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/*
* 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("-")) {
if (excludedFields == null) {
excludedFields = new HashSet<String>();
metadata.put(EXCLUDED_FIELDS, excludedFields);
}
excludedFields.add(f.substring(1));
} else {
if (includedFields == null) {
includedFields = new HashSet<String>();
metadata.put(INCLUDED_FIELDS, includedFields);
}
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;
}
}
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