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The Adobe Experience Manager SDK

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package org.apache.lucene.queries.function.valuesource;
/*
 * 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 org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.util.BytesRef;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.Map;

/**
 * {@link ValueSource} implementation which only returns the values from the provided
 * ValueSources which are available for a particular docId.  Consequently, when combined
 * with a {@link ConstValueSource}, this function serves as a way to return a default
 * value when the values for a field are unavailable.
 */
public class DefFunction extends MultiFunction {
  public DefFunction(List sources) {
    super(sources);
  }

  @Override
  protected String name() {
    return "def";
  }


  @Override
  public FunctionValues getValues(Map fcontext, AtomicReaderContext readerContext) throws IOException {


    return new Values(valsArr(sources, fcontext, readerContext)) {
      final int upto = valsArr.length - 1;

      private FunctionValues get(int doc) {
        for (int i=0; i