Source code

001// ***************************************************************************************************************************
002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
003// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
005// * with the License.  You may obtain a copy of the License at                                                              *
006// *                                                                                                                         *
007// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
008// *                                                                                                                         *
009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an  *
010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the        *
011// * specific language governing permissions and limitations under the License.                                              *
012// ***************************************************************************************************************************
013package org.apache.juneau.rest.reshandlers;
014
015import static org.apache.juneau.internal.ObjectUtils.*;
016import static org.apache.juneau.internal.StringUtils.*;
017import static org.apache.juneau.httppart.HttpPartType.*;
018
019import java.io.*;
020import java.lang.reflect.*;
021import java.util.*;
022
023import org.apache.juneau.http.*;
024import org.apache.juneau.httppart.*;
025import org.apache.juneau.httppart.bean.*;
026import org.apache.juneau.internal.*;
027import org.apache.juneau.rest.*;
028import org.apache.juneau.rest.exception.*;
029import org.apache.juneau.rest.util.*;
030import org.apache.juneau.serializer.*;
031
032/**
033 * Response handler for POJOs not handled by other handlers.
034 *
035 * <p>
036 * This uses the serializers defined on the response to serialize the POJO.
037 *
038 * <p>
039 * The {@link Serializer} used is based on the <code>Accept</code> header on the request.
040 *
041 * <p>
042 * The <code>Content-Type</code> header is set to the mime-type defined on the selected serializer based on the
043 * <code>produces</code> value passed in through the constructor.
044 *
045 * <h5 class='section'>See Also:</h5>
046 * <ul>
047 *    <li class='link'>{@doc juneau-rest-server.RestMethod.MethodReturnTypes}
048 * </ul>
049 */
050public class DefaultHandler implements ResponseHandler {
051
052   @SuppressWarnings("resource")
053   @Override /* ResponseHandler */
054   public boolean handle(RestRequest req, RestResponse res) throws IOException, InternalServerError, NotAcceptable {
055      SerializerGroup g = res.getSerializers();
056      String accept = req.getHeaders().getString("Accept", "");
057      SerializerMatch sm = g.getSerializerMatch(accept);
058      HttpPartSchema schema = null;
059
060      Object o = res.getOutput();
061
062      ResponseBeanMeta rm = res.getResponseMeta();
063      if (rm == null)
064         rm = req.getResponseBeanMeta(o);
065
066      if (rm != null) {
067
068         ResponseBeanPropertyMeta stm = rm.getStatusMethod();
069         if (stm != null) {
070            try {
071               res.setStatus((int)stm.getGetter().invoke(o));
072            } catch (Exception e) {
073               throw new InternalServerError(e, "Could not get status.");
074            }
075         } else if (rm.getCode() != 0) {
076            res.setStatus(rm.getCode());
077         }
078
079         for (ResponseBeanPropertyMeta hm : rm.getHeaderMethods()) {
080            try {
081               Object ho = hm.getGetter().invoke(o);
082               String n = hm.getPartName();
083               if ("*".equals(n) && ho instanceof Map) {
084                  @SuppressWarnings("rawtypes") Map m = (Map)ho;
085                  for (Object key : m.keySet()) {
086                     String k = asString(key);
087                     Object v = m.get(key);
088                     HttpPartSchema s = hm.getSchema().getProperty(k);
089                     res.setHeader(new HttpPart(k, RESPONSE_HEADER, s, hm.getSerializer(req.getPartSerializer()), req.getSerializerSessionArgs(), v));
090                  }
091               } else {
092                  res.setHeader(new HttpPart(n, RESPONSE_HEADER, hm.getSchema(), hm.getSerializer(req.getPartSerializer()), req.getSerializerSessionArgs(), ho));
093               }
094            } catch (Exception e) {
095               throw new InternalServerError(e, "Could not set header ''{0}''", hm.getPartName());
096            }
097         }
098
099         ResponseBeanPropertyMeta bm = rm.getBodyMethod();
100
101         if (bm != null) {
102            Method m = bm.getGetter();
103            try {
104               Class<?>[] pt = m.getParameterTypes();
105               if (pt.length == 1) {
106                  Class<?> ptt = pt[0];
107                  if (ptt == OutputStream.class)
108                     m.invoke(o, res.getOutputStream());
109                  else if (ptt == Writer.class)
110                     m.invoke(o, res.getWriter());
111                  return true;
112               }
113               o = m.invoke(o);
114            } catch (Exception e) {
115               throw new InternalServerError(e, "Could not get body.");
116            }
117         }
118
119         schema = rm.getSchema();
120      }
121
122      if (sm != null) {
123         Serializer s = sm.getSerializer();
124         MediaType mediaType = res.getMediaType();
125         if (mediaType == null)
126            mediaType = sm.getMediaType();
127
128         MediaType responseType = s.getResponseContentType();
129         if (responseType == null)
130            responseType = mediaType;
131
132         res.setContentType(responseType.toString());
133
134         try {
135            RequestProperties p = res.getProperties();
136            if (req.isPlainText())
137               res.setContentType("text/plain");
138            p.append("mediaType", mediaType).append("characterEncoding", res.getCharacterEncoding());
139
140            SerializerSession session = s.createSession(new SerializerSessionArgs(p, req.getJavaMethod(), req.getLocale(), req.getHeaders().getTimeZone(), mediaType, schema, req.isDebug() ? true : null, req.getUriContext(), req.isPlainText() ? true : null));
141
142            for (Map.Entry<String,String> h : session.getResponseHeaders().entrySet())
143               res.setHeader(h.getKey(), h.getValue());
144
145            if (! session.isWriterSerializer()) {
146               if (req.isPlainText()) {
147                  FinishablePrintWriter w = res.getNegotiatedWriter();
148                  ByteArrayOutputStream baos = new ByteArrayOutputStream();
149                  session.serialize(o, baos);
150                  w.write(StringUtils.toSpacedHex(baos.toByteArray()));
151                  w.flush();
152                  w.finish();
153               } else {
154                  FinishableServletOutputStream os = res.getNegotiatedOutputStream();
155                  session.serialize(o, os);
156                  os.flush();
157                  os.finish();
158               }
159            } else {
160               FinishablePrintWriter w = res.getNegotiatedWriter();
161               session.serialize(o, w);
162               w.flush();
163               w.finish();
164            }
165         } catch (SerializeException e) {
166            throw new InternalServerError(e);
167         }
168         return true;
169      }
170
171      // Non-existent Accept or plain/text can just be serialized as-is.
172      if (o != null && (isEmpty(accept) || accept.startsWith("text/plain"))) {
173         String out = null;
174         if (isEmpty(res.getContentType()))
175            res.setContentType("text/plain");
176         out = req.getBeanSession().getClassMetaForObject(o).toString(o);
177         FinishablePrintWriter w = res.getNegotiatedWriter();
178         w.append(out);
179         w.flush();
180         w.finish();
181         return true;
182      }
183
184      throw new NotAcceptable(
185         "Unsupported media-type in request header ''Accept'': ''{0}''\n\tSupported media-types: {1}",
186         req.getHeaders().getString("Accept", ""), g.getSupportedMediaTypes()
187      );
188   }
189}