001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.lib.wsrs;
020
021import org.apache.hadoop.fs.http.client.HttpFSFileSystem;
022import org.slf4j.Logger;
023import org.slf4j.LoggerFactory;
024
025import javax.ws.rs.core.MediaType;
026import javax.ws.rs.core.Response;
027import javax.ws.rs.ext.ExceptionMapper;
028import java.util.LinkedHashMap;
029import java.util.Map;
030
031public class ExceptionProvider implements ExceptionMapper<Throwable> {
032  private static Logger LOG = LoggerFactory.getLogger(ExceptionProvider.class);
033
034  private static final String ENTER = System.getProperty("line.separator");
035
036  protected Response createResponse(Response.Status status, Throwable throwable) {
037    Map<String, Object> json = new LinkedHashMap<String, Object>();
038    json.put(HttpFSFileSystem.ERROR_MESSAGE_JSON, getOneLineMessage(throwable));
039    json.put(HttpFSFileSystem.ERROR_EXCEPTION_JSON, throwable.getClass().getSimpleName());
040    json.put(HttpFSFileSystem.ERROR_CLASSNAME_JSON, throwable.getClass().getName());
041    Map<String, Object> response = new LinkedHashMap<String, Object>();
042    response.put(HttpFSFileSystem.ERROR_JSON, json);
043    log(status, throwable);
044    return Response.status(status).type(MediaType.APPLICATION_JSON).entity(response).build();
045  }
046
047  protected String getOneLineMessage(Throwable throwable) {
048    String message = throwable.getMessage();
049    if (message != null) {
050      int i = message.indexOf(ENTER);
051      if (i > -1) {
052        message = message.substring(0, i);
053      }
054    }
055    return message;
056  }
057
058  protected void log(Response.Status status, Throwable throwable) {
059    LOG.debug("{}", throwable.getMessage(), throwable);
060  }
061
062  @Override
063  public Response toResponse(Throwable throwable) {
064    return createResponse(Response.Status.BAD_REQUEST, throwable);
065  }
066
067}