org.gageot.excel.core.StringCellMapper.java Source code

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Here is the source code for org.gageot.excel.core.StringCellMapper.java

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/*
 * Copyright 2002-2009 the original author or authors.
 *
 * Licensed 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.gageot.excel.core;

import java.io.IOException;
import java.text.SimpleDateFormat;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.ss.usermodel.Cell;

/**
 * CellMapper implementation that creates a <code>java.lang.String</code>
 * for each cell.
 *
 * @author David Gageot
 */
public class StringCellMapper implements CellMapper<String> {
    private static final int TEXT_CELL_FORMAT = 49;
    private static final int OPENOFFICE_TEXT_CELL_FORMAT = 165;
    private static final int OPENOFFICE_DATE_CELL_FORMAT = 167;

    private SimpleDateFormat dateFormat;

    @Override
    public String mapCell(HSSFCell cell, int rowNum, int columnNum) throws IOException {
        if (null == cell) {
            return ""; // TODO
        }

        switch (cell.getCellType()) {
        case Cell.CELL_TYPE_BLANK:
            return "";
        case Cell.CELL_TYPE_ERROR:
            return "Error<" + cell.getErrorCellValue() + ">";
        case Cell.CELL_TYPE_BOOLEAN:
            return booleanToString(cell);
        case Cell.CELL_TYPE_NUMERIC:
            return numericToString(cell);
        case Cell.CELL_TYPE_FORMULA:
            return formulaToString(cell);
        case Cell.CELL_TYPE_STRING:
        default:
            return richTextToString(cell);
        }
    }

    private String booleanToString(HSSFCell cell) {
        return cell.getBooleanCellValue() ? "VRAI" : "FAUX";
    }

    private String richTextToString(HSSFCell cell) {
        return cell.getStringCellValue();
    }

    private String numericToString(HSSFCell cell) {
        double numericValue = cell.getNumericCellValue();

        if (Double.isNaN(numericValue)) {
            return "";
        }

        if (isDateFormat(cell)) {
            if (null == dateFormat) {
                dateFormat = new SimpleDateFormat("dd/MM/yyyy");
            }

            return dateFormat.format(cell.getDateCellValue());
        }

        // For text cells, Excel still tries to converts the content into
        // numerical value. For integer content, we want to convert
        // into a String value without fraction.
        //
        if (isTextFormat(cell) && (((long) numericValue) == numericValue)) {
            return Long.toString((long) numericValue);
        }

        return Double.toString(numericValue);
    }

    private String formulaToString(HSSFCell cell) {
        if (isTextFormat(cell)) {
            return richTextToString(cell);
        }

        return numericToString(cell);
    }

    private static boolean isTextFormat(HSSFCell cell) {
        short cellFormat = cell.getCellStyle().getDataFormat();

        return ((TEXT_CELL_FORMAT == cellFormat) || (OPENOFFICE_TEXT_CELL_FORMAT == cellFormat));
    }

    private static boolean isDateFormat(HSSFCell cell) {
        short cellFormat = cell.getCellStyle().getDataFormat();

        return (OPENOFFICE_DATE_CELL_FORMAT == cellFormat);
    }
}