01: /*
02:
03: Derby - Class org.apache.derby.impl.sql.execute.ConstantActionActivation
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (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;
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: public int getExecutionCount() {
39: return 0;
40: }
41:
42: public void setExecutionCount(int count) {
43: }
44:
45: public Vector getRowCountCheckVector() {
46: return null;
47: }
48:
49: public void setRowCountCheckVector(Vector v) {
50: }
51:
52: public int getStalePlanCheckInterval() {
53: return Integer.MAX_VALUE;
54: }
55:
56: public void setStalePlanCheckInterval(int count) {
57: }
58:
59: public ResultSet execute() throws StandardException {
60:
61: throwIfClosed("execute");
62: startExecution();
63:
64: if (resultSet == null)
65: resultSet = getResultSetFactory().getDDLResultSet(this );
66: return resultSet;
67: }
68:
69: public void postConstructor() {
70: }
71: }
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