SitemapGenerator.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2018 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.elephant.sitemap;
 
import java.io.IOException;
import java.util.Collection;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.io.output.FileWriterWithEncoding;
import org.apache.commons.text.StringEscapeUtils;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.impl.util.Files;
 
public class SitemapGenerator {
  
  private final FileWriterWithEncoding writer;
 
  public SitemapGenerator() throws IOException {
     this.writer = new FileWriterWithEncoding(ElephantContext.getRealPath("/sitemap.xml"), "UTF-8");
  }
 
  public static void generateSitemap() {
    try {
      new SitemapGenerator().generate();
    } catch (IOException ex) {
      Logger.getLogger(SitemapGenerator.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    }
  }
  
  public void generate() throws IOException {
    Collection<Sitemaps.SitemapLink> links = Sitemaps.getSitemapLinks();
    writeHeader();
    for(Sitemaps.SitemapLink link : links) {
      writeEntry(link.getUrl(), link.getImages());
    }
    writeFooter();
    writer.close();
  }
  
  private void writeEntry(String url, Collection<String> imgs) throws IOException {
    url = StringEscapeUtils.escapeHtml4(url);
    writer.write(
            "  <url> \n" +
            "    <loc>" + ElephantContext.getServerBase("http") + url + "</loc> \n");
    if(imgs != null) for(String img : imgs) {
      img = StringEscapeUtils.escapeHtml4(img);
      writer.write(
              "    <image:image>\n" +
              "       <image:loc>" + ElephantContext.getServerBase("http") + img + "</image:loc>\n" +
              "       <image:caption>" + Files.file(img).getName() + "</image:caption>\n" +
              "    </image:image>\n");
    }
    writer.write("  </url>\n");
  }
  
  private void writeHeader() throws IOException {
    writer.write(
            "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
            "<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\" \n" +
            "  xmlns:image=\"http://www.google.com/schemas/sitemap-image/1.1\" \n" +
            "  xmlns:video=\"http://www.google.com/schemas/sitemap-video/1.1\">\n");
  }
  
  private void writeFooter() throws IOException {
    writer.write("</urlset>");
  }
  
}