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.server.processor;
018
019import java.io.*;
020
021import org.apache.juneau.http.header.*;
022import org.apache.juneau.http.response.*;
023import org.apache.juneau.rest.server.*;
024
025/**
026 * Response handler for {@link HttpResponseMessage} objects (transport-neutral replacement for {@code HttpResponse}).
027 *
028 * <h5 class='section'>See Also:</h5><ul>
029 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/ResponseProcessors">Response Processors</a>
030 * </ul>
031 */
032public class HttpResponseProcessor implements ResponseProcessor {
033
034   @Override /* Overridden from ResponseProcessor */
035   public int process(RestOpSession opSession) throws IOException {
036
037      var res = opSession.getResponse();
038      var r = res.getContent(HttpResponseMessage.class);
039
040      if (r == null) {
041         var raw = res.getContent(Object.class);
042         if (LegacyHttpResponseAdapter.isLegacyResponse(raw))
043            r = LegacyHttpResponseAdapter.adapt(raw);
044         else
045            return NEXT;
046      }
047
048      opSession.status(r.getStatusLine());
049
050      var body = r.getBody();
051      if (body != null) {
052         var ct = body.getContentType();
053         if (ct != null)
054            res.setHeader(ContentType.of(ct));
055         var contentLength = body.getContentLength();
056         if (contentLength >= 0)
057            res.setHeader(ContentLength.of(contentLength));
058      }
059
060      r.getHeaders().forEach(res::addHeader);
061
062      if (body != null) {
063         try (var os = res.getNegotiatedOutputStream()) {
064            body.writeTo(os);
065            os.flush();
066         }
067      }
068
069      return FINISHED;
070   }
071}