/*
 * 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.
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package org.apache.lucene.queries.function.valuesource;

import java.io.IOException;
import java.util.Map;
import java.util.Objects;

import org.apache.lucene.index.DocValues;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.NumericDocValues;
import org.apache.lucene.index.SortedNumericDocValues;
import org.apache.lucene.search.SortField;
import org.apache.lucene.search.SortedNumericSelector;
import org.apache.lucene.search.SortedNumericSelector.Type;
import org.apache.lucene.search.SortedNumericSortField;

Obtains double field values from LeafReader.getSortedNumericDocValues and using a SortedNumericSelector it gives a single-valued ValueSource view of a field.
/** * Obtains double field values from {@link org.apache.lucene.index.LeafReader#getSortedNumericDocValues} and using a * {@link org.apache.lucene.search.SortedNumericSelector} it gives a single-valued ValueSource view of a field. */
public class MultiValuedDoubleFieldSource extends DoubleFieldSource { protected final SortedNumericSelector.Type selector; public MultiValuedDoubleFieldSource(String field, Type selector) { super(field); this.selector = selector; Objects.requireNonNull(field, "Field is required to create a MultiValuedDoubleFieldSource"); Objects.requireNonNull(selector, "SortedNumericSelector is required to create a MultiValuedDoubleFieldSource"); } @Override public SortField getSortField(boolean reverse) { return new SortedNumericSortField(field, SortField.Type.DOUBLE, reverse, selector); } @Override public String description() { return "double(" + field + ',' + selector.name() + ')'; } @Override protected NumericDocValues getNumericDocValues(Map context, LeafReaderContext readerContext) throws IOException { SortedNumericDocValues sortedDv = DocValues.getSortedNumeric(readerContext.reader(), field); return SortedNumericSelector.wrap(sortedDv, selector, SortField.Type.DOUBLE); } @Override public boolean equals(Object o) { if (o.getClass() != MultiValuedDoubleFieldSource.class) return false; MultiValuedDoubleFieldSource other = (MultiValuedDoubleFieldSource)o; if (this.selector != other.selector) return false; return this.field.equals(other.field); } @Override public int hashCode() { int h = super.hashCode(); h += selector.hashCode(); return h; } }