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Java > Open Source Codes > org > apache > derby > impl > sql > execute > MiscResultSet


1 /*
2
3    Derby - Class org.apache.derby.impl.sql.execute.MiscResultSet
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    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
22 package org.apache.derby.impl.sql.execute;
23
24 import org.apache.derby.iapi.error.StandardException;
25 import org.apache.derby.iapi.sql.execute.ConstantAction;
26 import org.apache.derby.iapi.sql.Activation;
27
28
29 /**
30  * This is a wrapper class which invokes the Execution-time logic for
31  * Misc statements. The real Execution-time logic lives inside the
32  * executeConstantAction() method of the Execution constant.
33  *
34  * @author jamie
35  */
36
37 class MiscResultSet extends NoRowsResultSetImpl
38 {
39     private final ConstantAction constantAction;
40
41     /**
42      * Construct a MiscResultSet
43      *
44      * @param activation Describes run-time environment.
45      *
46      * @exception StandardException Standard Cloudscape error policy.
47      */
48     MiscResultSet(Activation activation)
49          throws StandardException
50     {
51         super(activation);
52         constantAction = activation.getConstantAction();
53     }
54     
55     public void open() throws StandardException
56     {
57         constantAction.executeConstantAction(activation);
58         super.close();
59     }
60
61     /**
62      * @see org.apache.derby.iapi.sql.ResultSet#cleanUp
63      */
64     public void cleanUp()
65     {
66     }
67 }
68
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