newsfeedreadertag.java

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/*
 * Copyright (c) 2003-2006, Simon Brown
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   - Neither the name of Pebble nor the names of its contributors may
 *     be used to endorse or promote products derived from this software
 *     without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package net.sourceforge.pebble.web.tagext;

import net.sourceforge.pebble.aggregator.NewsFeed;
import net.sourceforge.pebble.aggregator.NewsFeedCache;
import net.sourceforge.pebble.domain.Blog;
import net.sourceforge.pebble.Constants;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspContext;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Gets entries for the specified news feed. 
 *
 * @author    Simon Brown
 */
public class NewsFeedReaderTag extends SimpleTagSupport {

  private static final Log log = LogFactory.getLog(NewsFeedReaderTag.class);

  private String url;

  public void doTag() throws JspException, IOException {
    NewsFeed feed = NewsFeedCache.getInstance().getFeed(url);
    getJspContext().setAttribute("feedEntries", feed.getEntries());
  }

  public void setUrl(String url) {
    this.url = url;

    if (url != null) {
      Blog blog = (Blog)getJspContext().getAttribute(Constants.BLOG_KEY, PageContext.REQUEST_SCOPE);
      NewsFeedCache.getInstance().addSubscription(blog, url);
    }
  }

}