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https://issues.jboss.org/browse/JBSEAM-3988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jozef Hartinger reassigned JBSEAM-3988:
---------------------------------------
Assignee: (was: Jozef Hartinger)
> Support for mapping RESTful XHTML resource representations with Facelets
> templates
> ----------------------------------------------------------------------------------
>
> Key: JBSEAM-3988
> URL: https://issues.jboss.org/browse/JBSEAM-3988
> Project: Seam 2
> Issue Type: Feature Request
> Components: WS
> Reporter: Christian Bauer
> Fix For: The future
>
>
> What I wrote a while ago about this feature:
> I'm thinking about a special provider that can marshal an object graph into
> an XHTML (not just XML) response body and back from an XHTML request body to
> an object graph. This is about the "connectedness" of resources, see the
> O'Reilly REST book. As a developer I should write a Facelets XHTML template
> that defines the transformation. Imagine that you write it the same way you
> write a JSF template today, with bidirectional binding using EL expressions,
> from object getter/setter pair to XML attribute or element value. We can even
> have built-in Facelets "widgets" that render certain microformats. Seam has
> some machinery for this already but we might need an extra interceptor on
> resource methods to trigger the transformation. Or we use Seams pages.xml
> navigation rules ("when this resource method finishes, render this template").
> Later I did some prototype experiments - note that this only considers
> uni-directional mapping for GET, handling POST/PUT resource representation is
> more difficult:
> package org.jboss.seam.resteasy;
> import java.lang.annotation.*;
> /**
> * @author Christian Bauer
> */
> @Target({ElementType.METHOD})
> @Retention(RetentionPolicy.RUNTIME)
> @Documented
> @Inherited
> public @interface FaceletsXhtmlResponse {
> String template();
> }
> package org.jboss.seam.resteasy;
> import org.jboss.seam.core.Interpolator;
> import org.jboss.seam.faces.Renderer;
> import org.jboss.seam.log.Log;
> import org.jboss.seam.log.Logging;
> import javax.ws.rs.ProduceMime;
> import javax.ws.rs.core.MediaType;
> import javax.ws.rs.core.MultivaluedMap;
> import javax.ws.rs.ext.MessageBodyWriter;
> import javax.ws.rs.ext.Provider;
> import java.io.IOException;
> import java.io.OutputStream;
> import java.lang.annotation.Annotation;
> import java.lang.reflect.Type;
> /**
> * @author Christian Bauer
> */
> @Provider
> @ProduceMime("application/xhtml+xml")
> public class FaceletsXhtmlProvider implements MessageBodyWriter<Object> {
> Log log = Logging.getLog(FaceletsXhtmlProvider.class);
> public boolean isWriteable(Class<?> type, Type genericType, Annotation[]
> annotations) {
> for (Annotation annotation : annotations) {
> if
> (annotation.annotationType().equals(FaceletsXhtmlResponse.class)) {
> return true;
> }
> }
> return false;
> }
> public long getSize(Object o) {
> return -1;
> }
> public void writeTo(Object o, Class<?> type, Type genericType,
> Annotation[] annotations,
> MediaType mediaType, MultivaluedMap<String, Object>
> httpHeaders, OutputStream entityStream)
> throws IOException {
> log.debug("writing XHTML response for entity type: " +
> type.getName());
> FaceletsXhtmlResponse respAnnotation = null;
> for (Annotation annotation : annotations) {
> if
> (annotation.annotationType().equals(FaceletsXhtmlResponse.class))
> respAnnotation = (FaceletsXhtmlResponse) annotation;
> }
> if (respAnnotation == null) throw new
> IllegalStateException("@FaceletsXhtmlResponse annotation disappeared");
> String template = getTemplatePath(respAnnotation);
> log.debug("rendering XHTML template: " + template);
> String output = Renderer.instance().render(template);
> entityStream.write(output.getBytes());
> }
> protected String getTemplatePath(FaceletsXhtmlResponse annotation) {
> return isTemplatePathInterpolated()
> ? Interpolator.instance().interpolate(annotation.template())
> : annotation.template();
> }
> protected boolean isTemplatePathInterpolated() {
> return true;
> }
> }
> @Name("customerResource")
> @Path("/customer")
> public class CustomerResource {
> @GET
> @ProduceMime("application/xhtml+xml")
> @FaceletsXhtmlResponse(
> template = "#{somePath}/customerTemplate.xhtml"
> )
> @Out(value = "customers", scope = ScopeType.EVENT)
> public List<Customer> getCustomers() {
> return mockCustomers();
> }
> }
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
> <html xmlns="http://www.w3.org/1999/xhtml";
> xmlns:t="http://java.sun.com/jsf/facelets";
> xmlns:h="http://java.sun.com/jsf/html";
> xmlns:f="http://java.sun.com/jsf/core";>
> <head>
> <title>Customers</title>
> </head>
> <body>
> <ul>
> <t:repeat var="cust" value="#{customers}">
> <li>
> <h:outputText value="#{cust.name}"/>
> </li>
> </t:repeat>
> </ul>
> </body>
> </html>
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