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Java > Open Source Codes > org > apache > derby > catalog > ReferencedColumns


1 /*
2
3    Derby - Class org.apache.derby.catalog.ReferencedColumns
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.catalog;
23
24
25 /**
26  *
27  * Provides information about the columns that are referenced by a
28  * CHECK CONSTRAINT definition.
29  *
30  * It is used in the column SYS.SYSCHECKS.REFERENCEDCOLUMNSDESCRIPTOR.
31  */
32 public interface ReferencedColumns
33 {
34     /**
35      * Returns an array of 1-based column positions in the table that the
36      * check constraint is on.
37      *
38      * @return An array of ints representing the 1-based column positions
39      * of the columns that are referenced in this check constraint.
40      */
41     public int[] getReferencedColumnPositions();
42 }
43
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