| /* |
| * 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.Terms; |
| import org.apache.lucene.queries.function.FunctionValues; |
| import org.apache.lucene.queries.function.ValueSource; |
| import org.apache.lucene.queries.function.docvalues.LongDocValues; |
| import org.apache.lucene.search.IndexSearcher; |
| |
| import java.io.IOException; |
| import java.util.Map; |
| |
| /** |
| * <code>SumTotalTermFreqValueSource</code> returns the number of tokens. |
| * (sum of term freqs across all documents, across all terms). |
| * @lucene.internal |
| */ |
| public class SumTotalTermFreqValueSource extends ValueSource { |
| protected final String indexedField; |
| |
| public SumTotalTermFreqValueSource(String indexedField) { |
| this.indexedField = indexedField; |
| } |
| |
| public String name() { |
| return "sumtotaltermfreq"; |
| } |
| |
| @Override |
| public String description() { |
| return name() + '(' + indexedField + ')'; |
| } |
| |
| @Override |
| public FunctionValues getValues(Map context, LeafReaderContext readerContext) throws IOException { |
| return (FunctionValues)context.get(this); |
| } |
| |
| @Override |
| public void createWeight(Map context, IndexSearcher searcher) throws IOException { |
| long sumTotalTermFreq = 0; |
| for (LeafReaderContext readerContext : searcher.getTopReaderContext().leaves()) { |
| Terms terms = readerContext.reader().terms(indexedField); |
| if (terms == null) continue; |
| long v = terms.getSumTotalTermFreq(); |
| assert v != -1; |
| sumTotalTermFreq += v; |
| } |
| final long ttf = sumTotalTermFreq; |
| context.put(this, new LongDocValues(this) { |
| @Override |
| public long longVal(int doc) { |
| return ttf; |
| } |
| }); |
| } |
| |
| @Override |
| public int hashCode() { |
| return getClass().hashCode() + indexedField.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this.getClass() != o.getClass()) return false; |
| SumTotalTermFreqValueSource other = (SumTotalTermFreqValueSource)o; |
| return this.indexedField.equals(other.indexedField); |
| } |
| } |