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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;
    }
}