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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.WebApplicationException;
28  import javax.ws.rs.core.CacheControl;
29  import javax.ws.rs.core.Context;
30  import javax.ws.rs.core.Response;
31  import javax.ws.rs.core.UriInfo;
32  import javax.ws.rs.core.Response.ResponseBuilder;
33  
34  import org.apache.hadoop.hbase.client.HBaseAdmin;
35  
36  public class ExistsResource extends ResourceBase {
37  
38    static CacheControl cacheControl;
39    static {
40      cacheControl = new CacheControl();
41      cacheControl.setNoCache(true);
42      cacheControl.setNoTransform(false);
43    }
44  
45    String tableName;
46  
47    /**
48     * Constructor
49     * @param table
50     * @throws IOException
51     */
52    public ExistsResource(String table) throws IOException {
53      super();
54      this.tableName = table;
55    }
56  
57    @GET
58    @Produces({MIMETYPE_TEXT, MIMETYPE_XML, MIMETYPE_JSON, MIMETYPE_PROTOBUF,
59      MIMETYPE_BINARY})
60    public Response get(final @Context UriInfo uriInfo) {
61      try {
62        HBaseAdmin admin = new HBaseAdmin(servlet.getConfiguration());
63        if (!admin.tableExists(tableName)) {
64          throw new WebApplicationException(Response.Status.NOT_FOUND);
65        }
66      } catch (IOException e) {
67        throw new WebApplicationException(Response.Status.SERVICE_UNAVAILABLE);
68      }
69      ResponseBuilder response = Response.ok();
70      response.cacheControl(cacheControl);
71      return response.build();
72    }
73  }