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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*
 *  ====================================================================
 *    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.poi.ss.formula.functions;

/**
 * Implementation for the Excel function SUMIFS
 *
 * Syntax : 

 *  SUMIFS ( sum_range, criteria_range1, criteria1,
 *  [criteria_range2,  criteria2], ...) 

 *    

 *      sum_range Required. One or more cells to sum, including numbers or names, ranges,
 *      or cell references that contain numbers. Blank and text values are ignored.
 *      criteria1_range Required. The first range in which
 *      to evaluate the associated criteria.
 *      criteria1 Required. The criteria in the form of a number, expression,
 *        cell reference, or text that define which cells in the criteria_range1
 *        argument will be added
 *       criteria_range2, criteria2, ...    Optional. Additional ranges and their associated criteria.
 *      Up to 127 range/criteria pairs are allowed.
 *    

 * 
 *
 */
public final class Sumifs extends Baseifs {
    /**
     * Singleton
     */
    public static final FreeRefFunction instance = new Sumifs();

    /**
     * https://support.office.com/en-us/article/SUMIFS-function-c9e748f5-7ea7-455d-9406-611cebce642b
     * COUNTIFS(sum_range, criteria_range1, criteria1, [criteria_range2, criteria2], ...
     * need at least 3 arguments and need to have an odd number of arguments (sum-range plus x*(criteria_range, criteria))
     * @see org.apache.poi.ss.formula.functions.Baseifs#hasInitialRange()
     */
    @Override
    protected boolean hasInitialRange() {
        return true;
    }
}