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 java.io.*;
016
017import org.apache.juneau.http.header.*;
018import org.apache.juneau.rest.*;
019
020/**
021 * Response handler for {@link Throwable} objects.
022 *
023 * <p>
024 * Adds a <c>Thrown</c> header to the response and returns <c>0</c> so that the processor chain can continue.
025 *
026 * <h5 class='section'>See Also:</h5><ul>
027 *    <li class='link'><a class="doclink" href="../../../../../index.html#jrs.ResponseProcessors">Response Processors</a>
028 * </ul>
029 */
030public final class ThrowableProcessor implements ResponseProcessor {
031
032   @Override /* ResponseProcessor */
033   public int process(RestOpSession opSession) throws IOException {
034
035      RestResponse res = opSession.getResponse();
036      Throwable t = res.getContent(Throwable.class);
037
038      if (t == null)
039         return NEXT;
040
041      res.addHeader(Thrown.of(t));
042
043      return NEXT; // Continue processing as bean.
044   }
045}
046