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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 TimestampArgs extends SelectStatementArgs {
31  
32      final boolean aSingleValue;
33  
34      public TimestampArgs(final GenericValue arg0) {
35          super(ArgType.TIMESTAMPRANGE, arg0, arg0);
36          this.aSingleValue = true;
37      }
38  
39      public TimestampArgs(final GenericValue arg0, final GenericValue arg1) {
40          super(ArgType.TIMESTAMPRANGE, arg0, arg1);
41          this.aSingleValue = false;
42      }
43  
44      private long getLower() throws HBqlException {
45          return (Long)this.evaluateConstant(0, false);
46      }
47  
48      private long getUpper() throws HBqlException {
49          return (Long)this.evaluateConstant(1, false);
50      }
51  
52      private boolean isASingleValue() {
53          return this.aSingleValue;
54      }
55  
56      public String asString() {
57          if (this.isASingleValue())
58              return "TIMESTAMP " + this.getGenericValue(0).asString();
59          else
60              return "TIMESTAMP RANGE " + this.getGenericValue(0).asString() + " TO "
61                     + this.getGenericValue(1).asString();
62      }
63  
64      public void setTimeStamp(final Get get) throws HBqlException {
65          try {
66              if (this.isASingleValue())
67                  get.setTimeStamp(this.getLower());
68              else
69                  get.setTimeRange(this.getLower(), this.getUpper());
70          }
71          catch (IOException e) {
72              throw new HBqlException(e);
73          }
74      }
75  
76      public void setTimeStamp(final Scan scan) throws HBqlException {
77          try {
78              if (this.isASingleValue())
79                  scan.setTimeStamp(this.getLower());
80              else
81                  scan.setTimeRange(this.getLower(), this.getUpper());
82          }
83          catch (IOException e) {
84              throw new HBqlException(e);
85          }
86      }
87  }