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Java > Open Source Codes > org > apache > derby > iapi > sql > execute > ExecutionStmtValidator


1 /*
2
3    Derby - Class org.apache.derby.iapi.sql.execute.ExecutionStmtValidator
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.iapi.sql.execute;
23
24 import org.apache.derby.iapi.error.StandardException;
25 import org.apache.derby.iapi.sql.execute.ConstantAction;
26
27 /**
28  * An ExecutionStatementValidator is an object that is
29  * handed a ConstantAction and asked whether it is ok for
30  * this result set to execute. When something like
31  * a trigger is executing, one of these gets pushed.
32  * Before execution, each validator that has been pushed
33  * is invoked on the result set that we are about to
34  * execution. It is up to the validator to look at
35  * the result set and either complain (throw an exception)
36  * or let it through.
37  *
38  * @author jamie
39  */
40 public interface ExecutionStmtValidator
41 {
42     /**
43      * Validate the statement.
44      *
45      * @param constantAction The constant action that we are about to execute.
46      *
47      * @exception StandardException on error
48      *
49      * @see ConstantAction
50      */
51     public void validateStatement(ConstantAction constantAction)
52         throws StandardException;
53 }
54
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