| /** |
| * |
| * Copyright 2009-2011 Rickard Öberg AB |
| * |
| * 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 |
| * |
| * http://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.apache.zest.library.rest.server.restlet.responsewriter; |
| |
| import freemarker.template.Configuration; |
| import freemarker.template.Template; |
| import freemarker.template.TemplateException; |
| import java.io.IOException; |
| import java.io.Writer; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import org.apache.zest.api.injection.scope.Service; |
| import org.apache.zest.api.value.ValueDescriptor; |
| import org.restlet.Response; |
| import org.restlet.data.MediaType; |
| import org.restlet.representation.Representation; |
| import org.restlet.representation.WriterRepresentation; |
| import org.restlet.resource.ResourceException; |
| import org.restlet.service.MetadataService; |
| |
| /** |
| * JAVADOC |
| */ |
| public class ResourceTemplateResponseWriter extends AbstractResponseWriter |
| { |
| private static final List<MediaType> supportedMediaTypes = Arrays.asList( MediaType.TEXT_HTML, MediaType.APPLICATION_ATOM ); |
| |
| @Service |
| private Configuration cfg; |
| |
| @Service |
| private MetadataService metadataService; |
| |
| Set<String> skip = new HashSet<String>(); |
| |
| @Override |
| public boolean writeResponse( final Object result, final Response response ) |
| throws ResourceException |
| { |
| MediaType type = getVariant( response.getRequest(), ENGLISH, supportedMediaTypes ).getMediaType(); |
| if( type != null ) |
| { |
| // Try to find template for this specific resource |
| StringBuilder templateBuilder = (StringBuilder) response.getRequest().getAttributes().get( "template" ); |
| String templateName = templateBuilder.toString(); |
| |
| if( result instanceof ValueDescriptor ) |
| { |
| templateName += "_form"; |
| } |
| |
| final String extension = metadataService.getExtension( type ); |
| templateName += "." + extension; |
| |
| // Have we failed on this one before, then don't try again |
| if( skip.contains( templateName ) ) |
| { |
| return false; |
| } |
| |
| try |
| { |
| final Template template = cfg.getTemplate( templateName ); |
| Representation rep = new WriterRepresentation( MediaType.TEXT_HTML ) |
| { |
| @Override |
| public void write( Writer writer ) |
| throws IOException |
| { |
| Map<String, Object> context = new HashMap<String, Object>(); |
| context.put( "request", response.getRequest() ); |
| context.put( "response", response ); |
| |
| context.put( "result", result ); |
| |
| try |
| { |
| template.process( context, writer ); |
| } |
| catch( TemplateException e ) |
| { |
| throw new IOException( e ); |
| } |
| } |
| }; |
| response.setEntity( rep ); |
| return true; |
| } |
| catch( Exception e ) |
| { |
| skip.add( templateName ); |
| // Ignore |
| } |
| } |
| return false; |
| } |
| } |