nl.architolk.ldt.processors.ExcelConverter.java Source code

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Here is the source code for nl.architolk.ldt.processors.ExcelConverter.java

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/**
 * NAME     ExcelConverter.java
 * VERSION  1.22.0
 * DATE     2018-06-16
 *
 * Copyright 2012-2017
 *
 * This file is part of the Linked Data Theatre.
 *
 * The Linked Data Theatre is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The Linked Data Theatre is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Linked Data Theatre.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * DESCRIPTION
 * Orbeon processor to convert Excel format (xlsx) to xml
 *
 */
package nl.architolk.ldt.processors;

import org.orbeon.oxf.pipeline.api.PipelineContext;
import org.orbeon.oxf.processor.ProcessorInputOutputInfo;
import org.orbeon.oxf.processor.SimpleProcessor;
import org.orbeon.oxf.util.Base64XMLReceiver;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.orbeon.oxf.common.OXFException;
import org.xml.sax.helpers.AttributesImpl;
import org.dom4j.Document;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator;
import org.apache.poi.ss.usermodel.DataFormatter;

public class ExcelConverter extends SimpleProcessor {

    public ExcelConverter() {
        addInputInfo(new ProcessorInputOutputInfo(INPUT_DATA));
        addOutputInfo(new ProcessorInputOutputInfo(OUTPUT_DATA));
    }

    public void generateData(PipelineContext context, ContentHandler contentHandler) throws SAXException {

        try {
            // Read binary content of Excel file
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            Base64XMLReceiver base64ContentHandler = new Base64XMLReceiver(os);
            readInputAsSAX(context, INPUT_DATA, base64ContentHandler);
            final byte[] fileContent = os.toByteArray();
            final java.io.ByteArrayInputStream bais = new ByteArrayInputStream(fileContent);

            // Create workbook
            XSSFWorkbook workbook = new XSSFWorkbook(bais);
            DataFormatter formatter = new DataFormatter();
            XSSFFormulaEvaluator evaluator = new XSSFFormulaEvaluator(workbook);

            contentHandler.startDocument();
            contentHandler.startElement("", "workbook", "workbook", new AttributesImpl());

            for (int s = 0; s < workbook.getNumberOfSheets(); s++) {
                XSSFSheet sheet = workbook.getSheetAt(s);
                AttributesImpl sheetAttr = new AttributesImpl();
                sheetAttr.addAttribute("", "name", "name", "CDATA", sheet.getSheetName());
                contentHandler.startElement("", "sheet", "sheet", sheetAttr);
                for (int r = 0; r <= sheet.getLastRowNum(); r++) {
                    XSSFRow row = sheet.getRow(r);
                    if (row != null) {
                        AttributesImpl rowAttr = new AttributesImpl();
                        rowAttr.addAttribute("", "id", "id", "CDATA", Integer.toString(r));
                        contentHandler.startElement("", "row", "row", rowAttr);
                        for (int c = 0; c < row.getLastCellNum(); c++) {
                            XSSFCell cell = row.getCell(c);
                            if (cell != null) {
                                try {
                                    String cellvalue = formatter.formatCellValue(cell, evaluator);
                                    if (cellvalue != "") {
                                        AttributesImpl columnAttr = new AttributesImpl();
                                        columnAttr.addAttribute("", "id", "id", "CDATA",
                                                Integer.toString(cell.getColumnIndex()));
                                        contentHandler.startElement("", "column", "column", columnAttr);
                                        contentHandler.characters(cellvalue.toCharArray(), 0, cellvalue.length());
                                        contentHandler.endElement("", "column", "column");
                                    }
                                } catch (Exception e) {
                                }
                            }
                        }
                        contentHandler.endElement("", "row", "row");
                    }
                }
                contentHandler.endElement("", "sheet", "sheet");
            }

            contentHandler.endElement("", "workbook", "workbook");
            contentHandler.endDocument();

        } catch (IOException e) {
            throw new OXFException(e);
        }
    }
}