ContextAction.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.elephant.impl.context.action;
 
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.feed.synd.SyndFeedImpl;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedOutput;
import java.io.IOException;
import javax.servlet.ServletException;
import org.turro.elephant.context.ElephantContext;
import org.turro.elephant.context.IAction;
import org.turro.elephant.context.IElement;
import org.turro.elephant.feed.IRSSable;
import org.turro.elephant.impl.abstracts.AbstractAction;
import org.turro.elephant.web.ElContext;
import org.turro.elephant.web.ElContextMap;
 
public class ContextAction extends AbstractAction implements IAction {
 
  public ContextAction() {
  }
 
  @Override
  public int execute() throws Exception {
    String ctx = getParameter("context"),
            action = getActionParameter(),
            ctx_x = "";
 
    boolean isAJAX = false;
 
    ElContext context = ElContextMap.getContext(ctx);
    
    if(context != null) {
      if ("print".equals(action)) {
        //ensures loading metas & headers
        constructor.forceIsAContext(context);
        constructor.startBody();
        printContext(context, getIntParameter("level", 10), !"false".equals(getParameter("title")));
        constructor.setRenderingContext(null);
        constructor.endBody();
        // not true but prevents from redirecting
        isAJAX = true;
      } else if ("read".equals(action)) {
        constructor.forceIsAContext(context);
        constructor.getResponse().setContentType("text/html");
        constructor.getResponse().setCharacterEncoding(ElephantContext.getEncoding());
        constructor.setStopper(getBooleanParameter("stopper") ? "<end/>" : null);
        printContext(context, 1, false);
        constructor.setRenderingContext(null);
        // not true but prevents from redirecting
        isAJAX = true;
      } else if ("rss".equals(action)) {
        rssContext(context);
        constructor.setRenderingContext(null);
        // not true but prevents from redirecting
        isAJAX = true;
      }
    }
 
    if (!isAJAX) {
      constructor.redirect(ctx + ctx_x);
    }
 
    return IAction.DONE;
  }
 
  private void printContext(ElContext context, int level, boolean title) throws ServletException, IOException {
    if(level <= 0) return;
    if(context.canPrint() && context.getWebContext().isWikiPage()) {
      constructor.setRenderingContext(context);
      if(title) constructor.getOut().print("<div class='context-title'>" + context.getName() + "</div>");
      context.getElement().startConstruction();
      for(ElContext ctx : context.getChildren()) {
        printContext(ctx, level-1, title);
      }
    }
  }
 
  private void rssContext(ElContext context) throws IOException, FeedException {
    constructor.getResponse().setContentType("application/rss+xml");
    constructor.setRenderingContext(context);
    IElement el = context.getElement();
    if(el instanceof IRSSable) {
      SyndFeed feed = new SyndFeedImpl();
      feed.setFeedType("rss_1.0");
      feed.setEncoding(ElephantContext.getEncoding());
      feed.setTitle(ElephantContext.getSiteName() + " - " + context.getName());
      feed.setLink(ElephantContext.getServerUrl("http"));
      feed.setDescription(context.getName());
      feed.setEntries(((IRSSable) el).getSyndEntries());
      SyndFeedOutput output = new SyndFeedOutput();
      output.output(feed, constructor.getOut());
    }
  }
 
}