| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.tuscany.sca.binding.rest.provider; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Type; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import javax.ws.rs.Produces; |
| import javax.ws.rs.WebApplicationException; |
| 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 org.apache.tuscany.sca.common.http.HTTPContext; |
| import org.apache.tuscany.sca.common.http.ThreadHTTPContext; |
| import org.apache.tuscany.sca.core.ExtensionPointRegistry; |
| import org.apache.tuscany.sca.interfacedef.DataType; |
| import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl; |
| |
| /** |
| * The generic JAX-RS message body writer based on Tuscany's databindingframework |
| */ |
| @Provider |
| @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML, MediaType.TEXT_XML, MediaType.WILDCARD}) |
| public class DataBindingJAXRSWriter<T> extends DataBindingJAXRSProvider implements MessageBodyWriter<T> { |
| |
| public static final String FIELDS = "fields"; |
| public static final String EXCLUDED_FIELDS = "excludedFields"; |
| public static final String INCLUDED_FIELDS = "includedFields"; |
| |
| public DataBindingJAXRSWriter(ExtensionPointRegistry registry) { |
| super(registry); |
| } |
| |
| public long getSize(T t, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { |
| return -1; |
| } |
| |
| public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) { |
| // DataType dataType = createDataType(type, genericType); |
| return supports(type, genericType, annotations, mediaType); |
| } |
| |
| public void writeTo(T t, |
| Class<?> type, |
| Type genericType, |
| Annotation[] annotations, |
| MediaType mediaType, |
| MultivaluedMap<String, Object> httpHeaders, |
| OutputStream entityStream) throws IOException, WebApplicationException { |
| DataType dataType = createDataType(type, genericType); |
| mediaType = new MediaType(mediaType.getType(), mediaType.getSubtype()); |
| String dataBinding = OutputStream.class.getName(); |
| // FIXME: [rfeng] This is a hack to handle application/json |
| if (MediaType.APPLICATION_JSON_TYPE.equals(mediaType)) { |
| dataBinding = mediaType.toString() + "#" + OutputStream.class.getName(); |
| } else if (MediaType.APPLICATION_XML_TYPE.equals(mediaType) || MediaType.TEXT_XML_TYPE.equals(mediaType)) { |
| dataBinding = OutputStream.class.getName(); |
| } else if ("application/x-protobuf".equals(mediaType.toString())) { |
| dataBinding = mediaType.toString() + "#" + OutputStream.class.getName(); |
| } else { |
| dataBinding = dataType.getDataBinding(); |
| write(entityStream, t, type); |
| return; |
| } |
| DataType targetDataType = |
| new DataTypeImpl(dataBinding, OutputStream.class, OutputStream.class, OutputStream.class); |
| // dataBindingExtensionPoint.introspectType(targetDataType, null); |
| |
| introspectAnnotations(annotations, targetDataType); |
| |
| Map<String, Object> metadata = getFields(); |
| mediator.mediate(t, entityStream, dataType, targetDataType, metadata); |
| } |
| |
| private Map<String, Object> getFields() { |
| Map<String, Object> metadata = Collections.<String, Object> emptyMap(); |
| HTTPContext context = ThreadHTTPContext.getHTTPContext(); |
| if (context != null) { |
| metadata = new HashMap<String, Object>(); |
| String included = context.getHttpRequest().getParameter(INCLUDED_FIELDS); |
| String excluded = context.getHttpRequest().getParameter(EXCLUDED_FIELDS); |
| Set<String> includedFields = tokenize(included); |
| if (includedFields != null) { |
| metadata.put(INCLUDED_FIELDS, includedFields); |
| } |
| Set<String> excludedFields = tokenize(excluded); |
| if (excludedFields != null) { |
| metadata.put(EXCLUDED_FIELDS, excludedFields); |
| } |
| |
| // The syntax is fields=f1,f2,-f3 |
| String fields = (String)context.getHttpRequest().getParameter(FIELDS); |
| if (fields != null) { |
| Set<String> fieldSet = tokenize(fields); |
| for (String f : fieldSet) { |
| if (f.startsWith("-")) { |
| excludedFields.add(f.substring(1)); |
| } else { |
| includedFields.add(f); |
| } |
| } |
| } |
| |
| } |
| return metadata; |
| } |
| |
| private Set<String> tokenize(String included) { |
| if (included == null) { |
| return null; |
| } |
| String[] fields = included.split("(,| )+"); |
| Set<String> includedFields = new HashSet<String>(); |
| for (String f : fields) { |
| String field = f.trim(); |
| if (field.length() > 0) { |
| includedFields.add(field); |
| } |
| } |
| return includedFields; |
| } |
| |
| } |