1 /* 2 * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import org.testng.Assert; 25 import org.testng.annotations.Test; 26 27 import java.lang.invoke.MethodHandles; 28 import java.lang.reflect.code.interpreter.Interpreter; 29 import java.util.stream.Stream; 30 31 /* 32 * @test 33 * @enablePreview 34 * @run testng TestLinq 35 */ 36 37 public class TestLinq { 38 39 // A record modeling a table with three columns, one for each component 40 record Customer(String contactName, String phone, String city) { 41 } 42 43 @Test 44 public void testSimpleQuery() { 45 QueryProvider qp = new TestQueryProvider(); 46 47 // Query all customers based in London, and return their names 48 QueryResult<Stream<String>> qr = qp.query(Customer.class) 49 .where(c -> c.city.equals("London")) 50 .select(c -> c.contactName) 51 .elements(); 52 53 System.out.println(qr.expression().toText()); 54 55 @SuppressWarnings("unchecked") 56 QueryResult<Stream<String>> qr2 = (QueryResult<Stream<String>>) Interpreter.invoke(MethodHandles.lookup(), 57 qr.expression(), qp.query(Customer.class)); 58 System.out.println(qr2.expression().toText()); 59 60 Assert.assertEquals(qr.expression().toText(), qr2.expression().toText()); 61 } 62 }