org.apache.struts.faces.renderer.CommandLinkRenderer Maven / Gradle / Ivy
/*
* $Id$
*
* 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.util.Iterator;
import javax.faces.component.NamingContainer;
import javax.faces.component.UIComponent;
import javax.faces.component.UIForm;
import javax.faces.component.UIParameter;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.event.ActionEvent;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* Renderer implementation for the commandLink
* tag from the Struts-Faces Integration Library.
*
* @version $Rev$ $Date$
*/
public class CommandLinkRenderer extends AbstractRenderer {
// -------------------------------------------------------- Static Variables
/**
* Token for private names.
*/
private final static String TOKEN =
"org_apache_struts_faces_renderer_CommandLinkRenderer";
/**
* The Log instance for this class.
*/
private final static Log LOG = LogFactory.getLog(CommandLinkRenderer.class);
// ---------------------------------------------------------- Public Methods
/**
* Perform setup processing that will be required for decoding the
* incoming request.
*
* @param context FacesContext for the request we are processing
* @param component UIComponent to be processed
*
* @exception NullPointerException if context
* or component is null
*/
public void decode(FacesContext context, UIComponent component) {
// Implement spec requirements on NullPointerException
if ((context == null) || (component == null)) {
throw new NullPointerException();
}
// Skip this component if it is not relevant
if (!component.isRendered() || isDisabled(component) ||
isReadOnly(component)) {
return;
}
// Set up variables we will need
UIForm form = null;
UIComponent parent = component.getParent();
while (parent != null) {
if (parent instanceof UIForm) {
form = (UIForm) parent;
break;
}
parent = parent.getParent();
}
if (form == null) {
LOG.warn("CommandLinkComponent not nested inside UIForm, ignored");
return;
}
// Was this the component that submitted this form?
String paramId = TOKEN;
String value = context.getExternalContext().getRequestParameterMap().get(paramId);
if ((value == null) || !value.equals(component.getClientId(context))) {
if (LOG.isTraceEnabled()) {
LOG.trace("decode(" + component.getId() + ") --> not active");
}
return;
}
// Queue an ActionEvent from this component
if (LOG.isTraceEnabled()) {
LOG.trace("decode(" + component.getId() + ") --> queueEvent()");
}
component.queueEvent(new ActionEvent(component));
}
private static String passThrough[] =
{ "accesskey", "charset", "dir", "hreflang", "lang", "onblur",
/* "onclick", */ "ondblclick", "onfocus", "onkeydown",
"onkeypress", "onkeyup", "onmousedown", "onmousemove",
"onmouseout", "onmouseover", "onmouseup", "rel", "rev",
"style", "tabindex", "target", "title", "type" };
/**
* Render the beginning of a hyperlink to submit this form.
*
* @param context FacesContext for the request we are processing
* @param component UIComponent to be rendered
* @param writer ResponseWriter we are rendering to
*
* @exception IOException if an input/output error occurs while rendering
* @exception NullPointerException if context
* or component is null
*/
public void renderStart(FacesContext context, UIComponent component,
ResponseWriter writer)
throws IOException {
// Skip this component if it is not relevant
if (!component.isRendered() || isDisabled(component) ||
isReadOnly(component)) {
return;
}
// Set up variables we will need
UIForm form = null;
UIComponent parent = component.getParent();
while (parent != null) {
if (parent instanceof UIForm) {
form = (UIForm) parent;
break;
}
parent = parent.getParent();
}
if (form == null) {
LOG.warn("CommandLinkComponent not nested inside UIForm, ignored");
return;
}
String formClientId = form.getClientId(context);
// If this is the first nested command link inside this form,
// render a hidden variable to identify which link did the submit
String key = formClientId + NamingContainer.SEPARATOR_CHAR + TOKEN;
if (context.getExternalContext().getRequestMap().get(key) == null) {
writer.startElement("input", null);
writer.writeAttribute("name", TOKEN, null);
writer.writeAttribute("type", "hidden", null);
writer.writeAttribute("value", "", null);
writer.endElement("input");
context.getExternalContext().getRequestMap().put
(key, Boolean.TRUE);
}
// Render the beginning of this hyperlink
writer.startElement("a", component);
}
/**
* Render the attributes of a hyperlink to submit this form.
*
* @param context FacesContext for the request we are processing
* @param component UIComponent to be rendered
* @param writer ResponseWriter we are rendering to
*
* @exception IOException if an input/output error occurs while rendering
* @exception NullPointerException if context
* or component is null
*/
public void renderAttributes(FacesContext context, UIComponent component,
ResponseWriter writer)
throws IOException {
// Skip this component if it is not relevant
if (!component.isRendered() || isDisabled(component) ||
isReadOnly(component)) {
return;
}
// Set up variables we will need
UIComponent form = null;
UIComponent parent = component.getParent();
while (parent != null) {
if (parent instanceof UIForm ||
"org.apache.myfaces.trinidad.Form".equals(parent.getFamily()) ||
"oracle.adf.Form".equals(parent.getFamily())) {
form = parent;
break;
}
parent = parent.getParent();
}
if (form == null) {
LOG.warn("CommandLinkComponent not nested inside UIForm, ignored");
return;
}
String formClientId = form.getClientId(context);
// Render the attributes of this hyperlink
if (component.getId() != null) {
writer.writeAttribute("id", component.getClientId(context), "id");
}
writer.writeAttribute("href", "#", null);
String styleClass = (String)
component.getAttributes().get("styleClass");
if (styleClass != null) {
writer.writeAttribute("class", styleClass, "styleClass");
}
renderPassThrough(context, component, writer, passThrough);
// Render the JavaScript content of the "onclick" element
StringBuilder sb = new StringBuilder();
sb.append("document.forms['");
sb.append(formClientId);
sb.append("']['");
sb.append(TOKEN);
sb.append("'].value='");
sb.append(component.getClientId(context));
sb.append("';");
Iterator kids = component.getChildren().iterator();
while (kids.hasNext()) {
UIComponent kid = (UIComponent) kids.next();
if (!(kid instanceof UIParameter)) {
continue;
}
sb.append("document.forms['");
sb.append(formClientId);
sb.append("']['");
sb.append((String) kid.getAttributes().get("name"));
sb.append("'].value='");
sb.append((String) kid.getAttributes().get("value"));
sb.append("';");
}
sb.append("document.forms['");
sb.append(formClientId);
sb.append("'].submit(); return false;");
writer.writeAttribute("onclick", sb.toString(), null);
// Render the component value as the hyperlink text
Object value = component.getAttributes().get("value");
if (value != null) {
if (value instanceof String) {
writer.write((String) value);
} else {
writer.write(value.toString());
}
}
}
/**
* Render the end of a hyperlink to submit this form.
*
* @param context FacesContext for the request we are processing
* @param component UIComponent to be rendered
* @param writer ResponseWriter we are rendering to
*
* @exception IOException if an input/output error occurs while rendering
* @exception NullPointerException if context
* or component is null
*/
public void renderEnd(FacesContext context, UIComponent component,
ResponseWriter writer)
throws IOException {
// Skip this component if it is not relevant
if (!component.isRendered() || isDisabled(component) ||
isReadOnly(component)) {
return;
}
// Render the beginning of this hyperlink
writer.endElement("a");
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy