org.apache.struts.faces.renderer.BaseRenderer Maven / Gradle / Ivy
/*
* $Id: BaseRenderer.java 471754 2006-11-06 14:55:09Z husted $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.struts.faces.renderer;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.beanutils.MethodUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Renderer implementation for the base tag
* from the Struts-Faces Integration Library.
*
* @version $Rev: 471754 $ $Date: 2006-11-06 08:55:09 -0600 (Mon, 06 Nov 2006) $
*/
public class BaseRenderer extends AbstractRenderer {
// -------------------------------------------------------- Static Variables
/**
* The Log instance for this class.
*/
private static Log log = LogFactory.getLog(BaseRenderer.class);
// ---------------------------------------------------------- Public Methods
/**
* Render an HTML base element.
*
* @param context FacesContext for the request we are processing
* @param component UIComponent to be rendered
*
* @exception IOException if an input/output error occurs while rendering
* @exception NullPointerException if context
* or component is null
*/
public void encodeEnd(FacesContext context, UIComponent component)
throws IOException {
if ((context == null) || (component == null)) {
throw new NullPointerException();
}
if (log.isTraceEnabled()) {
log.trace("viewId='" + context.getViewRoot().getViewId() +
"' --> uri='" + uri(context) + "'");
}
ResponseWriter writer = context.getResponseWriter();
writer.startElement("base", component);
writer.writeURIAttribute("href", uri(context), null);
String target = (String) component.getAttributes().get("target");
if (target != null) {
writer.writeAttribute("target", target, "target");
}
writer.endElement("base");
writer.writeText("\n", null);
}
// ------------------------------------------------------- Protected Methods
/**
* Return true if this is a portlet request instance.
* NOTE: Implementation must not require portlet API classes to be
* present.
*
* @param context FacesContext for the current request
*/
protected boolean isPortletRequest(FacesContext context) {
Object request = context.getExternalContext().getRequest();
Class clazz = request.getClass();
while (clazz != null) {
// Does this class implement PortletRequest?
Class interfaces[] = clazz.getInterfaces();
if (interfaces == null) {
interfaces = new Class[0];
}
for (int i = 0; i < interfaces.length; i++) {
if ("javax.portlet.PortletRequest".equals
(interfaces[i].getName())) {
return (true);
}
}
// Try our superclass (if any)
clazz = clazz.getSuperclass();
}
return (false);
}
/**
* Return true if this is a servlet request instance.
*
* @param context FacesContext for the current request
*/
protected boolean isServletRequest(FacesContext context) {
Object request = context.getExternalContext().getRequest();
return (request instanceof HttpServletRequest);
}
/**
* Return an absolute URI for the current page suitable for use
* in a portlet environment. NOTE: Implementation must not require
* portlet API classes to be present, so use reflection as needed.
*
* @param context FacesContext for the current request
*/
protected String portletUri(FacesContext context) {
Object request = context.getExternalContext().getRequest();
try {
String scheme = (String)
MethodUtils.invokeMethod(request, "getScheme", null);
StringBuffer sb = new StringBuffer(scheme);
sb.append("://");
sb.append(MethodUtils.invokeMethod(request, "getServerName", null));
Integer port = (Integer)
MethodUtils.invokeMethod(request, "getServerPort", null);
if ("http".equals(scheme) && (port.intValue() == 80)) {
;
} else if ("https".equals(scheme) && (port.intValue() == 443)) {
;
} else {
sb.append(":" + port);
}
sb.append
(MethodUtils.invokeMethod(request, "getContextPath", null));
sb.append(context.getViewRoot().getViewId());
return (sb.toString());
} catch (InvocationTargetException e) {
throw new FacesException(e.getTargetException());
} catch (Exception e) {
throw new FacesException(e);
}
}
/**
* Return an absolute URI for the current page suitable for use
* in a servlet environment.
*
* @param context FacesContext for the current request
*/
protected String servletUri(FacesContext context) {
HttpServletRequest request = (HttpServletRequest)
context.getExternalContext().getRequest();
StringBuffer sb = new StringBuffer(request.getScheme());
sb.append("://");
sb.append(request.getServerName());
if ("http".equals(request.getScheme()) &&
(80 == request.getServerPort())) {
;
} else if ("https".equals(request.getScheme()) &&
(443 == request.getServerPort())) {
;
} else {
sb.append(":" + request.getServerPort());
}
sb.append(request.getContextPath());
sb.append(context.getViewRoot().getViewId());
return (sb.toString());
}
/**
* Return the absolute URI to be rendered as the value of the
* href attribute.
*
* @param context FacesContext for the current request
*/
protected String uri(FacesContext context) {
if (isServletRequest(context)) {
return (servletUri(context));
} else if (isPortletRequest(context)) {
return (portletUri(context));
} else {
throw new IllegalArgumentException
("Request is neither HttpServletRequest nor PortletRequest");
}
}
}
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