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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.xssf.usermodel;

import org.apache.poi.ss.formula.BaseFormulaEvaluator;
import org.apache.poi.ss.formula.EvaluationCell;
import org.apache.poi.ss.formula.EvaluationWorkbook;
import org.apache.poi.ss.formula.WorkbookEvaluator;
import org.apache.poi.ss.formula.eval.BoolEval;
import org.apache.poi.ss.formula.eval.ErrorEval;
import org.apache.poi.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.StringEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.RichTextString;

/**
 * Internal POI use only - parent of XSSF and SXSSF formula evaluators
 */
public abstract class BaseXSSFFormulaEvaluator extends BaseFormulaEvaluator {
    protected BaseXSSFFormulaEvaluator(WorkbookEvaluator bookEvaluator) {
        super(bookEvaluator);
    }
    @Override
    protected RichTextString createRichTextString(String str) {
        return new XSSFRichTextString(str);
    }

    /**
     * Turns a XSSFCell / SXSSFCell into a XSSFEvaluationCell
     */
    protected abstract EvaluationCell toEvaluationCell(Cell cell);
    
    /**
     * Returns a CellValue wrapper around the supplied ValueEval instance.
     */
    protected CellValue evaluateFormulaCellValue(Cell cell) {
        EvaluationCell evalCell = toEvaluationCell(cell);
        ValueEval eval = _bookEvaluator.evaluate(evalCell);
        if (eval instanceof NumberEval) {
            NumberEval ne = (NumberEval) eval;
            return new CellValue(ne.getNumberValue());
        }
        if (eval instanceof BoolEval) {
            BoolEval be = (BoolEval) eval;
            return CellValue.valueOf(be.getBooleanValue());
        }
        if (eval instanceof StringEval) {
            StringEval ne = (StringEval) eval;
            return new CellValue(ne.getStringValue());
        }
        if (eval instanceof ErrorEval) {
            return CellValue.getError(((ErrorEval)eval).getErrorCode());
        }
        throw new RuntimeException("Unexpected eval class (" + eval.getClass().getName() + ")");
    }
    
    protected void setCellType(Cell cell, CellType cellType) {
        if (cell instanceof  XSSFCell) {
            EvaluationWorkbook evaluationWorkbook = getEvaluationWorkbook();
            BaseXSSFEvaluationWorkbook xewb = BaseXSSFEvaluationWorkbook.class.isAssignableFrom(evaluationWorkbook.getClass()) ? (BaseXSSFEvaluationWorkbook) evaluationWorkbook : null;

            ((XSSFCell) cell).setCellType(cellType, xewb);
        } else {
            // could be an SXSSFCell
            cell.setCellType(cellType);
        }
    }
}