src/main/java/de/uapcore/lightpit/dao/AbstractDao.java@276ef00a336d
src/main/java/de/uapcore/lightpit/dao/AbstractDao.java
Wed, 13 May 2020 18:31:52 +0200
- author
- Mike Becker <universe@uap-core.de>
- date
- Wed, 13 May 2020 18:31:52 +0200
- changeset 40
- 276ef00a336d
- parent 39
- e722861558bb
- permissions
- -rw-r--r--
fixes handler signatures and one compile error for AbstractDao.setForeignKeyOrNull()
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2018 Mike Becker. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29 package de.uapcore.lightpit.dao;
31 import java.sql.PreparedStatement;
32 import java.sql.ResultSet;
33 import java.sql.SQLException;
34 import java.sql.Types;
35 import java.util.ArrayList;
36 import java.util.List;
37 import java.util.Optional;
38 import java.util.function.Function;
40 public abstract class AbstractDao<T> implements GenericDao<T> {
42 private final PreparedStatement listQuery;
44 protected AbstractDao(PreparedStatement listQuery) {
45 this.listQuery = listQuery;
46 }
48 public final T mapColumns(ResultSet result) throws SQLException {
49 return mapColumns(result, "");
50 }
52 public abstract T mapColumns(ResultSet result, String qualifier) throws SQLException;
54 /**
55 * Qualifies a column label if an qualifier is specified.
56 *
57 * @param qualifier an optional qualifier
58 * @param label the column label
59 * @return the label, qualified if necessary
60 */
61 protected final String qual(String qualifier, String label) {
62 if (qualifier == null || qualifier.isBlank()) {
63 return label;
64 } else {
65 return qualifier + "." + label;
66 }
67 }
69 protected final void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException {
70 if (str == null || str.isBlank()) {
71 stmt.setNull(index, Types.VARCHAR);
72 } else {
73 stmt.setString(index, str);
74 }
75 }
77 protected final <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException {
78 Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null);
79 if (key == null) {
80 stmt.setNull(index, Types.INTEGER);
81 } else {
82 stmt.setInt(index, key);
83 }
84 }
86 @Override
87 public List<T> list() throws SQLException {
88 List<T> list = new ArrayList<>();
89 try (ResultSet result = listQuery.executeQuery()) {
90 while (result.next()) {
91 list.add(mapColumns(result));
92 }
93 }
94 return list;
95 }
96 }
