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


1 /*
2
3    Derby - Class org.apache.derby.impl.sql.execute.ConstantActionActivation
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
26 import org.apache.derby.iapi.sql.ResultSet;
27
28 import java.util.Vector JavaDoc;
29
30 /**
31     A pre-compiled activation that supports a single ResultSet with
32     a single constant action. All the execution logic is contained
33     in the constant action.
34
35  */
36 public final class ConstantActionActivation extends BaseActivation
37 {
38
39     public int getExecutionCount() { return 0;}
40     public void setExecutionCount(int count) {}
41
42     public Vector JavaDoc getRowCountCheckVector() {return null;}
43     public void setRowCountCheckVector(Vector JavaDoc v) {}
44
45     public int getStalePlanCheckInterval() { return Integer.MAX_VALUE; }
46     public void setStalePlanCheckInterval(int count) {}
47
48     public ResultSet execute() throws StandardException {
49
50         throwIfClosed("execute");
51         startExecution();
52
53         if (resultSet == null)
54             resultSet = getResultSetFactory().getDDLResultSet(this);
55         return resultSet;
56     }
57     public void postConstructor(){}
58 }
59
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