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