1 /*
2 * Copyright 2016-2025 the original author or authors.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * https://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.mybatis.dynamic.sql.exception;
17
18 import java.io.Serial;
19 import java.util.Objects;
20
21 import org.mybatis.dynamic.sql.SqlTable;
22 import org.mybatis.dynamic.sql.util.Messages;
23
24 /**
25 * This exception is thrown when a query is built that attempts to specify more than one
26 * alias for the same instance of an SqlTable object. That error that would produce a select
27 * statement that doesn't work.
28 *
29 * <p>This error usually occurs when building a self-join query. The workaround is to create
30 * a second instance of the SqlTable object to use in the self-join.
31 *
32 * @since 1.3.1
33 *
34 * @author Jeff Butler
35 */
36 public class DuplicateTableAliasException extends DynamicSqlException {
37
38 @Serial
39 private static final long serialVersionUID = -2631664872557787391L;
40
41 public DuplicateTableAliasException(SqlTable table, String newAlias, String existingAlias) {
42 super(generateMessage(Objects.requireNonNull(table),
43 Objects.requireNonNull(newAlias),
44 Objects.requireNonNull(existingAlias)));
45 }
46
47 private static String generateMessage(SqlTable table, String newAlias, String existingAlias) {
48 return Messages.getString("ERROR.1", table.tableName(), newAlias, existingAlias); //$NON-NLS-1$
49 }
50 }