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test/tools/javac/lambda/methodReference/BridgeMethod.java@959103a6100f (annotated)

test/tools/javac/lambda/methodReference/BridgeMethod.java

Wed, 27 Apr 2016 01:34:52 +0800

author

aoqi

date

Wed, 27 Apr 2016 01:34:52 +0800

changeset 0

959103a6100f

child 2525

2eb010b6cb22

permissions

-rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/langtools/
changeset: 2573:53ca196be1ae
tag: jdk8u25-b17

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*/
aoqi@0	23
aoqi@0	24	/**
aoqi@0	25	* @test
aoqi@0	26	* @bug 8003280
aoqi@0	27	* @summary Add lambda tests
aoqi@0	28	* Test bridge methods in certain SAM conversion
aoqi@0	29	* @compile BridgeMethod.java
aoqi@0	30	* @run main BridgeMethod
aoqi@0	31	*/
aoqi@0	32
aoqi@0	33	import java.lang.reflect.Method;
aoqi@0	34	import java.util.HashSet;
aoqi@0	35	import java.util.Set;
aoqi@0	36
aoqi@0	37	public class BridgeMethod {
aoqi@0	38
aoqi@0	39	interface H {Object m();}
aoqi@0	40
aoqi@0	41	interface K<T> {void m(T t);}
aoqi@0	42
aoqi@0	43	interface L extends K<String> {} //generic substitution
aoqi@0	44
aoqi@0	45	interface M {void m(String s);}
aoqi@0	46
aoqi@0	47	interface KM extends K<String>, M{} //generic substitution
aoqi@0	48
aoqi@0	49	interface N extends H {String m();} //covariant return
aoqi@0	50
aoqi@0	51	private static void assertTrue(boolean cond) {
aoqi@0	52	if (!cond)
aoqi@0	53	throw new AssertionError();
aoqi@0	54	}
aoqi@0	55
aoqi@0	56	static void bar(String s) {
aoqi@0	57	System.out.println("BridgeMethod.bar(String) " + s);
aoqi@0	58	}
aoqi@0	59
aoqi@0	60	String moo() {
aoqi@0	61	return "moo";
aoqi@0	62	}
aoqi@0	63
aoqi@0	64	private static Set<String> setOfStringObject() {
aoqi@0	65	Set<String> s = new HashSet<>();
aoqi@0	66	s.add("java.lang.String");
aoqi@0	67	s.add("java.lang.Object");
aoqi@0	68	return s;
aoqi@0	69	}
aoqi@0	70
aoqi@0	71	public static void main(String[] args) {
aoqi@0	72	L la = BridgeMethod::bar; //static reference
aoqi@0	73	la.m("hi");
aoqi@0	74	Class<? extends L> c1 = la.getClass();
aoqi@0	75	Method[] methods = c1.getDeclaredMethods();
aoqi@0	76	Set<String> types = setOfStringObject();
aoqi@0	77	System.out.println("methods in SAM conversion of L:");
aoqi@0	78	for(Method m : methods) {
aoqi@0	79	System.out.println(m.toGenericString());
aoqi@0	80	assertTrue(m.getName().equals("m"));
aoqi@0	81	Class[] parameterTypes = m.getParameterTypes();
aoqi@0	82	assertTrue(parameterTypes.length == 1);
aoqi@0	83	assertTrue(types.remove(parameterTypes[0].getName()));
aoqi@0	84	}
aoqi@0	85	assertTrue(types.isEmpty() || (types.size() == 1 && types.contains("java.lang.String")));
aoqi@0	86
aoqi@0	87	KM km = BridgeMethod::bar;
aoqi@0	88	//km.m("hi"); //will be uncommented when CR7028808 fixed
aoqi@0	89	Class<? extends KM> c2 = km.getClass();
aoqi@0	90	methods = c2.getDeclaredMethods();
aoqi@0	91	types = setOfStringObject();
aoqi@0	92	System.out.println("methods in SAM conversion of KM:");
aoqi@0	93	for(Method m : methods) {
aoqi@0	94	System.out.println(m.toGenericString());
aoqi@0	95	assertTrue(m.getName().equals("m"));
aoqi@0	96	Class<?>[] parameterTypes = m.getParameterTypes();
aoqi@0	97	assertTrue(parameterTypes.length == 1);
aoqi@0	98	assertTrue(types.remove(parameterTypes[0].getName()));
aoqi@0	99	}
aoqi@0	100	assertTrue(types.isEmpty());
aoqi@0	101
aoqi@0	102	N n = new BridgeMethod()::moo; //instance reference
aoqi@0	103	assertTrue( n.m().equals("moo") );
aoqi@0	104	assertTrue( ((H)n).m().equals("moo") );
aoqi@0	105	Class<? extends N> c3 = n.getClass();
aoqi@0	106	methods = c3.getDeclaredMethods();
aoqi@0	107	types = setOfStringObject();
aoqi@0	108	System.out.println("methods in SAM conversion of N:");
aoqi@0	109	for(Method m : methods) {
aoqi@0	110	System.out.println(m.toGenericString());
aoqi@0	111	if (m.getName().equals("m")) {
aoqi@0	112	Class<?> returnType = m.getReturnType();
aoqi@0	113	assertTrue(types.remove(returnType.getName()));
aoqi@0	114	}
aoqi@0	115	}
aoqi@0	116	assertTrue(types.size() == 1); //there's a bridge
aoqi@0	117	}
aoqi@0	118	}