org.pdfgal.pdfgalweb.services.impl.WatermarkServiceImpl.java Source code

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Here is the source code for org.pdfgal.pdfgalweb.services.impl.WatermarkServiceImpl.java

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/*
 * PDFGalWeb
 * Copyright (c) 2014, Alejandro Pernas Pan, All rights reserved.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
    
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */

package org.pdfgal.pdfgalweb.services.impl;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang3.StringUtils;
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.pdfgal.pdfgal.model.enumerated.WatermarkPosition;
import org.pdfgal.pdfgal.pdfgal.PDFGal;
import org.pdfgal.pdfgalweb.forms.DownloadForm;
import org.pdfgal.pdfgalweb.model.enumerated.CustomColor;
import org.pdfgal.pdfgalweb.services.WatermarkService;
import org.pdfgal.pdfgalweb.utils.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

@Service
public class WatermarkServiceImpl implements WatermarkService {

    @Autowired
    private FileUtils fileUtils;

    @Autowired
    private PDFGal pdfGal;

    @Override
    public DownloadForm putWatermark(final MultipartFile file, final String text, final CustomColor customColor,
            final Float alpha, final WatermarkPosition watermarkPosition, final String pages,
            final HttpServletResponse response) throws Exception {

        DownloadForm result = new DownloadForm();

        if (!file.isEmpty() && StringUtils.isNotBlank(text) && customColor != null && alpha != null
                && watermarkPosition != null && response != null) {

            final String originalName = file.getOriginalFilename();
            final String inputUri = this.fileUtils.saveFile(file);
            final String outputUri = this.fileUtils.getAutogeneratedName(originalName);

            // File is watermarked
            try {
                final List<Integer> pagesList = this.getPages(pages);
                this.pdfGal.putWatermark(inputUri, outputUri, text, customColor.getColor(), alpha,
                        watermarkPosition, pagesList);
            } catch (COSVisitorException | IOException | IllegalArgumentException e) {
                // Temporal files are deleted from system
                this.fileUtils.delete(inputUri);
                this.fileUtils.delete(outputUri);
                throw e;
            }

            // Temporal files are deleted from system
            this.fileUtils.delete(inputUri);

            result = new DownloadForm(outputUri, originalName);
        }

        return result;
    }

    /**
     * Gets the pages from a string with tokens.
     * 
     * @param pages
     * @return
     */
    private List<Integer> getPages(final String pages) {

        final List<Integer> result = new ArrayList<Integer>();

        final StringTokenizer st = new StringTokenizer(pages, ",");

        while (st.hasMoreElements()) {

            final String token = (String) st.nextElement();

            try {
                final Integer page = Integer.parseInt(token);
                result.add(page);

            } catch (final Exception e) {

                final StringTokenizer secondSt = new StringTokenizer(token, "-");
                if (secondSt.countTokens() != 2) {
                    throw new IllegalArgumentException();
                }

                final String secondTokenFirst = (String) secondSt.nextElement();
                final String secondTokenLast = (String) secondSt.nextElement();
                try {
                    final Integer firstPage = Integer.parseInt(secondTokenFirst);
                    final Integer lastPage = Integer.parseInt(secondTokenLast);
                    for (int i = firstPage; i <= lastPage; i++) {
                        result.add(i);
                    }

                } catch (final Exception e2) {
                    throw new IllegalArgumentException();
                }
            }
        }

        return result;
    }
}