com.openkm.extractor.MsExcelTextExtractor.java Source code

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Here is the source code for com.openkm.extractor.MsExcelTextExtractor.java

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/**
 * OpenKM, Open Document Management System (http://www.openkm.com)
 * Copyright (c) 2006-2016 Paco Avila & Josep Llort
 * <p>
 * No bytes were intentionally harmed during the development of this application.
 * <p>
 * This program 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 2 of the License, or
 * (at your option) any later version.
 * <p>
 * This program 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.
 * <p>
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package com.openkm.extractor;

import org.apache.poi.hssf.extractor.ExcelExtractor;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;

/**
 * Text extractor for Microsoft Excel sheets.
 */
public class MsExcelTextExtractor extends AbstractTextExtractor {

    /**
     * Logger instance.
     */
    private static final Logger logger = LoggerFactory.getLogger(MsExcelTextExtractor.class);

    /**
     * Force loading of dependent class.
     */
    static {
        POIFSFileSystem.class.getName();
    }

    /**
     * Creates a new <code>MsExcelTextExtractor</code> instance.
     */
    public MsExcelTextExtractor() {
        super(new String[] { "application/vnd.ms-excel", "application/msexcel", "application/excel" });
    }

    // -------------------------------------------------------< TextExtractor >

    /**
     * {@inheritDoc}
     */
    public String extractText(InputStream stream, String type, String encoding) throws IOException {
        try {
            POIFSFileSystem fs = new POIFSFileSystem(stream);
            return new ExcelExtractor(fs).getText();
        } catch (RuntimeException e) {
            logger.warn("Failed to extract Excel text content", e);
            throw new IOException(e.getMessage(), e);
        } finally {
            stream.close();
        }
    }
}