001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.rest.processor;
018
019import java.io.*;
020
021import org.apache.juneau.common.utils.*;
022import org.apache.juneau.http.header.*;
023import org.apache.juneau.http.response.*;
024import org.apache.juneau.rest.*;
025import org.apache.juneau.rest.util.*;
026
027/**
028 * Response handler for plain-old Java objects when a serializer match is not found and they're asking for plain/text or anything.
029 *
030 * <h5 class='section'>See Also:</h5><ul>
031 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/ResponseProcessors">Response Processors</a>
032 * </ul>
033 */
034public class PlainTextPojoProcessor implements ResponseProcessor {
035
036   @Override /* ResponseProcessor */
037   public int process(RestOpSession opSession) throws IOException, NotAcceptable, BasicHttpException {
038      RestRequest req = opSession.getRequest();
039      RestResponse res = opSession.getResponse();
040      String accept = req.getHeaderParam("Accept").orElse("*/*");
041
042      if (res.getSerializerMatch().isPresent() || ! (Utils.isEmpty(accept) || accept.startsWith("text/plain") || accept.contains("*/*")))
043         return NEXT;
044
045      Object o = res.getContent(Object.class);
046
047      if (Utils.isEmpty(res.getContentType()))
048         res.setHeader(ContentType.TEXT_PLAIN);
049
050      FinishablePrintWriter w = res.getNegotiatedWriter();
051      if (o == null)
052         w.append("null");
053      else
054         w.append(req.getBeanSession().getClassMetaForObject(o).toString(o));
055      w.flush();
056      w.finish();
057
058      return FINISHED;
059   }
060}
061