org.olat.modules.qpool.manager.ExportQItemResource.java Source code

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Here is the source code for org.olat.modules.qpool.manager.ExportQItemResource.java

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/**
 * <a href="http://www.openolat.org">
 * OpenOLAT - Online Learning and Training</a><br>
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License"); <br>
 * you may not use this file except in compliance with the License.<br>
 * You may obtain a copy of the License at the
 * <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache homepage</a>
 * <p>
 * Unless required by applicable law or agreed to in writing,<br>
 * software distributed under the License is distributed on an "AS IS" BASIS, <br>
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
 * See the License for the specific language governing permissions and <br>
 * limitations under the License.
 * <p>
 * Initial code contributed and copyrighted by<br>
 * frentix GmbH, http://www.frentix.com
 * <p>
 */
package org.olat.modules.qpool.manager;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashSet;
import java.util.Set;
import java.util.zip.ZipOutputStream;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.olat.core.CoreSpringFactory;
import org.olat.core.gui.media.MediaResource;
import org.olat.core.logging.OLog;
import org.olat.core.logging.Tracing;
import org.olat.core.util.StringHelper;
import org.olat.modules.qpool.QPoolService;
import org.olat.modules.qpool.QuestionItemShort;

/**
 * 
 * Initial date: 11.03.2013<br>
 * @author srosse, stephane.rosse@frentix.com, http://www.frentix.com
 *
 */
public class ExportQItemResource implements MediaResource {

    private static final OLog log = Tracing.createLoggerFor(ExportQItemResource.class);

    private String encoding;
    private final QuestionItemShort item;

    public ExportQItemResource(String encoding, QuestionItemShort item) {
        this.encoding = encoding;
        this.item = item;
    }

    @Override
    public boolean acceptRanges() {
        return false;
    }

    @Override
    public String getContentType() {
        return "application/octet-stream";
    }

    @Override
    public Long getSize() {
        return null;
    }

    @Override
    public InputStream getInputStream() {
        return null;
    }

    @Override
    public Long getLastModified() {
        return null;
    }

    @Override
    public void prepare(HttpServletResponse hres) {
        try {
            hres.setCharacterEncoding(encoding);
        } catch (Exception e) {
            log.error("", e);
        }

        String label = item.getTitle();
        String file = StringHelper.transformDisplayNameToFileSystemName(label) + ".zip";
        String encodedFileName = StringHelper.urlEncodeUTF8(file);
        hres.setHeader("Content-Disposition", "attachment; filename*=UTF-8''" + encodedFileName);
        hres.setHeader("Content-Description", encodedFileName);

        ZipOutputStream zout = null;
        try {
            zout = new ZipOutputStream(hres.getOutputStream());
            zout.setLevel(9);
            Set<String> names = new HashSet<String>();
            QPoolService qpoolService = CoreSpringFactory.getImpl(QPoolService.class);
            qpoolService.exportItem(item, zout, names);
        } catch (IOException e) {
            log.error("", e);
        } finally {
            IOUtils.closeQuietly(zout);
        }
    }

    @Override
    public void release() {
        //
    }
}