ScheduledEntitySet.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 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.scheduler.entities;
 
import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import org.jdom.output.Format;
import org.jdom.output.XMLOutputter;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.impl.util.FileUtil;
 
public class ScheduledEntitySet extends HashSet<ScheduledEntity> {
 
  public static final String
          SCHEDULER_FILE = "/WEB-INF/elephant/conf/scheduled-entities.xml";
 
  public static void saveSet(Set set) {
    Document doc = new Document(new Element("elephant-entities"));
    saveXML(doc.getRootElement(), set);
    try {
      OutputStreamWriter fw = FileUtil.getFileWriter(
              ElephantContext.getRealPath(SCHEDULER_FILE));
      Format fm = Format.getPrettyFormat();
      fm.setEncoding(ElephantContext.getEncoding());
      XMLOutputter xo = new XMLOutputter(fm);
      xo.output(doc, fw);
      fw.close();
    } catch (IOException ex) {
      Logger.getLogger(ScheduledEntitySet.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    }
  }
 
  public static void loadSet(Set set) {
    SAXBuilder builder = new SAXBuilder();
    Document doc;
    try {
      File confFile = new File(ElephantContext.getRealPath(SCHEDULER_FILE));
      if(confFile.exists()) {
        doc = builder.build(confFile);
        readXML(doc.getRootElement(), set);
      }
    } catch (IOException ex) {
      Logger.getLogger(ScheduledEntitySet.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    } catch (JDOMException ex) {
      Logger.getLogger(ScheduledEntitySet.class.getName()).log(Level.SEVERE, ElephantContext.logMsg(null), ex);
    }
  }
 
  private static void readXML(Element rootElement, Set set) {
    for(Element el : (List<Element>) rootElement.getChildren("scheduled-entity")) {
      ScheduledEntity st = new DefaultEntity(el.getAttributeValue("path"));
      st.readXML(el);
      set.add(st);
    }
  }
 
  private static void saveXML(Element rootElement, Set set) {
    for(Object st : set) {
      ((ScheduledEntity) st).writeXML(rootElement);
    }
  }
 
  public static void addEntity(ScheduledEntity scheduledEntity) {
    ScheduledEntitySet ses = new ScheduledEntitySet();
    ScheduledEntitySet.loadSet(ses);
    ses.doAddEntity(scheduledEntity);
    ScheduledEntitySet.saveSet(ses);
  }
 
  public static void removeEntity(ScheduledEntity scheduledEntity) {
    ScheduledEntitySet ses = new ScheduledEntitySet();
    ScheduledEntitySet.loadSet(ses);
    ses.remove(scheduledEntity);
    ScheduledEntitySet.saveSet(ses);
  }
 
  public static ScheduledEntity getScheduledEntity(String path) {
    ScheduledEntitySet ses = new ScheduledEntitySet();
    ScheduledEntitySet.loadSet(ses);
    for(ScheduledEntity se : ses) {
      if(se.getEntityPath().equals(path)) {
        return se;
      }
    }
    return new DefaultEntity(path);
  }
 
  private void doAddEntity(ScheduledEntity scheduledEntity) {
    remove(scheduledEntity);
    add(scheduledEntity);
  }
 
}