int doc) throws IOException {
scores[doc + docBase] = scorer.score();
}
@Override
public void setNextReader(IndexReader reader, int docBase) {
this.docBase = docBase;
}
@Override
public void setScorer(Scorer scorer) throws IOException {
this.scorer = scorer;
}
@Override
public boolean acceptsDocsOutOfOrder() {
return true;
}
});
searcher.close();
lastScore = 0.0f;
for (int i = 0; i < NUM_DOCS; i++) {
String msg = "i=" + i + ", "+scores[i]+" >= "+lastScore;
assertTrue(msg, scores[i] >= lastScore);
//System.out.println(msg);
lastScore = scores[i];
}
}
}