import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.DoAsParam; //导入依赖的package包/类
/**
 * Binding to handle DELETE requests.
 *
 * @param user the principal of the user making the request.
 * @param path the path for operation.
 * @param op the HttpFS operation of the request.
 * @param params the HttpFS parameters of the request.
 *
 * @return the request response.
 *
 * @throws IOException thrown if an IO error occurred. Thrown exceptions are
 * handled by {@link HttpFSExceptionProvider}.
 * @throws FileSystemAccessException thrown if a FileSystemAccess releated
 * error occurred. Thrown exceptions are handled by
 * {@link HttpFSExceptionProvider}.
 */
@DELETE
@Path("{path:.*}")
@Produces(MediaType.APPLICATION_JSON)
public Response delete(@Context Principal user,
                    @PathParam("path") String path,
                    @QueryParam(OperationParam.NAME) OperationParam op,
                    @Context Parameters params)
  throws IOException, FileSystemAccessException {
  Response response;
  path = makeAbsolute(path);
  MDC.put(HttpFSFileSystem.OP_PARAM, op.value().name());
  String doAs = params.get(DoAsParam.NAME, DoAsParam.class);
  switch (op.value()) {
    case DELETE: {
      Boolean recursive =
        params.get(RecursiveParam.NAME,  RecursiveParam.class);
      AUDIT_LOG.info("[{}] recursive [{}]", path, recursive);
      FSOperations.FSDelete command =
        new FSOperations.FSDelete(path, recursive);
      JSONObject json = fsExecute(user, doAs, command);
      response = Response.ok(json).type(MediaType.APPLICATION_JSON).build();
      break;
    }
    default: {
      throw new IOException(
        MessageFormat.format("Invalid HTTP DELETE operation [{0}]",
                             op.value()));
    }
  }
  return response;
}
 

import org.apache.hadoop.fs.http.server.HttpFSParametersProvider.DoAsParam; //导入依赖的package包/类
/**
 * Binding to handle DELETE requests.
 *
 * @param user
 *     the principal of the user making the request.
 * @param path
 *     the path for operation.
 * @param op
 *     the HttpFS operation of the request.
 * @param params
 *     the HttpFS parameters of the request.
 * @return the request response.
 * @throws IOException
 *     thrown if an IO error occurred. Thrown exceptions are
 *     handled by {@link HttpFSExceptionProvider}.
 * @throws FileSystemAccessException
 *     thrown if a FileSystemAccess releated
 *     error occurred. Thrown exceptions are handled by
 *     {@link HttpFSExceptionProvider}.
 */
@DELETE
@Path("{path:.*}")
@Produces(MediaType.APPLICATION_JSON)
public Response delete(
    @Context
    Principal user,
    @PathParam("path")
    String path,
    @QueryParam(OperationParam.NAME)
    OperationParam op,
    @Context
    Parameters params) throws IOException, FileSystemAccessException {
  Response response;
  path = makeAbsolute(path);
  MDC.put(HttpFSFileSystem.OP_PARAM, op.value().name());
  String doAs = params.get(DoAsParam.NAME, DoAsParam.class);
  switch (op.value()) {
    case DELETE: {
      Boolean recursive =
          params.get(RecursiveParam.NAME, RecursiveParam.class);
      AUDIT_LOG.info("[{}] recursive [{}]", path, recursive);
      FSOperations.FSDelete command =
          new FSOperations.FSDelete(path, recursive);
      JSONObject json = fsExecute(user, doAs, command);
      response = Response.ok(json).type(MediaType.APPLICATION_JSON).build();
      break;
    }
    default: {
      throw new IOException(MessageFormat
          .format("Invalid HTTP DELETE operation [{0}]", op.value()));
    }
  }
  return response;
}