hbase-rest/src/main/java/org/apache/hadoop/hbase/rest/ExistsResource.java

   1 /*
   2  *
   3  * Licensed to the Apache Software Foundation (ASF) under one
   4  * or more contributor license agreements.  See the NOTICE file
   5  * distributed with this work for additional information
   6  * regarding copyright ownership.  The ASF licenses this file
   7  * to you under the Apache License, Version 2.0 (the
   8  * "License"); you may not use this file except in compliance
   9  * with the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19
  20 package org.apache.hadoop.hbase.rest;
  21
  22 import java.io.IOException;
  23
  24 import javax.ws.rs.GET;
  25 import javax.ws.rs.Produces;
  26 import javax.ws.rs.core.CacheControl;
  27 import javax.ws.rs.core.Context;
  28 import javax.ws.rs.core.Response;
  29 import javax.ws.rs.core.UriInfo;
  30 import javax.ws.rs.core.Response.ResponseBuilder;
  31
  32 import org.apache.yetus.audience.InterfaceAudience;
  33
  34 @InterfaceAudience.Private
  35 public class ExistsResource extends ResourceBase {
  36
  37   static CacheControl cacheControl;
  38   static {
  39     cacheControl = new CacheControl();
  40     cacheControl.setNoCache(true);
  41     cacheControl.setNoTransform(false);
  42   }
  43
  44   TableResource tableResource;
  45
  46   /**
  47    * Constructor
  48    * @param tableResource
  49    * @throws IOException
  50    */
  51   public ExistsResource(TableResource tableResource) throws IOException {
  52     super();
  53     this.tableResource = tableResource;
  54   }
  55
  56   @GET
  57   @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
  58     MIMETYPE_PROTOBUF_IETF, MIMETYPE_BINARY})
  59   public Response get(final @Context UriInfo uriInfo) {
  60     try {
  61       if (!tableResource.exists()) {
  62         return Response.status(Response.Status.NOT_FOUND)
  63           .type(MIMETYPE_TEXT).entity("Not found" + CRLF)
  64           .build();
  65       }
  66     } catch (IOException e) {
  67       return Response.status(Response.Status.SERVICE_UNAVAILABLE)
  68         .type(MIMETYPE_TEXT).entity("Unavailable" + CRLF)
  69         .build();
  70     }
  71     ResponseBuilder response = Response.ok();
  72     response.cacheControl(cacheControl);
  73     return response.build();
  74   }
  75 }