ZipUtils.java

/**
 * Copyright © 2002 Instituto Superior Técnico
 *
 * This file is part of FenixEdu Academic.
 *
 * FenixEdu Academic 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 of the License, or
 * (at your option) any later version.
 *
 * FenixEdu Academic 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 FenixEdu Academic.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.fenixedu.academic.ui.struts.action.commons.zip;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.fenixedu.academic.domain.exceptions.DomainException;
import org.fenixedu.academic.domain.serviceRequests.AcademicServiceRequest;
import org.fenixedu.academic.domain.serviceRequests.RectorateSubmissionBatch;

public class ZipUtils {

    public void createAndFlushArchive(Set<AcademicServiceRequest> requestsToZip, HttpServletResponse response,
            RectorateSubmissionBatch batch) {
        try {
            Set<String> usedNames = new HashSet<String>();
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
            ZipOutputStream zip = new ZipOutputStream(bout);
            for (AcademicServiceRequest document : requestsToZip) {
                String filename = document.getLastGeneratedDocument().getFilename();
                if (usedNames.contains(filename)) {
                    filename = filename + "_1";
                }
                usedNames.add(filename);
                zip.putNextEntry(new ZipEntry(filename));
                zip.write(document.getLastGeneratedDocument().getContent());
                zip.closeEntry();
            }
            zip.close();
            response.setContentType("application/zip");
            response.addHeader("Content-Disposition", "attachment; filename=documentos-" + batch.getRange() + ".zip");
            ServletOutputStream writer = response.getOutputStream();
            writer.write(bout.toByteArray());
            writer.flush();
            writer.close();
            response.flushBuffer();

        } catch (IOException e) {
            throw new DomainException("error.rectorateSubmission.errorGeneratingMetadata", e);
        }
    }
}