Fri, 23 Oct 2020 18:40:50 +0200
migrate WebColor
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 2018 Mike Becker. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * */ package de.uapcore.lightpit.dao; import java.sql.*; import java.util.ArrayList; import java.util.List; import java.util.Optional; import java.util.function.Function; /** * Some DAO utilities. */ public final class Functions { public static void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException { if (str == null || str.isBlank()) { stmt.setNull(index, Types.VARCHAR); } else { stmt.setString(index, str); } } public static void setDateOrNull(PreparedStatement stmt, int index, Date date) throws SQLException { if (date == null) { stmt.setNull(index, Types.DATE); } else { stmt.setDate(index, date); } } public static <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException { Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null); if (key == null) { stmt.setNull(index, Types.INTEGER); } else { stmt.setInt(index, key); } } @FunctionalInterface public interface ResultSetMapper<T> { T apply(ResultSet rs) throws SQLException; } public static <T> List<T> list(PreparedStatement stmt, ResultSetMapper<T> mapper) throws SQLException { List<T> results = new ArrayList<>(); try (var result = stmt.executeQuery()) { while (result.next()) { final var project = mapper.apply(result); results.add(project); } } return results; } public static <T> T find(PreparedStatement stmt, ResultSetMapper<T> mapper) throws SQLException { try (var result = stmt.executeQuery()) { if (result.next()) { final var ent = mapper.apply(result); return ent; } else { return null; } } } private Functions() { } }