From a8541b8fccc49f7b0dc378cb2cc8ab2db04fd0cb Mon Sep 17 00:00:00 2001 From: Lukas Eder Date: Fri, 14 Nov 2014 14:15:36 +0100 Subject: [PATCH] [#3769] Add org.jooq.Converters, a chained Converter implementation --- jOOQ/src/main/java/org/jooq/Converters.java | 131 ++++++++++++++++++ .../java/org/jooq/test/ConverterTest.java | 54 ++++++++ 2 files changed, 185 insertions(+) create mode 100644 jOOQ/src/main/java/org/jooq/Converters.java diff --git a/jOOQ/src/main/java/org/jooq/Converters.java b/jOOQ/src/main/java/org/jooq/Converters.java new file mode 100644 index 0000000000..6e33f77851 --- /dev/null +++ b/jOOQ/src/main/java/org/jooq/Converters.java @@ -0,0 +1,131 @@ +/** + * Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com) + * All rights reserved. + * + * This work is dual-licensed + * - under the Apache Software License 2.0 (the "ASL") + * - under the jOOQ License and Maintenance Agreement (the "jOOQ License") + * ============================================================================= + * You may choose which license applies to you: + * + * - If you're using this work with Open Source databases, you may choose + * either ASL or jOOQ License. + * - If you're using this work with at least one commercial database, you must + * choose jOOQ License + * + * For more information, please visit http://www.jooq.org/licenses + * + * Apache Software License 2.0: + * ----------------------------------------------------------------------------- + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * jOOQ License and Maintenance Agreement: + * ----------------------------------------------------------------------------- + * Data Geekery grants the Customer the non-exclusive, timely limited and + * non-transferable license to install and use the Software under the terms of + * the jOOQ License and Maintenance Agreement. + * + * This library is distributed with a LIMITED WARRANTY. See the jOOQ License + * and Maintenance Agreement for more details: http://www.jooq.org/licensing + */ +package org.jooq; + +import org.jooq.impl.SQLDataType; + +/** + * A chain of converters. + * + * @param The database type - i.e. any type available from + * {@link SQLDataType} + * @param The user type + * @author Lukas Eder + */ +@SuppressWarnings({ "rawtypes", "unchecked" }) +public class Converters implements Converter { + + /** + * Generated UID + */ + private static final long serialVersionUID = -4307758248063822630L; + + final Converter[] chain; + + /** + * Create an identity converter. + */ + public static Converter of() { + return new Converters(); + } + + /** + * Create a single converter. + */ + public static Converter of(Converter converter) { + return new Converters(converter); + } + + /** + * Chain two converters. + */ + public static Converter of(Converter c1, Converter c2) { + return new Converters(c1, c2); + } + + /** + * Chain three converters. + */ + public static Converter of(Converter c1, Converter c2, Converter c3) { + return new Converters(c1, c2, c3); + } + + /** + * Chain four converters. + */ + public static Converter of(Converter c1, Converter c2, Converter c3, Converter c4) { + return new Converters(c1, c2, c3, c4); + } + + Converters(Converter... chain) { + this.chain = chain == null ? new Converter[0] : chain; + } + + @Override + public final U from(T t) { + Object result = t; + + for (int i = 0; i < chain.length; i++) + result = chain[i].from(result); + + return (U) result; + } + + @Override + public final T to(U u) { + Object result = u; + + for (int i = chain.length - 1; i >= 0; i--) + result = chain[i].to(result); + + return (T) result; + } + + @Override + public final Class fromType() { + return chain[0].fromType(); + } + + @Override + public final Class toType() { + return chain[chain.length - 1].toType(); + } +} diff --git a/jOOQ/src/test/java/org/jooq/test/ConverterTest.java b/jOOQ/src/test/java/org/jooq/test/ConverterTest.java index a6424379e0..ba832e9bc8 100644 --- a/jOOQ/src/test/java/org/jooq/test/ConverterTest.java +++ b/jOOQ/src/test/java/org/jooq/test/ConverterTest.java @@ -44,6 +44,8 @@ import static org.jooq.test.data.BoolTable.BOOL_TABLE; import java.sql.SQLException; +import org.jooq.Converter; +import org.jooq.Converters; import org.jooq.Result; import org.jooq.impl.DSL; import org.jooq.test.data.BoolRecord; @@ -96,4 +98,56 @@ public class ConverterTest extends AbstractTest { assertEquals(Bool.FALSE, BOOL_TABLE.BOOL.getDataType().convert(0)); assertEquals(Bool.FALSE, BOOL_TABLE.BOOL.getDataType().convert("false")); } + + @SuppressWarnings("serial") + @Test + public void testChainedConverters() { + Converter c1 = Converters.of(); + + assertEquals(1, (int) c1.from(1)); + assertEquals(1, (int) c1.to(1)); + assertEquals(1, (int) c1.from(c1.to(1))); + + Converter add = new Converter() { + @Override + public Integer from(Integer t) { + return t + 1; + } + + @Override + public Integer to(Integer u) { + return u - 1; + } + + @Override + public Class fromType() { + return Integer.class; + } + + @Override + public Class toType() { + return Integer.class; + } + }; + + Converter c2 = Converters.of(add); + Converter c3 = Converters.of(add, add); + Converter c4 = Converters.of(add, add, add); + Converter c5 = Converters.of(add, add, add, add); + + assertEquals(2, (int) c2.from(1)); + assertEquals(3, (int) c3.from(1)); + assertEquals(4, (int) c4.from(1)); + assertEquals(5, (int) c5.from(1)); + + assertEquals(1, (int) c2.to(2)); + assertEquals(1, (int) c3.to(3)); + assertEquals(1, (int) c4.to(4)); + assertEquals(1, (int) c5.to(5)); + + assertEquals(1, (int) c2.from(c2.to(1))); + assertEquals(1, (int) c3.from(c3.to(1))); + assertEquals(1, (int) c4.from(c4.to(1))); + assertEquals(1, (int) c5.from(c5.to(1))); + } }