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1   /*
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.rest;
22  
23  import java.io.IOException;
24  
25  import javax.ws.rs.GET;
26  import javax.ws.rs.Produces;
27  import javax.ws.rs.core.CacheControl;
28  import javax.ws.rs.core.Context;
29  import javax.ws.rs.core.Response;
30  import javax.ws.rs.core.UriInfo;
31  import javax.ws.rs.core.Response.ResponseBuilder;
32  
33  public class ExistsResource extends ResourceBase {
34  
35    static CacheControl cacheControl;
36    static {
37      cacheControl = new CacheControl();
38      cacheControl.setNoCache(true);
39      cacheControl.setNoTransform(false);
40    }
41  
42    TableResource tableResource;
43  
44    /**
45     * Constructor
46     * @param tableResource
47     * @throws IOException
48     */
49    public ExistsResource(TableResource tableResource) throws IOException {
50      super();
51      this.tableResource = tableResource;
52    }
53  
54    @GET
55    @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
56      MIMETYPE_PROTOBUF_IETF, MIMETYPE_BINARY})
57    public Response get(final @Context UriInfo uriInfo) {
58      try {
59        if (!tableResource.exists()) {
60          return Response.status(Response.Status.NOT_FOUND)
61            .type(MIMETYPE_TEXT).entity("Not found" + CRLF)
62            .build();
63        }
64      } catch (IOException e) {
65        return Response.status(Response.Status.SERVICE_UNAVAILABLE)
66          .type(MIMETYPE_TEXT).entity("Unavailable" + CRLF)
67          .build();
68      }
69      ResponseBuilder response = Response.ok();
70      response.cacheControl(cacheControl);
71      return response.build();
72    }
73  }