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.processor;
014
015import static org.apache.juneau.common.internal.StringUtils.*;
016
017import java.io.*;
018
019import org.apache.juneau.rest.*;
020import org.apache.juneau.rest.util.*;
021import org.apache.juneau.http.header.*;
022import org.apache.juneau.http.response.*;
023
024/**
025 * Response handler for plain-old Java objects when a serializer match is not found and they're asking for plain/text or anything.
026 *
027 * <h5 class='section'>See Also:</h5><ul>
028 *    <li class='link'><a class="doclink" href="../../../../../index.html#jrs.ResponseProcessors">Response Processors</a>
029 * </ul>
030 */
031public final class PlainTextPojoProcessor implements ResponseProcessor {
032
033   @Override /* ResponseProcessor */
034   public int process(RestOpSession opSession) throws IOException, NotAcceptable, BasicHttpException {
035      RestRequest req = opSession.getRequest();
036      RestResponse res = opSession.getResponse();
037      String accept = req.getHeaderParam("Accept").orElse("*/*");
038
039      if (res.getSerializerMatch().isPresent() || ! (isEmpty(accept) || accept.startsWith("text/plain") || accept.contains("*/*")))
040         return NEXT;
041
042      Object o = res.getContent(Object.class);
043
044      if (isEmpty(res.getContentType()))
045         res.setHeader(ContentType.TEXT_PLAIN);
046
047      FinishablePrintWriter w = res.getNegotiatedWriter();
048      if (o == null)
049         w.append("null");
050      else
051         w.append(req.getBeanSession().getClassMetaForObject(o).toString(o));
052      w.flush();
053      w.finish();
054
055      return FINISHED;
056   }
057}
058