com.openkm.extractor.BarcodeTextExtractor.java Source code

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

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/**
 * OpenKM, Open Document Management System (http://www.openkm.com)
 * Copyright (c) 2006-2015 Paco Avila & Josep Llort
 * 
 * No bytes were intentionally harmed during the development of this application.
 * 
 * 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.
 * 
 * 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.
 * 
 * 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 java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import org.apache.commons.io.IOUtils;
import org.apache.jackrabbit.extractor.AbstractTextExtractor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.LuminanceSource;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.NotFoundException;
import com.google.zxing.Result;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.multi.GenericMultipleBarcodeReader;
import com.google.zxing.multi.MultipleBarcodeReader;

/**
 * Text extractor for image documents.
 * Use OCR from https://code.launchpad.net/cuneiform-linux
 */
public class BarcodeTextExtractor extends AbstractTextExtractor {

    /**
     * Logger instance.
     */
    private static final Logger log = LoggerFactory.getLogger(BarcodeTextExtractor.class);

    /**
     * Creates a new <code>TextExtractor</code> instance.
     */
    public BarcodeTextExtractor() {
        super(new String[] { "image/tiff", "image/gif", "image/jpeg", "image/png" });
    }

    /**
     * Use in AbbyTextExtractor subclass
     */
    public BarcodeTextExtractor(String[] contentTypes) {
        super(contentTypes);
    }

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

    /**
     * {@inheritDoc}
     */
    public Reader extractText(InputStream stream, String type, String encoding) throws IOException {
        try {
            BufferedImage image = ImageIO.read(stream);
            String text = multiple(image);
            return new StringReader(text);
        } catch (Exception e) {
            log.warn("Failed to extract barcode text", e);
            return new StringReader("");
        } finally {
            IOUtils.closeQuietly(stream);
        }
    }

    /**
     * Decode only one barcode
     */
    @SuppressWarnings("unused")
    private String simple(BufferedImage img) throws NotFoundException, ChecksumException, FormatException {
        long begin = System.currentTimeMillis();
        LuminanceSource source = new BufferedImageLuminanceSource(img);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        com.google.zxing.Reader reader = new MultiFormatReader();
        Result result = reader.decode(bitmap);

        log.trace("simple.Time: {}", System.currentTimeMillis() - begin);
        return result.getText();
    }

    /**
     * Decode all barcodes in the image
     */
    private String multiple(BufferedImage img) throws NotFoundException, ChecksumException, FormatException {
        long begin = System.currentTimeMillis();
        LuminanceSource source = new BufferedImageLuminanceSource(img);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        com.google.zxing.Reader reader = new MultiFormatReader();
        MultipleBarcodeReader bcReader = new GenericMultipleBarcodeReader(reader);
        Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();
        hints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
        StringBuilder sb = new StringBuilder();

        for (Result result : bcReader.decodeMultiple(bitmap, hints)) {
            sb.append(result.getText()).append(" ");
        }

        log.trace("multiple.Time: {}", System.currentTimeMillis() - begin);
        return sb.toString();
    }
}