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.addresource; import java.util.ArrayList; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.util.LabelValueBean; import org.rhq.core.domain.auth.Subject; import org.rhq.core.domain.resource.Resource; import org.rhq.core.domain.resource.ResourceCategory; import org.rhq.core.domain.resource.ResourceType; import org.rhq.core.domain.resource.composite.DisambiguationReport; import org.rhq.core.domain.util.PageControl; import org.rhq.core.domain.util.PageList; import org.rhq.core.gui.util.StringUtility; import org.rhq.core.util.IntExtractor; 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.util.DashboardUtils; import org.rhq.enterprise.gui.legacy.util.DisambiguatedResourceListUtil; import org.rhq.enterprise.gui.legacy.util.RequestUtils; import org.rhq.enterprise.gui.legacy.util.SessionUtils; import org.rhq.enterprise.gui.util.WebUtility; import org.rhq.enterprise.server.resource.ResourceManagerLocal; import org.rhq.enterprise.server.resource.ResourceTypeManagerLocal; import org.rhq.enterprise.server.util.LookupUtil; /** * An Action that retrieves data from the user preferences of the form. The purpose of this is to add resources to the * resource health dashboard widget This implementation heavily based on: * org.rhq.enterprise.gui.admin.role.AddUsersRoleFormPrepareAction */ public class AddResourcesPrepareAction extends Action { private static final int DEFAULT_RESOURCE_TYPE = -1; private static final IntExtractor<Resource> RESOURCE_ID_EXTRACTOR = new IntExtractor<Resource>() { public int extract(Resource object) { return object.getId(); } }; @Override @SuppressWarnings({ "unchecked", "deprecation" }) public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { Log log = LogFactory.getLog(AddResourcesPrepareAction.class); AddResourcesForm addForm = (AddResourcesForm) form; HttpSession session = request.getSession(); WebUser user = RequestUtils.getWebUser(request); Subject subject = user.getSubject(); ResourceManagerLocal resourceManager = LookupUtil.getResourceManager(); PageControl pcAvail = WebUtility.getPageControl(request, "a"); PageControl pcPending = WebUtility.getPageControl(request, "p"); log.trace("available page control: " + pcAvail); log.trace("pending page control: " + pcPending); // first, get the pending resources (those that have been added to the RHS // pending resources are those on the right side of the "add to list" widget that are awaiting association with the group when the form's "ok" button is clicked. */ log.debug("check session if there are pending resources"); List<String> pendingResourceList = new ArrayList<String>(); if (session.getAttribute(Constants.PENDING_RESOURCES_SES_ATTR) == null) { // if hitting the page for the first time, load resources already associated with user via preferences log.debug("get pending resources from user preferences"); WebUserPreferences preferences = user.getWebPreferences(); pendingResourceList = preferences.getPreferenceAsList(addForm.getKey(), DashboardUtils.DASHBOARD_DELIMITER); if (pendingResourceList != null) { // otherwise, we've been here for a while but the user paged, performed changed LHS<->RHS, etc log.debug("put entire list of pending resources in session"); session.setAttribute(Constants.PENDING_RESOURCES_SES_ATTR, pendingResourceList); } } else { pendingResourceList = SessionUtils.getListAsList(session, Constants.PENDING_RESOURCES_SES_ATTR); } // get the resources, so we can display name & description in the UI log.debug("get page of pending resources selected by user"); int[] pendingResourceArray = StringUtility.getIntArray(pendingResourceList); PageList<Resource> pendingResources = resourceManager.findResourceByIds(subject, pendingResourceArray, false, pcPending); PageList<DisambiguationReport<Resource>> disambiguatedPendingResources = DisambiguatedResourceListUtil .disambiguate(resourceManager, pendingResources, RESOURCE_ID_EXTRACTOR); // give 'em to the jsp page log.debug("put selected page of pending resources in request"); request.setAttribute(Constants.PENDING_RESOURCES_ATTR, disambiguatedPendingResources); request.setAttribute(Constants.NUM_PENDING_RESOURCES_ATTR, disambiguatedPendingResources.getTotalSize()); // available resources are all resources in the system that are not associated with the user and are not pending log.debug("determine if user wants to filter available resources"); Integer typeIdFilter = ((addForm.getType() == null) || (addForm.getType() == DEFAULT_RESOURCE_TYPE)) ? null : addForm.getType(); ResourceCategory categoryFilter = (addForm.getCategory() != null) ? ResourceCategory.valueOf(addForm.getCategory().toUpperCase()) : ResourceCategory.PLATFORM; int[] excludeIds = StringUtility.getIntArray(pendingResourceList); PageList<Resource> availableResources = null; availableResources = resourceManager.findAvailableResourcesForDashboardPortlet(subject, typeIdFilter, categoryFilter, excludeIds, pcAvail); PageList<DisambiguationReport<Resource>> disambiguatedAvailableResources = DisambiguatedResourceListUtil .disambiguate(resourceManager, availableResources, RESOURCE_ID_EXTRACTOR); log.debug("put selected page of available resources in request"); request.setAttribute(Constants.AVAIL_RESOURCES_ATTR, disambiguatedAvailableResources); request.setAttribute(Constants.NUM_AVAIL_RESOURCES_ATTR, disambiguatedAvailableResources.getTotalSize()); log.debug("get the available resources user can filter by"); setDropDowns(addForm, request, subject, categoryFilter); return null; } /* * groups aren't resources anymore, so we don't support them as a category filter anymore */ private void setDropDowns(AddResourcesForm addForm, HttpServletRequest request, Subject subject, ResourceCategory category) throws Exception { // category drop-down for (ResourceCategory nextCategory : ResourceCategory.values()) { addForm.addFunction(new LabelValueBean(nextCategory.toString(), nextCategory.name())); } // type drop-down ResourceTypeManagerLocal resourceTypeManager = LookupUtil.getResourceTypeManager(); List<ResourceType> resourceTypes = resourceTypeManager.getUtilizedResourceTypesByCategory(subject, category, null); for (ResourceType nextType : resourceTypes) { addForm.addType(new LabelValueBean(nextType.getName(), String.valueOf(nextType.getId()))); } } }