| /** |
| * |
| * 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; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.ResourceBundle; |
| import org.apache.zest.api.injection.scope.Service; |
| import org.apache.zest.api.injection.scope.Structure; |
| import org.apache.zest.api.mixin.InitializationException; |
| import org.apache.zest.api.service.ServiceReference; |
| import org.apache.zest.api.structure.Module; |
| import org.apache.zest.library.rest.server.spi.ResponseWriter; |
| import org.restlet.Response; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Delegates to a list of potential writers. Register writers on startup. |
| */ |
| public class ResponseWriterDelegator |
| implements ResponseWriter |
| { |
| List<ResponseWriter> responseWriters = new ArrayList<ResponseWriter>(); |
| |
| @Structure |
| Module module; |
| |
| public void init( @Service Iterable<ServiceReference<ResponseWriter>> resultWriters ) |
| throws InitializationException |
| { |
| Logger logger = LoggerFactory.getLogger( getClass() ); |
| |
| // Add custom writers first |
| for( ServiceReference<ResponseWriter> resultWriter : resultWriters ) |
| { |
| if( !resultWriter.identity().equals( "responsewriterdelegator" ) ) |
| { |
| logger.info( "Registered result writer:" + resultWriter.identity() ); |
| registerResultWriter( resultWriter.get() ); |
| } |
| } |
| |
| // Add defaults |
| ResourceBundle defaultResultWriters = ResourceBundle.getBundle( "org.qi4j.library.rest.server.rest-server" ); |
| |
| String resultWriterClasses = defaultResultWriters.getString( "responsewriters" ); |
| logger.info( "Using response writers:" + resultWriterClasses ); |
| for( String className : resultWriterClasses.split( "," ) ) |
| { |
| try |
| { |
| Class writerClass = module.classLoader().loadClass( className.trim() ); |
| ResponseWriter writer = (ResponseWriter) module.newObject( writerClass ); |
| registerResultWriter( writer ); |
| } |
| catch( ClassNotFoundException e ) |
| { |
| logger.warn( "Could not register response writer " + className, e ); |
| } |
| } |
| } |
| |
| public void registerResultWriter( ResponseWriter writer ) |
| { |
| responseWriters.add( writer ); |
| } |
| |
| @Override |
| public boolean writeResponse( Object result, Response response ) |
| { |
| for( ResponseWriter responseWriter : responseWriters ) |
| { |
| if( responseWriter.writeResponse( result, response ) ) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| } |