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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.BoolEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.EvaluationException;
import org.apache.poi.ss.formula.eval.MissingArgEval;
import org.apache.poi.ss.formula.eval.OperandResolver;
import org.apache.poi.ss.formula.eval.RefEval;
import org.apache.poi.ss.formula.eval.ValueEval;

/**
 * Here are the general rules concerning Boolean functions:
 * 
 *  Blanks are ignored (not either true or false) 
 *  Strings are ignored if part of an area ref or cell ref, otherwise they must be 'true' or 'false'
 *  Numbers: 0 is false. Any other number is TRUE 
 *  Areas: *all* cells in area are evaluated according to the above rules
 * 
 */
public abstract class BooleanFunction implements Function,ArrayFunction {

    public final ValueEval evaluate(ValueEval[] args, int srcRow, int srcCol) {
        if (args.length < 1) {
            return ErrorEval.VALUE_INVALID;
        }
        boolean boolResult;
        try {
            boolResult = calculate(args);
        } catch (EvaluationException e) {
            return e.getErrorEval();
        }
        return BoolEval.valueOf(boolResult);
    }

    private boolean calculate(ValueEval[] args) throws EvaluationException {

        boolean result = getInitialResultValue();
        boolean atLeastOneNonBlank = false;

        /*
         * Note: no short-circuit boolean loop exit because any ErrorEvals will override the result
         */
        for (final ValueEval arg : args) {
            Boolean tempVe;
            if (arg instanceof TwoDEval) {
                TwoDEval ae = (TwoDEval) arg;
                int height = ae.getHeight();
                int width = ae.getWidth();
                for (int rrIx=0; rrIx evaluate(new ValueEval[]{vA}, srcRowIndex, srcColumnIndex));
    }

    private static ValueEval evaluateFalse(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
        return args.length != 0 ? ErrorEval.VALUE_INVALID : BoolEval.FALSE;
    }

    private static ValueEval evaluateTrue(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
        return args.length != 0 ? ErrorEval.VALUE_INVALID : BoolEval.TRUE;
    }

    private static ValueEval evaluateNot(ValueEval[] args, int srcRowIndex, int srcColumnIndex) {
        if (args.length != 1) {
            return ErrorEval.VALUE_INVALID;
        }
        java.util.function.Function notInner = (va) -> {
            try {
                ValueEval ve = OperandResolver.getSingleValue(va, srcRowIndex, srcColumnIndex);
                Boolean b = OperandResolver.coerceValueToBoolean(ve, false);
                boolean boolArgVal = b != null && b;
                return BoolEval.valueOf(!boolArgVal);
            } catch (EvaluationException e) {
                return e.getErrorEval();
            }
        };

        return ArrayFunction._evaluateOneArrayArg(args[0], srcRowIndex, srcColumnIndex, notInner);
    }
}