universe@47: /*
universe@47:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@47:  *
universe@47:  * Copyright 2018 Mike Becker. All rights reserved.
universe@47:  *
universe@47:  * Redistribution and use in source and binary forms, with or without
universe@47:  * modification, are permitted provided that the following conditions are met:
universe@47:  *
universe@47:  *   1. Redistributions of source code must retain the above copyright
universe@47:  *      notice, this list of conditions and the following disclaimer.
universe@47:  *
universe@47:  *   2. Redistributions in binary form must reproduce the above copyright
universe@47:  *      notice, this list of conditions and the following disclaimer in the
universe@47:  *      documentation and/or other materials provided with the distribution.
universe@47:  *
universe@47:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@47:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@47:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@47:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@47:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@47:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@47:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@47:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@47:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@47:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@47:  * POSSIBILITY OF SUCH DAMAGE.
universe@47:  *
universe@47:  */
universe@47: package de.uapcore.lightpit.dao;
universe@47: 
universe@62: import java.sql.Date;
universe@47: import java.sql.PreparedStatement;
universe@47: import java.sql.SQLException;
universe@47: import java.sql.Types;
universe@47: import java.util.Optional;
universe@47: import java.util.function.Function;
universe@47: 
universe@47: /**
universe@47:  * Some DAO utilities.
universe@47:  */
universe@47: public final class Functions {
universe@47: 
universe@47:     public static void setStringOrNull(PreparedStatement stmt, int index, String str) throws SQLException {
universe@47:         if (str == null || str.isBlank()) {
universe@47:             stmt.setNull(index, Types.VARCHAR);
universe@47:         } else {
universe@47:             stmt.setString(index, str);
universe@47:         }
universe@47:     }
universe@47: 
universe@62:     public static void setDateOrNull(PreparedStatement stmt, int index, Date date) throws SQLException {
universe@62:         if (date == null) {
universe@62:             stmt.setNull(index, Types.DATE);
universe@62:         } else {
universe@62:             stmt.setDate(index, date);
universe@62:         }
universe@62:     }
universe@62: 
universe@47:     public static <T> void setForeignKeyOrNull(PreparedStatement stmt, int index, T instance, Function<? super T, Integer> keyGetter) throws SQLException {
universe@47:         Integer key = Optional.ofNullable(instance).map(keyGetter).orElse(null);
universe@47:         if (key == null) {
universe@47:             stmt.setNull(index, Types.INTEGER);
universe@47:         } else {
universe@47:             stmt.setInt(index, key);
universe@47:         }
universe@47:     }
universe@47: 
universe@47:     private Functions() {
universe@47: 
universe@47:     }
universe@47: }