/*
* 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.common.tabbar;
import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
import org.rhq.core.gui.util.FacesComponentUtility;
import org.rhq.core.gui.util.UrlUtility;
/**
* A renderer that renders a {@link TabComponent} component as XHTML.
*
* @author Ian Springer
* @author Joseph Marques
*/
public class TabRenderer extends Renderer {
/**
* Encode this component.
*
* @param facesContext <code>FacesContext</code> for the current request
* @param component <code>TabComponent</code> to be encoded
*/
public void encodeBegin(FacesContext facesContext, UIComponent component) throws IOException {
TabComponent tab = (TabComponent) component;
processAttributes(tab);
// Process f:param child tags...
tab.setParameters(FacesComponentUtility.getParameters(tab));
ResponseWriter writer = facesContext.getResponseWriter();
writer.startElement("td", tab);
writer.writeAttribute("style", "vertical-align: bottom;", null);
if (!tab.isSelected()) {
writer.startElement("a", tab);
writer.writeAttribute("style", "text-decoration: none;", null);
writer.writeAttribute("href", buildURL(tab), "url");
}
writer.startElement("div", tab);
if (!tab.isSelected()) {
writer.writeAttribute("class", "tab-inactive tab-common", null);
writer.writeAttribute("onmouseover", "this.className='tab-hover tab-common'", null);
writer.writeAttribute("onmouseout", "this.className='tab-inactive tab-common'", null);
} else {
writer.writeAttribute("class", "tab-active tab-common", null);
}
String imageUrl = tab.getImage();
if (imageUrl != null) {
writer.startElement("img", tab);
writer.writeAttribute("src", imageUrl, null);
writer.endElement("img");
writer.write(" ");
}
if (tab.getDisplayName() != null) {
writer.write(tab.getDisplayName().toLowerCase());
} else {
writer.write(tab.getName().toLowerCase());
}
writer.endElement("div");
if (!tab.isSelected()) {
writer.endElement("a");
}
writer.endElement("td");
writer.startElement("td", tab);
writer.writeAttribute("style", "vertical-align: bottom;", null);
writer.startElement("div", tab);
String styleClass = "tab-spacer";
writer.writeAttribute("class", styleClass, null);
writer.writeAttribute("style", "width: 2px;", null);
writer.write(" "); // won't see this because text color will match background color
writer.endElement("div");
writer.endElement("td");
}
private void processAttributes(TabComponent tab) {
if (tab.getName() == null) {
throw new IllegalStateException("The 'tab' element requires a 'name' attribute.");
}
if (tab.getUrl() == null) {
if (tab.getChildCount() == 0) {
throw new IllegalStateException(
"The 'tab' element requires a 'url' attribute when it has no child 'subtab' elements.");
}
}
}
private String buildURL(TabComponent tab) {
String url;
SubtabComponent defaultSubtab = null;
if (tab.getSubtabs().isEmpty()) {
url = tab.getUrl();
} else {
// NOTE: If we are not the selected tab, we inherit the URL of our first (i.e. leftmost-displayed) subtab.
defaultSubtab = tab.getDefaultSubtab();
assert defaultSubtab != null;
url = defaultSubtab.getUrl();
}
// Create a master list of params from our default subtab's params (if we have subtabs), our params, and the
// params of our enclosing tabBar, in that order of precedence.
TabBarComponent tabBar = (TabBarComponent) tab.getParent();
Map<String, String> parameters = new LinkedHashMap<String, String>(tabBar.getParameters());
parameters.putAll(tab.getParameters());
if (defaultSubtab != null) {
// We need to process the subtab's f:param child tags first, since the subtab's renderer hasn't had a chance to
// do it yet!
defaultSubtab.setParameters(FacesComponentUtility.getParameters(defaultSubtab));
parameters.putAll(defaultSubtab.getParameters());
}
url = UrlUtility.addParametersToQueryString(url, parameters);
// Session-encode the URL in case the client doesn't have cookies enabled.
url = FacesContext.getCurrentInstance().getExternalContext().encodeResourceURL(url);
return url;
}
}