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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;

import org.apache.poi.ss.formula.TwoDEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.MissingArgEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.formula.functions.CountUtils.I_MatchPredicate;
import org.apache.poi.ss.formula.functions.CountUtils.I_MatchAreaPredicate;

/**
 * Counts the number of cells that contain numeric data within
 *  the list of arguments.
 *
 * Excel Syntax
 * COUNT(value1,value2,...)
 * Value1, value2, ...   are 1 to 30 arguments representing the values or ranges to be counted.
 *
 * TODO: Check this properly matches excel on edge cases
 *  like formula cells, error cells etc
 */
public final class Count implements Function {
    private final I_MatchPredicate _predicate;

    public Count(){
        _predicate = defaultPredicate;
    }

    private Count(I_MatchPredicate criteriaPredicate){
        _predicate = criteriaPredicate;
    }

	public ValueEval evaluate(ValueEval[] args, int srcCellRow, int srcCellCol) {
		int nArgs = args.length;
		if (nArgs < 1) {
			// too few arguments
			return ErrorEval.VALUE_INVALID;
		}

		if (nArgs > 30) {
			// too many arguments
			return ErrorEval.VALUE_INVALID;
		}

		int temp = 0;

		for(int i=0; i
     *     If there are other subtotals within argument refs (or nested subtotals),
     *     these nested subtotals are ignored to avoid double counting.
     * 
     * @param includeHiddenRows true to include hidden rows in the aggregate, false to skip them
     * @return function
     *
     *  @see Subtotal
     */
    public static Count subtotalInstance(boolean includeHiddenRows) {
        return new Count(includeHiddenRows ? subtotalPredicate : subtotalVisibleOnlyPredicate);
    }
}