| /* |
| * 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.queries.function.valuesource; |
| |
| import org.apache.lucene.index.AtomicReaderContext; |
| import org.apache.lucene.index.NumericDocValues; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.queries.function.docvalues.FloatDocValues; |
| import org.apache.lucene.search.IndexSearcher; |
| import org.apache.lucene.search.similarities.TFIDFSimilarity; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * Function that returns {@link TFIDFSimilarity#decodeNormValue(long)} |
| * for every document. |
| * <p> |
| * Note that the configured Similarity for the field must be |
| * a subclass of {@link TFIDFSimilarity} |
| * @lucene.internal */ |
| public class NormValueSource extends ValueSource { |
| protected final String field; |
| public NormValueSource(String field) { |
| this.field = field; |
| } |
| |
| public String name() { |
| return "norm"; |
| } |
| |
| @Override |
| public String description() { |
| return name() + '(' + field + ')'; |
| } |
| |
| @Override |
| public void createWeight(Map context, IndexSearcher searcher) throws IOException { |
| context.put("searcher",searcher); |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, AtomicReaderContext readerContext) throws IOException { |
| IndexSearcher searcher = (IndexSearcher)context.get("searcher"); |
| final TFIDFSimilarity similarity = IDFValueSource.asTFIDF(searcher.getSimilarity(), field); |
| if (similarity == null) { |
| throw new UnsupportedOperationException("requires a TFIDFSimilarity (such as DefaultSimilarity)"); |
| } |
| final NumericDocValues norms = readerContext.reader().getNormValues(field); |
| |
| if (norms == null) { |
| return new ConstDoubleDocValues(0.0, this); |
| } |
| |
| return new FloatDocValues(this) { |
| @Override |
| public float floatVal(int doc) { |
| return similarity.decodeNormValue((byte)norms.get(doc)); |
| } |
| }; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this.getClass() != o.getClass()) return false; |
| return this.field.equals(((NormValueSource)o).field); |
| } |
| |
| @Override |
| public int hashCode() { |
| return this.getClass().hashCode() + field.hashCode(); |
| } |
| } |
| |
| |