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/*
* Copyright (c) 1997, 2018 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
*/
// CommandLinkRenderer.java
package com.sun.faces.renderkit.html_basic;
import java.io.IOException;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import javax.faces.component.UICommand;
import javax.faces.component.UIComponent;
import javax.faces.component.behavior.ClientBehavior;
import javax.faces.component.behavior.ClientBehaviorContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.event.ActionEvent;
import com.sun.faces.renderkit.Attribute;
import com.sun.faces.renderkit.AttributeManager;
import com.sun.faces.renderkit.RenderKitUtils;
/**
* CommandLinkRenderer is a class that renders the current value of
* UICommand as a HyperLink that acts like a Button.
*/
public class CommandLinkRenderer extends LinkRenderer {
private static final Attribute[] ATTRIBUTES =
AttributeManager.getAttributes(AttributeManager.Key.COMMANDLINK);
// ---------------------------------------------------------- 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)) {
component.queueEvent(new ActionEvent(context, component));
if (logger.isLoggable(Level.FINE)) {
logger.fine("This commandLink resulted in form submission " +
" ActionEvent queued.");
}
}
}
@Override
public void encodeBegin(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
boolean componentDisabled =
Boolean.TRUE.equals(component.getAttributes().get("disabled"));
if (componentDisabled) {
renderAsDisabled(context, component);
} else {
RenderKitUtils.renderJsfJsIfNecessary(context);
renderAsActive(context, component);
}
}
@Override
public void encodeChildren(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncodeChildren(component)) {
return;
}
if (component.getChildCount() > 0) {
for (UIComponent kid : component.getChildren()) {
encodeRecursive(context, kid);
}
}
}
@Override
public void encodeEnd(FacesContext context, UIComponent component)
throws IOException {
rendererParamsNotNull(context, component);
if (!shouldEncode(component)) {
return;
}
ResponseWriter writer = context.getResponseWriter();
assert(writer != null);
if (Boolean.TRUE.equals(component.getAttributes().get("disabled"))) {
writer.endElement("span");
} else {
writer.endElement("a");
}
}
@Override
public boolean getRendersChildren() {
return true;
}
// ------------------------------------------------------- Protected Methods
@Override
protected Object getValue(UIComponent component) {
return ((UICommand) component).getValue();
}
/*
* Render the necessary Javascript for the link.
* Note that much of this code is shared with CommandButtonRenderer.renderOnClick
* RELEASE_PENDING: Consolidate this code into a utility method, if possible.
*/
@Override
protected void renderAsActive(FacesContext context, UIComponent command)
throws IOException {
ResponseWriter writer = context.getResponseWriter();
assert(writer != null);
//make link act as if it's a button using javascript
writer.startElement("a", command);
writeIdAttributeIfNecessary(context, writer, command);
writer.writeAttribute("href", "#", "href");
RenderKitUtils.renderPassThruAttributes(context,
writer,
command,
ATTRIBUTES,
getNonOnClickBehaviors(command));
RenderKitUtils.renderXHTMLStyleBooleanAttributes(writer, command);
String target = (String) command.getAttributes().get("target");
if (target != null) {
target = target.trim();
} else {
target = "";
}
Collection params = getBehaviorParameters(command);
RenderKitUtils.renderOnclick(context,
command,
params,
target,
true);
writeCommonLinkAttributes(writer, command);
// render the current value as link text.
writeValue(command, writer);
writer.flush();
}
// --------------------------------------------------------- Private Methods
private static boolean wasClicked(FacesContext context,
UIComponent component,
String clientId) {
Map requestParamMap =
context.getExternalContext().getRequestParameterMap();
if (clientId == null) {
clientId = component.getClientId(context);
}
// Fire an action event if we've had a traditional (non-Ajax)
// postback, or if we've had a partial or behavior-based postback.
return (requestParamMap.containsKey(clientId) ||
RenderKitUtils.isPartialOrBehaviorAction(context, clientId));
}
// 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
// link 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 CommandLinkRenderer
