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EE4J Compatible Implementation for Jakarta Faces API
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
// ButtonRenderer.java
package com.sun.faces.renderkit.html_basic;
import static com.sun.faces.renderkit.RenderKitUtils.PredefinedPostbackParameter.BEHAVIOR_SOURCE_PARAM;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import com.sun.faces.RIConstants;
import com.sun.faces.renderkit.Attribute;
import com.sun.faces.renderkit.AttributeManager;
import com.sun.faces.renderkit.RenderKitUtils;
import jakarta.faces.component.UICommand;
import jakarta.faces.component.UIComponent;
import jakarta.faces.component.behavior.ClientBehavior;
import jakarta.faces.component.behavior.ClientBehaviorContext;
import jakarta.faces.context.FacesContext;
import jakarta.faces.context.ResponseWriter;
import jakarta.faces.event.ActionEvent;
/**
* ButtonRenderer is a class that renders the current value of UICommand as a Button.
*/
public class ButtonRenderer extends HtmlBasicRenderer {
private static final Attribute[] ATTRIBUTES = AttributeManager.getAttributes(AttributeManager.Key.COMMANDBUTTON);
// ---------------------------------------------------------- Public Methods
@Override
public void decode(FacesContext context, UIComponent component) {
rendererParamsNotNull(context, component);
if (!shouldDecode(component)) {
return;
}
String clientId = decodeBehaviors(context, component);
if (wasClicked(context, component, clientId) && !isReset(component)) {
component.queueEvent(new ActionEvent(context, component));
if (logger.isLoggable(Level.FINE)) {
logger.fine("This command resulted in form submission " + " ActionEvent queued.");
logger.log(Level.FINE, "End decoding component {0}", component.getId());
}
}
}
@Override
public void encodeBegin(FacesContext context, UIComponent component) throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
// Which button type (SUBMIT, RESET, or BUTTON) should we generate?
String type = getButtonType(component);
ResponseWriter writer = context.getResponseWriter();
assert writer != null;
String label = "";
Object value = ((UICommand) component).getValue();
if (value != null) {
label = value.toString();
}
/*
* If we have any parameters and the button type is submit or button, then render Javascript to use later.
* RELEASE_PENDING this logic is slightly wrong - we should buffer the user onclick, and use it later. Leaving it for
* when we decide how to do script injection.
*/
Collection params = getBehaviorParameters(component);
if (!params.isEmpty() && (type.equals("submit") || type.equals("button"))) {
RenderKitUtils.renderFacesJsIfNecessary(context);
}
String imageSrc = (String) component.getAttributes().get("image");
writer.startElement("input", component);
writeIdAttributeIfNecessary(context, writer, component);
String clientId = component.getClientId(context);
if (imageSrc != null) {
writer.writeAttribute("type", "image", "type");
writer.writeURIAttribute("src", RenderKitUtils.getImageSource(context, component, "image"), "image");
writer.writeAttribute("name", clientId, "clientId");
String alt = (String) component.getAttributes().get("alt");
if (alt != null) {
writer.writeAttribute("alt", alt, "alt");
}
else if (writer.getContentType().equals(RIConstants.XHTML_CONTENT_TYPE)) {
writer.writeAttribute("alt", "", "alt"); // write out an empty alt as it is required by HTML spec.
}
} else {
writer.writeAttribute("type", type, "type");
writer.writeAttribute("name", clientId, "clientId");
writer.writeAttribute("value", label, "value");
}
RenderKitUtils.renderPassThruAttributes(context, writer, component, ATTRIBUTES, getNonOnClickBehaviors(component));
RenderKitUtils.renderXHTMLStyleBooleanAttributes(writer, component);
String styleClass = (String) component.getAttributes().get("styleClass");
if (styleClass != null && styleClass.length() > 0) {
writer.writeAttribute("class", styleClass, "styleClass");
}
RenderKitUtils.renderOnclick(context, component, params, null, false);
// PENDING(edburns): Prior to i_spec_1111, this element
// was rendered unconditionally
if (component.getChildCount() == 0) {
writer.endElement("input");
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component) throws IOException {
rendererParamsNotNull(context, component);
// PENDING(edburns): Prior to i_spec_1111, this element
// was rendered unconditionally
if (component.getChildCount() > 0) {
context.getResponseWriter().endElement("input");
}
}
// --------------------------------------------------------- Private Methods
/**
*
* Determine if this component was activated on the client side.
*
*
* @param context the FacesContext for the current request
* @param component the component of interest
* @param clientId the client id, if it has been retrieved, otherwise null
* @return true if this component was in fact activated, otherwise false
*/
private static boolean wasClicked(FacesContext context, UIComponent component, String clientId) {
// Was our command the one that caused this submission?
// we don' have to worry about getting the value from request parameter
// because we just need to know if this command caused the submission. We
// can get the command name by calling currentValue. This way we can
// get around the IE bug.
if (clientId == null) {
clientId = component.getClientId(context);
}
if (context.getPartialViewContext().isAjaxRequest()) {
return BEHAVIOR_SOURCE_PARAM.getValue(context).equals(clientId);
} else {
Map requestParameterMap = context.getExternalContext().getRequestParameterMap();
if (requestParameterMap.get(clientId) == null) {
// Check to see whether we've got an action event
// as a result of a partial/behavior postback.
if (RenderKitUtils.isPartialOrBehaviorAction(context, clientId)) {
return true;
}
StringBuilder builder = new StringBuilder(clientId);
String xValue = builder.append(".x").toString();
builder.setLength(clientId.length());
String yValue = builder.append(".y").toString();
return requestParameterMap.get(xValue) != null && requestParameterMap.get(yValue) != null;
}
return true;
}
}
/**
* @param component the component of interest
* @return true if the button represents a reset button, otherwise false
*/
private static boolean isReset(UIComponent component) {
return "reset".equals(component.getAttributes().get("type"));
}
/**
*
* If the component's type attribute is null or not equal to reset, submit or
* button, default to submit.
*
* @param component the component of interest
* @return the type for this button
*/
private static String getButtonType(UIComponent component) {
String type = (String) component.getAttributes().get("type");
if (type == null || !"reset".equals(type) && !"submit".equals(type) && !"button".equals(type)) {
type = "submit";
// This is needed in the decode method
component.getAttributes().put("type", type);
}
return type;
}
// Returns the Behaviors map, but only if it contains some entry other
// than those handled by renderOnclick(). This helps us optimize
// renderPassThruAttributes() in the very common case where the
// button only contains an "action" (or "click") Behavior. In that
// we pass a null Behaviors map into renderPassThruAttributes(),
// which allows us to take a more optimized code path.
private static Map> getNonOnClickBehaviors(UIComponent component) {
return getPassThruBehaviors(component, "click", "action");
}
} // end of class ButtonRenderer