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1   /*
2    * Copyright (c) 2011.  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.hbql.statement.args;
22  
23  import org.apache.expreval.expr.node.GenericValue;
24  import org.apache.hadoop.hbase.client.Get;
25  import org.apache.hadoop.hbase.client.Scan;
26  import org.apache.hadoop.hbase.hbql.client.HBqlException;
27  
28  import java.io.IOException;
29  
30  public class VersionArgs extends SelectStatementArgs {
31  
32      public VersionArgs(final GenericValue val) {
33          super(ArgType.VERSION, val);
34      }
35  
36      public int getMaxVersions() throws HBqlException {
37          return ((Number)this.evaluateConstant(0, false)).intValue();
38      }
39  
40      public String asString() {
41          return "VERSIONS " + this.getGenericValue(0).asString();
42      }
43  
44      public void setMaxVersions(final Get get) throws HBqlException {
45          try {
46              final int max = this.getMaxVersions();
47              if (max == Integer.MAX_VALUE)
48                  get.setMaxVersions();
49              else
50                  get.setMaxVersions(max);
51          }
52          catch (IOException e) {
53              throw new HBqlException(e);
54          }
55      }
56  
57      public void setMaxVersions(final Scan scan) throws HBqlException {
58          final int max = this.getMaxVersions();
59          if (max == Integer.MAX_VALUE)
60              scan.setMaxVersions();
61          else
62              scan.setMaxVersions(max);
63      }
64  }