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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
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package org.apache.poi.ss.formula.functions;

import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.NumericValueEval;
import org.apache.poi.ss.formula.eval.ValueEval;

/**
 * Implementation of the DSum function:
 * Finds the total value of matching values in a column in an area with given conditions.
 * 
 * TODO:
 * - wildcards ? and * in string conditions
 * - functions as conditions
 */
public final class DSum implements IDStarAlgorithm {
    private double totalValue = 0;

    @Override
    public boolean processMatch(ValueEval eval) {
        if(eval instanceof NumericValueEval) {
            double currentValue = ((NumericValueEval)eval).getNumberValue();
            totalValue += currentValue;
        }

        return true;
    }

    @Override
    public ValueEval getResult() {
        return new NumberEval(totalValue);
    }
}