Java tutorial
/* * RHQ Management Platform * Copyright (C) 2005-2008 Red Hat, Inc. * All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation version 2 of the License. * * 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ package org.rhq.enterprise.gui.legacy.portlet.resourcehealth; import java.io.IOException; import java.io.StringWriter; import java.util.Iterator; import javax.security.auth.login.LoginException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.util.MessageResources; import org.rhq.core.domain.resource.composite.DisambiguationReport; import org.rhq.core.domain.resource.composite.ResourceHealthComposite; import org.rhq.core.domain.util.PageControl; import org.rhq.core.domain.util.PageList; import org.rhq.enterprise.gui.common.tag.FunctionTagLibrary; import org.rhq.enterprise.gui.legacy.Constants; import org.rhq.enterprise.gui.legacy.WebUser; import org.rhq.enterprise.gui.legacy.WebUserPreferences; import org.rhq.enterprise.gui.legacy.WebUserPreferences.FavoriteResourcePortletPreferences; import org.rhq.enterprise.gui.legacy.portlet.BaseRSSAction; import org.rhq.enterprise.gui.legacy.portlet.RSSFeed; import org.rhq.enterprise.gui.legacy.taglib.display.DisambiguatedResourceLineageTag; import org.rhq.enterprise.gui.legacy.util.DisambiguatedResourceListUtil; import org.rhq.enterprise.server.resource.ResourceManagerLocal; import org.rhq.enterprise.server.util.LookupUtil; public class RSSAction extends BaseRSSAction { private static final Log log = LogFactory.getLog(RSSAction.class.getName()); @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { RSSFeed feed = getNewRSSFeed(request); ResourceManagerLocal manager = LookupUtil.getResourceManager(); // Set title MessageResources res = getResources(request); feed.setTitle(res.getMessage("dash.home.ResourceHealth")); // Get the resources health WebUser user = getWebUser(request); if (user != null) { WebUserPreferences preferences = user.getWebPreferences(); FavoriteResourcePortletPreferences favoriteResourcePreferences = preferences .getFavoriteResourcePortletPreferences(); PageList<ResourceHealthComposite> results = manager.findResourceHealth(user.getSubject(), favoriteResourcePreferences.asArray(), PageControl.getUnlimitedInstance()); if ((results != null) && (results.size() > 0)) { PageList<DisambiguationReport<ResourceHealthComposite>> list = DisambiguatedResourceListUtil .disambiguate(manager, results, ViewAction.RESOURCE_ID_EXTRACTOR); for (DisambiguationReport<ResourceHealthComposite> summary : list) { String link = feed.getBaseUrl() + FunctionTagLibrary.getDefaultResourceTabURL() + "?id=" + summary.getOriginal().getId(); String availText = res.getMessage("dash.home.ResourceHealth.rss.item.availability", summary.getOriginal().getAvailabilityType().toString()); String alertsText = res.getMessage("dash.home.ResourceHealth.rss.item.alerts", Long.valueOf(summary.getOriginal().getAlerts())); String typeText = res.getMessage("dash.home.ResourceHealth.rss.item.resourceType", summary.getOriginal().getTypeName()); String parentsText = res.getMessage("dash.home.ResourceHealth.rss.item.resourceParents", getLineage(summary)); long now = System.currentTimeMillis(); StringBuffer desc = new StringBuffer(); desc.append("<table><tr><td align=\"left\">").append(typeText).append("</td></tr>"); desc.append("<tr><td align=\"left\">").append(parentsText).append("</td></tr>"); if (favoriteResourcePreferences.showAvailability) { desc.append("<tr><td align=\"left\">").append(availText).append("</td></tr>"); } if (favoriteResourcePreferences.showAlerts) { desc.append("<tr><td align=\"left\">").append(alertsText).append("</td></tr>"); } desc.append("</table>"); feed.addItem(summary.getOriginal().getName(), link, desc.toString(), now); } } request.setAttribute("rssFeed", feed); return mapping.findForward(Constants.RSS_URL); } else { throw new LoginException("RSS access requires authentication"); } } private static String getLineage(DisambiguationReport<?> report) { StringWriter writer = new StringWriter(); try { DisambiguatedResourceLineageTag.writeParents(writer, report.getParents(), false, false); return writer.toString(); } catch (IOException e) { return ""; } } }