aoqi@0: /*
aoqi@0:  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /**
aoqi@0:  * @test
aoqi@0:  * @bug 8003280
aoqi@0:  * @summary Add lambda tests
aoqi@0:  *   Test SAM conversion of lambda expressions in context of assignment, method call, return statement and cast.
aoqi@0:  * @compile SamConversion.java
aoqi@0:  * @run main SamConversion
aoqi@0:  */
aoqi@0: 
aoqi@0: public class SamConversion {
aoqi@0: 
aoqi@0:     static interface Foo {
aoqi@0:         Integer m(int i);
aoqi@0:     }
aoqi@0: 
aoqi@0:     static interface Bar {
aoqi@0:         int m(Integer i) throws Exception;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static String assertionStr = "";
aoqi@0: 
aoqi@0:     private static void assertTrue(boolean b) {
aoqi@0:         if(!b)
aoqi@0:             throw new AssertionError();
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static void test1(Foo foo) {
aoqi@0:         assertTrue(foo.m(1) == 2);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static void test2(Bar bar) {
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(1) == 2);
aoqi@0:         } catch (Exception e){
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     private static Bar test3(int i) {
aoqi@0:         switch (i) {
aoqi@0:         case 0:
aoqi@0:             return n -> n + 1;
aoqi@0:         case 1:
aoqi@0:             return (Integer n) -> 2 * n;
aoqi@0:         case 2:
aoqi@0:             return (Integer n) -> {return new Integer(n-1);};
aoqi@0:         case 3:
aoqi@0:             return n -> {throw new Exception();};
aoqi@0:         default:
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static void main(String[] args) {
aoqi@0: 
aoqi@0:         //assign:
aoqi@0:         Foo foo = (int n) -> n + 1; //explicit type and boxing
aoqi@0:         assertTrue(foo.m(1) == 2);
aoqi@0: 
aoqi@0:         foo = n -> n + 1; //type inferrred and boxing
aoqi@0:         assertTrue(foo.m(1) == 2);
aoqi@0: 
aoqi@0:         Bar bar = (Integer n) -> n + 1; //explicit type and unboxing
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(1) == 2);
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         bar = (Integer n) -> new Integer(n+1); //explicit type and unboxing twice
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(1) == 2);
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         bar = n -> n.intValue() + 1; //type inferred
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(1) == 2);
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         bar = n -> n + 1; // type inferred and unboxing
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(1) == 2);
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         //cast:
aoqi@0:         assertTrue(((Foo)n -> {return n+1;}).m(1) == 2); //statement (instead of expression) in lambda body
aoqi@0:         try {
aoqi@0:             assertTrue(((Bar)n -> {return n+1;}).m(1) == 2); //statement in lambda body
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         //method parameter:
aoqi@0:         test1((int n) -> new Integer(n+1)); //explicit type
aoqi@0:         test2((Integer n) -> n.intValue() + 1); //explicit type
aoqi@0: 
aoqi@0:         //return statement:
aoqi@0:         bar = test3(0);
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(1) == 2);
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0:         bar = test3(1);
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(3) == 6);
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0:         bar = test3(2);
aoqi@0:         try {
aoqi@0:             assertTrue(bar.m(10) == 9);
aoqi@0:         } catch (Exception e) {
aoqi@0:             assertTrue(false);
aoqi@0:         }
aoqi@0:         bar = test3(3);
aoqi@0:         try {
aoqi@0:             bar.m(10);
aoqi@0:             assertTrue(false);
aoqi@0:         } catch (Exception e) {}
aoqi@0:     }
aoqi@0: }