| /* |
| * 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.LeafReaderContext; |
| import org.apache.lucene.index.IndexReader; |
| import org.apache.lucene.index.ReaderUtil; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * Returns the value of {@link IndexReader#numDocs()} |
| * for every document. This is the number of documents |
| * excluding deletions. |
| */ |
| public class NumDocsValueSource extends ValueSource { |
| public String name() { |
| return "numdocs"; |
| } |
| |
| @Override |
| public String description() { |
| return name() + "()"; |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { |
| // Searcher has no numdocs so we must use the reader instead |
| return new DocFreqValueSource.ConstIntDocValues(ReaderUtil.getTopLevelContext(readerContext).reader().numDocs(), this); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| return this.getClass() == o.getClass(); |
| } |
| |
| @Override |
| public int hashCode() { |
| return this.getClass().hashCode(); |
| } |
| } |