--- /dev/null
+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 org.apache.lucene.analysis.MockAnalyzer;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field;
+import org.apache.lucene.index.FieldInvertState;
+import org.apache.lucene.index.FieldNormModifier;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.IndexWriter;
+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 static int NUM_DOCS = 5;
+
+ public Directory store;
+
+ /** inverts the normal notion of lengthNorm */
+ public static Similarity s = new DefaultSimilarity() {
+ @Override
+ public float computeNorm(String fieldName, FieldInvertState state) {
+ return state.getBoost() * (discountOverlaps ? state.getLength() - state.getNumOverlap() : state.getLength());
+ }
+ };
+
+ @Override
+ public void setUp() throws Exception {
+ super.setUp();
+ store = newDirectory();
+ IndexWriter writer = new IndexWriter(store, newIndexWriterConfig(
+ TEST_VERSION_CURRENT, new MockAnalyzer(random)).setMergePolicy(newLogMergePolicy()));
+
+ for (int i = 0; i < NUM_DOCS; i++) {
+ Document d = new Document();
+ d.add(newField("field", "word",
+ Field.Store.YES, Field.Index.ANALYZED));
+ d.add(newField("nonorm", "word",
+ Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));
+
+ for (int j = 1; j <= i; j++) {
+ d.add(newField("field", "crap",
+ Field.Store.YES, Field.Index.ANALYZED));
+ d.add(newField("nonorm", "more words",
+ Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS));
+ }
+ writer.addDocument(d);
+ }
+ writer.close();
+ }
+
+ @Override
+ public void tearDown() throws Exception {
+ store.close();
+ super.tearDown();
+ }
+
+ public void testMissingField() throws Exception {
+ FieldNormModifier fnm = new FieldNormModifier(store, s);
+ try {
+ fnm.reSetNorms("nobodyherebutuschickens");
+ } catch (IllegalStateException e) {
+ // expected
+ }
+ }
+
+ 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 (IllegalStateException e) {
+ // expected
+ }
+
+ // 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
+ IndexReader reader = IndexReader.open(store, false);
+ searcher = new IndexSearcher(reader);
+ 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();
+ reader.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 computeNorm(String fieldName, FieldInvertState state) {
+ return state.getBoost() * (discountOverlaps ? state.getLength() - state.getNumOverlap() : state.getLength());
+ }
+ };
+ FieldNormModifier fnm = new FieldNormModifier(store, s);
+ fnm.reSetNorms("field");
+
+ // new norm (with default similarity) should put longer docs first
+ reader = IndexReader.open(store, false);
+ searcher = new IndexSearcher(reader);
+ 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();
+ reader.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];
+ }
+
+ }
+}
fnp / pylucene.git / blobdiff