/*
* 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.inventory.resource;
import java.io.IOException;
import java.util.List;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
import org.rhq.core.domain.resource.Resource;
import org.rhq.enterprise.gui.common.tag.FunctionTagLibrary;
import org.rhq.enterprise.server.resource.ResourceManagerLocal;
import org.rhq.enterprise.server.util.HibernatePerformanceMonitor;
import org.rhq.enterprise.server.util.LookupUtil;
/**
* A renderer that renders a {@link ResourceLineageComponent} component as XHTML.
*
* @author Ian Springer
*/
public class ResourceLineageRenderer extends Renderer {
private static final String SEPARATOR = " > ";
/**
* Encode the beginning of the given {@link ResourceLineageComponent}.
*
* @param facesContext the JSF context for the current request
* @param component the {@link ResourceLineageComponent} to be encoded
*/
@Override
public void encodeBegin(FacesContext facesContext, UIComponent component) throws IOException {
ResourceLineageComponent resourceLineage = (ResourceLineageComponent) component;
ResponseWriter writer = facesContext.getResponseWriter();
long monitorId = HibernatePerformanceMonitor.get().start();
ResourceManagerLocal resourceManager = LookupUtil.getResourceManager();
List<Resource> ancestorResources = resourceManager.getResourceLineage(resourceLineage.getResourceId());
HibernatePerformanceMonitor.get().stop(monitorId, "ResourceLineage renderer");
if (ancestorResources.isEmpty()) {
throw new IllegalStateException(
"The list of ancestor resources should always contain at least one resource - the resource whose lineage was requested.");
}
Resource parentResource = ancestorResources.get(ancestorResources.size() - 1);
for (Resource ancestorResource : ancestorResources) {
writer.startElement("a", resourceLineage);
writer.writeAttribute("href", buildURL(ancestorResource), null);
writer.writeText(ancestorResource.getName(), null);
writer.endElement("a");
if (ancestorResource.getId() != parentResource.getId()) // separator after every item except the last one
{
writer.writeText(SEPARATOR, null);
}
}
}
private String buildURL(Resource resource) {
String url = FunctionTagLibrary.getDefaultResourceTabURL() + "?id=" + resource.getId();
// Session-encode the URL in case the client doesn't have cookies enabled.
url = FacesContext.getCurrentInstance().getExternalContext().encodeResourceURL(url);
return url;
}
}