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/*
* Copyright 2020 OmniFaces
*
* Licensed 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
*
* https://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.omnifaces.util;
import static org.omnifaces.util.Components.getAttribute;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import javax.faces.component.UIComponent;
import javax.faces.component.behavior.ClientBehaviorHolder;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
/**
* Collection of utility methods for the JSF API with respect to working with {@link Renderer}.
*
* @author Bauke Scholtz
* @since 1.5
*/
public final class Renderers {
// Constants --------------------------------------------------------------------------------------------------
/** Renderer type of standard JSF stylesheet component resource. */
public static final String RENDERER_TYPE_CSS = "javax.faces.resource.Stylesheet";
/** Renderer type of standard JSF script component resource. */
public static final String RENDERER_TYPE_JS = "javax.faces.resource.Script";
// Constructors ---------------------------------------------------------------------------------------------------
private Renderers() {
// Hide constructor.
}
// Text -----------------------------------------------------------------------------------------------------------
/**
* Write the given text either HTML-escaped or unescaped. Beware of potential XSS attack holes when user-controlled
* input is written unescaped!
* @param writer The involved response writer.
* @param component The associated UI component, usually the parent component.
* @param text The text to be written.
* @param escape Whether to HTML-escape the given text or not.
* @throws IOException When an I/O error occurs.
*/
public static void writeText(ResponseWriter writer, UIComponent component, String text, boolean escape)
throws IOException
{
if (escape) {
writer.writeText(text, component, null);
}
else {
writer.write(text);
}
}
// Attributes -----------------------------------------------------------------------------------------------------
/**
* Write component attribute of the given name, if it's not empty.
* Both HTML attribute name and component property name defaults to the given component attribute name.
* @param writer The involved response writer.
* @param component The associated UI component, usually the parent component.
* @param name The component attribute name whose value should be written.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
*/
public static void writeAttribute(ResponseWriter writer, UIComponent component, String name) throws IOException {
writeAttribute(writer, name, getAttribute(component, name), name);
}
/**
* Write component attribute of the given name, if it's not empty, as given HTML attribute name.
* Component property name defaults to the given component attribute name.
* @param writer The involved response writer.
* @param component The associated UI component, usually the parent component.
* @param name The component attribute name whose value should be written.
* @param html The HTML attribute name to be written.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
*/
public static void writeAttribute(ResponseWriter writer, UIComponent component, String name, String html)
throws IOException
{
writeAttribute(writer, html, getAttribute(component, name), name);
}
/**
* Write component attribute of the given name, if it's not empty, as given HTML attribute name associated with
* given component property name.
* @param writer The involved response writer.
* @param component The associated UI component, usually the parent component.
* @param name The component attribute name whose value should be written.
* @param html The HTML attribute name to be written.
* @param property The associated component property name.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
*/
public static void writeAttribute
(ResponseWriter writer, UIComponent component, String name, String html, String property)
throws IOException
{
writeAttribute(writer, html, getAttribute(component, name), property);
}
/**
* Write given attribute value, if it's not empty, as given HTML attribute name.
* Component property name defaults to given HTML attribute name.
* @param writer The involved response writer.
* @param html The HTML attribute name to be written.
* @param value The HTML attribute value to be written.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
*/
public static void writeAttribute(ResponseWriter writer, String html, Object value) throws IOException {
writeAttribute(writer, html, value, html);
}
/**
* Write given attribute value, if it's not empty, as given HTML attribute name associated with given component
* property name.
* @param writer The involved response writer.
* @param html The HTML attribute name to be written.
* @param value The HTML attribute value to be written.
* @param property The associated component property name.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
*/
public static void writeAttribute(ResponseWriter writer, String html, Object value, String property)
throws IOException
{
if (value != null) {
writer.writeAttribute(html, value, property);
}
}
/**
* Write component attributes of the given names, if it's not empty.
* Both HTML attribute name and component property name defaults to the given component attribute name.
* @param writer The involved response writer.
* @param component The associated UI component, usually the parent component.
* @param names The names of the attributes to be written.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
*/
public static void writeAttributes(ResponseWriter writer, UIComponent component, String... names)
throws IOException
{
for (String name : names) {
writeAttribute(writer, name, getAttribute(component, name), name);
}
}
/**
* Write component attributes of the given property-HTML mapping of names, if it's not empty.
* Map key will be used as component property name and map value will be used as HTML attribute name.
* @param writer The involved response writer.
* @param component The associated UI component, usually the parent component.
* @param names Mapping of component property-HTML attribute names of the attributes to be written.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
*/
public static void writeAttributes(ResponseWriter writer, UIComponent component, Map names)
throws IOException
{
for (Entry entry : names.entrySet()) {
String name = entry.getKey();
String html = entry.getValue();
writeAttribute(writer, html, getAttribute(component, name), name);
}
}
/**
* Write ID of component if necessary. That is, when it's explicitly set or the component has client behaviors.
* @param writer The involved response writer.
* @param component The associated UI component.
* @throws IOException When an I/O error occurs.
* @see ResponseWriter#writeAttribute(String, Object, String)
* @since 2.5
*/
public static void writeIdAttributeIfNecessary(ResponseWriter writer, UIComponent component) throws IOException {
if (component.getId() != null
|| (component instanceof ClientBehaviorHolder
&& !((ClientBehaviorHolder) component).getClientBehaviors().isEmpty()))
{
writeAttribute(writer, "id", component.getClientId());
}
}
}
