/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.faces.render;
import javax.faces.component.UIComponent;
import javax.faces.context.ResponseWriter;
import javax.faces.context.ResponseStream;
import java.io.Writer;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.Collections;
import java.util.Set;
/**
* <p><span
* class="changed_modified_2_0"><strong>RenderKit</strong></span>
* represents a collection of {@link Renderer} instances that, together,
* know how to render JavaServer Faces {@link UIComponent} instances for
* a specific client. Typically, {@link RenderKit}s are specialized for
* some combination of client device type, markup language, and/or user
* <code>Locale</code>. A {@link RenderKit} also acts as a Factory for
* associated {@link Renderer} instances, which perform the actual
* rendering process for each component.</p>
*
* <p>A typical JavaServer Faces implementation will configure one or
* more {@link RenderKit} instances at web application startup. They
* are made available through calls to the <code>getRenderKit()</code>
* methods of {@link RenderKitFactory}. Because {@link RenderKit}
* instances are shared, they must be implemented in a thread-safe
* manner. Due to limitations in the current specification having
* multiple <code>RenderKit</code> instances at play in the same
* application requires a custom {@link
* javax.faces.application.ViewHandler} instance that is aware of how to
* deal with this case. This limitation will be lifted in a future
* version of the spec.</p>
*
* <p>The <code>RenderKit</code> instance must also vend a {@link
* ResponseStateManager} instance, which is used in the process of
* saving and restoring tree structure and state.</p>
*/
public abstract class RenderKit {
/**
* <p>Register the specified {@link Renderer} instance, associated with the
* specified component <code>family</code> and <code>rendererType</code>,
* to the set of {@link Renderer}s registered with this {@link RenderKit},
* replacing any previously registered {@link Renderer} for this
* combination of identifiers.</p>
*
* @param family Component family of the {@link Renderer} to register
* @param rendererType Renderer type of the {@link Renderer} to register
* @param renderer {@link Renderer} instance we are registering
*
* @throws NullPointerException if <code>family</code> or
* <code>rendererType</code> or <code>renderer</code> is null
*/
public abstract void addRenderer(String family, String rendererType,
Renderer renderer);
/**
* <p>Return the {@link Renderer} instance most recently registered for
* the specified component <code>family</code> and
* <code>rendererType</code>, if any; otherwise, return
* <code>null</code>.</p>
*
* @param family Component family of the requested
* {@link Renderer} instance
* @param rendererType Renderer type of the requested
* {@link Renderer} instance
*
* @throws NullPointerException if <code>family</code> or
* <code>rendererType</code> is <code>null</code>
*
* @return the {@link Renderer} instance
*/
public abstract Renderer getRenderer(String family, String rendererType);
/**
* <p>Return an instance of {@link ResponseStateManager} to handle
* rendering technology specific state management decisions.</p>
*
* @return the {@link ResponseStateManager}
*/
public abstract ResponseStateManager getResponseStateManager();
/**
* <p>Use the provided <code>Writer</code> to create a new {@link
* ResponseWriter} instance for the specified (optional) content
* type, and character encoding.</p>
*
* <p>Implementors are advised to consult the
* <code>getCharacterEncoding()</code> method of class {@link
* javax.servlet.ServletResponse} to get the required value for the
* characterEncoding for this method. Since the <code>Writer</code>
* for this response will already have been obtained (due to it
* ultimately being passed to this method), we know that the
* character encoding cannot change during the rendering of the
* response.</p>
*
* @param writer the Writer around which this {@link ResponseWriter}
* must be built.
*
* @param contentTypeList an "Accept header style" list of content
* types for this response, or <code>null</code> if the RenderKit
* should choose the best fit. As of the current version, the
* values accepted by the Standard render-kit for this parameter
* include any valid "Accept header style" String that includes the
* String <code>text/html</code>,
* <code>application/xhtml+xml</code>, <code>application/xml</code>
* or <code>text/xml</code>. This may change in a future version.
* The RenderKit must support a value for this argument that comes
* straight from the <code>Accept</code> HTTP header, and therefore
* requires parsing according to the specification of the
* <code>Accept</code> header. Please see <a
* href="http://www.ietf.org/rfc/rfc2616.txt?number=2616">Section
* 14.1 of RFC 2616</a> for the specification of the
* <code>Accept</code> header.
*
* @param characterEncoding such as "ISO-8859-1" for this
* ResponseWriter, or <code>null</code> if the
* <code>RenderKit</code> should choose the best fit. Please see <a
* href="http://www.iana.org/assignments/character-sets">the
* IANA</a> for a list of character encodings.
*
* @return a new {@link ResponseWriter}.
*
* @throws IllegalArgumentException if no matching content type
* can be found in <code>contentTypeList</code>, no appropriate
* content type can be found with the implementation dependent best
* fit algorithm, or no matching character encoding can be found for
* the argument <code>characterEncoding</code>.
*
*/
public abstract ResponseWriter createResponseWriter(Writer writer,
String contentTypeList,
String characterEncoding);
/**
* <p>Use the provided <code>OutputStream</code> to create a new
* {@link ResponseStream} instance.</p>
*
* @param out the {@code OutputStream} around which to create the
* {@link ResponseStream}
*
* @return the new {@link ResponseStream}
*
*/
public abstract ResponseStream createResponseStream(OutputStream out);
/**
* <p class="changed_added_2_0">Return an <code>Iterator</code> over
* the component-family entries supported by this
* <code>RenderKit</code> instance.</p>
*
* <p class="changed_added_2_0">
* The default implementation of this method returns an empty
* <code>Iterator</code>
* </p>
*
* @since 2.0
*
* @return Return an <code>Iterator</code> over
* the component-family entries
*
*/
public Iterator<String> getComponentFamilies() {
Set<String> empty = Collections.emptySet();
return empty.iterator();
}
/**
* <p class="changed_added_2_0">Return an <code>Iterator</code> over
* the renderer-type entries for the given component-family.</p>
*
* <p class="changed_added_2_0">If the specified <code>componentFamily</code>
* is not known to this <code>RenderKit</code> implementation, return
* an empty <code>Iterator</code></p>
*
* <p class="changed_added_2_0">
* The default implementation of this method returns an empty
* <code>Iterator</code>
* </p>
*
* @param componentFamily one of the members of the
* <code>Iterator</code> returned by {@link #getComponentFamilies}.
*
* @since 2.0
*
* @return an <code>Iterator</code> over the renderer-type
*
*/
public Iterator<String> getRendererTypes(String componentFamily) {
Set<String> empty = Collections.emptySet();
return empty.iterator();
}
/**
* <p>Register the specified {@link ClientBehaviorRenderer} instance,
* associated with the specified component <code>type</code>,
* to the set of {@link ClientBehaviorRenderer}s registered with this
* {@link RenderKit}, replacing any previously registered
* {@link ClientBehaviorRenderer} for this type.</p>
*
* @param type type of the {@link ClientBehaviorRenderer} to register
* @param renderer {@link ClientBehaviorRenderer} instance we are registering
*
* @throws NullPointerException if <code>type</code> or
* <code>renderer</code> is null
*
* @since 2.0
*/
public void addClientBehaviorRenderer(String type, ClientBehaviorRenderer renderer) {
throw new UnsupportedOperationException("The default implementation must override this method");
}
/**
* <p>Return the {@link ClientBehaviorRenderer} instance most recently
* registered for the specified <code>type</code>, if any;
* otherwise, return <code>null</code>.</p>
*
* @param type type of the requested
* {@link ClientBehaviorRenderer} instance
*
* @throws NullPointerException if <code>type</code>
* is <code>null</code>
*
* @since 2.0
*
* @return the {@link ClientBehaviorRenderer} instance
*/
public ClientBehaviorRenderer getClientBehaviorRenderer(String type) {
throw new UnsupportedOperationException("The default implementation must override this method");
}
/**
* <p class="changed_added_2_0">Return an <code>Iterator</code> over
* the {@link ClientBehaviorRenderer} types.</p>
*
* @since 2.0
*
* @return an <code>Iterator</code> over
* the {@link ClientBehaviorRenderer}
*/
public Iterator<String> getClientBehaviorRendererTypes() {
throw new UnsupportedOperationException("The default implementation must override this method");
}
}