package org.jboss.seam.rest.templating.freemarker;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.inject.spi.BeanManager;
import javax.inject.Inject;
import javax.servlet.ServletContext;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import org.jboss.seam.rest.templating.ModelWrapper;
import org.jboss.seam.rest.templating.ResponseTemplate;
import org.jboss.seam.rest.templating.TemplatingModel;
import org.jboss.seam.rest.templating.TemplatingProvider;
import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.Template;
import freemarker.template.TemplateException;
/**
* Converts the response object to a rendered FreeMarker template.
*
* @author <a href="http://community.jboss.org/people/jharting">Jozef Hartinger</a>
*
*/
@ApplicationScoped
public class FreeMarkerProvider implements TemplatingProvider {
private Configuration configuration;
@Inject
private TemplatingModel model;
@Inject
private BeanManager manager;
public void init(ServletContext servletContext) {
configuration = new Configuration();
configuration.setObjectWrapper(new DefaultObjectWrapper());
configuration.setServletContextForTemplateLoading(servletContext, "/");
}
public void writeTo(Object o, ResponseTemplate annotation, Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders, OutputStream os) throws IOException {
Template template = configuration.getTemplate(annotation.value());
model.getData().put(annotation.responseName(), o);
try {
OutputStreamWriter writer = new OutputStreamWriter(os);
template.process(new ModelWrapper(model.getData(), manager), writer);
writer.flush();
} catch (TemplateException e) {
throw new RuntimeException("Unable to write FreeMarker response.", e);
}
}
@Override
public String toString() {
return getClass().getName();
}
}