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.render;
17
18 import java.util.Map;
19 import java.util.Optional;
20
21 import org.mybatis.dynamic.sql.SqlTable;
22
23 /**
24 * Returns the alias for a table if specified, or the table name itself.
25 * This is useful for join rendering when we always want to have an alias for the table.
26 *
27 * @author Jeff Butler
28 */
29 public class GuaranteedTableAliasCalculator extends ExplicitTableAliasCalculator {
30
31 private GuaranteedTableAliasCalculator(Map<SqlTable, String> aliases) {
32 super(aliases);
33 }
34
35 @Override
36 public Optional<String> aliasForColumn(SqlTable table) {
37 Optional<String> alias = super.aliasForColumn(table);
38 if (alias.isPresent()) {
39 return alias;
40 } else {
41 return Optional.of(table.tableName());
42 }
43 }
44
45 public static TableAliasCalculator of(Map<SqlTable, String> aliases) {
46 return new GuaranteedTableAliasCalculator(aliases);
47 }
48 }