321 lines
8.7 KiB
Java
321 lines
8.7 KiB
Java
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8003280
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* @summary Add lambda tests
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* Test SAM conversion of method references in contexts of assignment, method/constructor argument,
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* return statement, array initializer, lambda expression body, conditional expression and cast.
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* @compile SamConversion.java
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* @run main SamConversion
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*/
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public class SamConversion {
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static int assertionCount = 0;
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static interface Foo {
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Integer m(int i);
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}
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static interface Bar {
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int m(Integer i) throws MyException;
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}
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private static void assertTrue(boolean b) {
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assertionCount++;
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if(!b)
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throw new AssertionError();
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}
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private static int test1(Foo foo) {
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return foo.m(1);
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}
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private static void test2(Bar bar, int result) {
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try {
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assertTrue(bar.m(1) == result);
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} catch (Exception e){
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assertTrue(false);
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}
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}
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private static Bar test3(int i) {
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switch (i) {
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case 0:
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return A::method1;
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case 1:
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return new A()::method2;
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case 2:
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return A::method3;
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case 3:
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return new A()::method4;
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case 4:
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return new A()::method5;
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case 5:
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return A::method6;
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default:
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return null;
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}
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}
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/**
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* Test SAM conversion of method reference in assignment context
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*/
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private static void testAssignment() {
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Foo foo = A::method1; //static reference, parameter type matching and return type matching
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assertTrue(foo.m(1) == 2);
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foo = new A()::method2; //instance reference, parameter type unboxing and return type boxing
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assertTrue(foo.m(1) == 3);
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foo = A::method3; //static reference, parameter type matching and return type boxing
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assertTrue(foo.m(1) == 4);
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foo = new A()::method4; //instance reference, parameter type unboxing and return type matching
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assertTrue(foo.m(1) == 5);
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foo = new A()::method5; //instance reference, parameter type unboxing and return type matching
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assertTrue(foo.m(1) == 6);
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Bar bar = A::method1;
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = new A()::method2;
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try {
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assertTrue(bar.m(1) == 3);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = A::method3;
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try {
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assertTrue(bar.m(1) == 4);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = new A()::method4;
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try {
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assertTrue(bar.m(1) == 5);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = new A()::method5;
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try {
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assertTrue(bar.m(1) == 6);
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} catch (Exception e) {
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assertTrue(false);
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}
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}
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/**
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* Test SAM conversion of method reference in method/constructor argument context
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*/
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private static void testMethodArgument() {
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assertTrue(test1(A::method1) == 2);
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assertTrue(test1(new A()::method2) == 3);
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assertTrue(test1(A::method3) == 4);
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assertTrue(test1(new A()::method4) == 5);
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assertTrue(test1(new A()::method5) == 6);
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test2(A::method1, 2);
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test2(new A()::method2, 3);
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test2(A::method3, 4);
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test2(new A()::method4, 5);
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test2(new A()::method5, 6);
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}
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/**
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* Test SAM conversion of method reference in return statement context
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*/
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private static void testReturnStatement() {
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Bar bar = test3(0);
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(1);
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try {
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assertTrue(bar.m(1) == 3);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(2);
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try {
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assertTrue(bar.m(1) == 4);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(3);
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try {
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assertTrue(bar.m(1) == 5);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(4);
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try {
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assertTrue(bar.m(1) == 6);
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} catch (Exception e) {
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assertTrue(false);
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}
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bar = test3(5);
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try {
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bar.m(1);
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assertTrue(false);
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} catch (MyException e) {
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} catch (Exception e) {
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assertTrue(false);
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}
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}
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/**
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* Test SAM conversion of method reference in cast context
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*/
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private static void testCast() {
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assertTrue(((Foo)A::method1).m(1) == 2);
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try {
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assertTrue(((Bar)new A()::method2).m(1) == 3);
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} catch (Exception e) {
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assertTrue(false);
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}
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}
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/**
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* Test SAM conversion of method reference in array initializer context
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*/
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private static void testArrayInitializer() {
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Object[] oarray = {"a", 1, (Foo)A::method3}; //last element need a cast
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Object[] oarray2 = {"a", 1, (Bar)new A()::method4}; //last element need a cast
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Foo[] farray = {A::method1, new A()::method2, A::method3, new A()::method4, new A()::method5};
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Bar[] barray = {A::method1, new A()::method2, A::method3, new A()::method4, new A()::method5, A::method6};
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}
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/**
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* Test SAM conversion of method reference in conditional expression context
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*/
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private static void testConditionalExpression(boolean b) {
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Foo f = b ? A::method3 : new A()::method5;
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if(b)
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assertTrue(f.m(1) == 4);
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else
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assertTrue(f.m(1) == 6);
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Bar bar = b ? A::method1 : A::method6;
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if(b) {
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try {
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assertTrue(bar.m(1) == 2);
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} catch (Exception e) {
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assertTrue(false);
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}
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}
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else {
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try {
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bar.m(1);
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assertTrue(false);
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} catch (MyException e) {
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} catch (Exception e) {
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assertTrue(false);
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}
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}
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}
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/**
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* Test SAM conversion of method reference in lambda expression body
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*/
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private static void testLambdaExpressionBody() {
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Foo f = n -> ((Foo)A::method3).m(n);
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assertTrue(f.m(1) == 4);
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Bar b = n -> { return ((Foo)new A()::method5).m(n); };
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try {
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assertTrue(b.m(1) == 6);
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} catch (Exception e) {
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assertTrue(false);
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}
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}
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public static void main(String[] args) {
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testAssignment();
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testMethodArgument();
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testReturnStatement();
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testCast();
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testArrayInitializer();
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testConditionalExpression(true);
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testConditionalExpression(false);
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testLambdaExpressionBody();
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assertTrue(assertionCount == 32);
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}
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static class MyException extends Exception {}
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static class A {
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int value = 0;
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A() {
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}
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A(Foo f) {
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value = f.m(9);
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}
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A(Bar b) {
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try {
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value = b.m(9);
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} catch (MyException e){}
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}
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static Integer method1(int n) {
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return n + 1;
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}
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int method2(Integer n) {
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return value == 0 ? n + 2 : n + value;
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}
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static int method3(int n) {
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return n + 3;
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}
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Integer method4(Integer n) {
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return value == 0 ? n + 4 : n + value;
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}
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Integer method5(Integer n) {
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return value == 0 ? new Integer(n + 5) : new Integer(n + value);
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}
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static int method6(Integer n) throws MyException{
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throw new MyException();
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}
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}
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}
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