Wed, 13 May 2020 18:45:28 +0200
renames some crappy constants
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1 | /* |
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2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 | * |
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4 | * Copyright 2018 Mike Becker. All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions are met: |
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8 | * |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * |
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12 | * 2. Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * |
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16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 | * POSSIBILITY OF SUCH DAMAGE. |
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27 | * |
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28 | */ |
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29 | package de.uapcore.lightpit.dao; |
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30 | |
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31 | import java.sql.PreparedStatement; |
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32 | import java.sql.ResultSet; |
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33 | import java.sql.SQLException; |
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34 | import java.sql.Types; |
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35 | import java.util.ArrayList; |
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36 | import java.util.List; |
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37 | import java.util.Optional; |
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38 | import java.util.function.Function; |
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39 | |
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40 | public abstract class AbstractDao<T> implements GenericDao<T> { |
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41 | |
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42 | private final PreparedStatement listQuery; |
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43 | |
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44 | protected AbstractDao(PreparedStatement listQuery) { |
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45 | this.listQuery = listQuery; |
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46 | } |
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47 | |
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48 | public final T mapColumns(ResultSet result) throws SQLException { |
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49 | return mapColumns(result, ""); |
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50 | } |
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51 | |
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52 | public abstract T mapColumns(ResultSet result, String qualifier) throws SQLException; |
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53 | |
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54 | /** |
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55 | * Qualifies a column label if an qualifier is specified. |
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56 | * |
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57 | * @param qualifier an optional qualifier |
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58 | * @param label the column label |
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59 | * @return the label, qualified if necessary |
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60 | */ |
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61 | protected final String qual(String qualifier, String label) { |
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62 | if (qualifier == null || qualifier.isBlank()) { |
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63 | return label; |
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64 | } else { |
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65 | return qualifier + "." + label; |
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66 | } |
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67 | } |
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68 | |
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69 | protected final void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException { |
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70 | if (str == null || str.isBlank()) { |
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71 | stmt.setNull(index, Types.VARCHAR); |
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72 | } else { |
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73 | stmt.setString(index, str); |
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74 | } |
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75 | } |
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76 | |
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77 | protected final <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException { |
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78 | Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null); |
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79 | if (key == null) { |
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80 | stmt.setNull(index, Types.INTEGER); |
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81 | } else { |
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82 | stmt.setInt(index, key); |
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83 | } |
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84 | } |
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85 | |
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86 | @Override |
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87 | public List<T> list() throws SQLException { |
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88 | List<T> list = new ArrayList<>(); |
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89 | try (ResultSet result = listQuery.executeQuery()) { |
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90 | while (result.next()) { |
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91 | list.add(mapColumns(result)); |
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92 | } |
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93 | } |
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94 | return list; |
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95 | } |
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96 | } |