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/*
* Copyright (c) 2011, 2013, 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 bridge methods in certain SAM conversion
* Tests that jdk.internal.lambda.disableEagerInitialization=true creates a
* get$Lambda method for non-capturing lambdas
* @compile BridgeMethod.java
* @run main BridgeMethod
* @run main/othervm -Djdk.internal.lambda.disableEagerInitialization=true BridgeMethod
*/
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
public class BridgeMethod {
interface H {Object m();}
interface K<T> {void m(T t);}
interface L extends K<String> {} //generic substitution
interface M {void m(String s);}
interface KM extends K<String>, M{} //generic substitution
interface N extends H {String m();} //covariant return
private static void assertTrue(boolean cond) {
if (!cond)
throw new AssertionError();
}
static void bar(String s) {
System.out.println("BridgeMethod.bar(String) " + s);
}
String moo() {
return "moo";
}
private static Set<String> setOfStringObject() {
Set<String> s = new HashSet<>();
s.add("java.lang.String");
s.add("java.lang.Object");
return s;
}
private static Set<String> allowedMethods() {
Set<String> s = new HashSet<>();
s.add("m");
if (Boolean.getBoolean("jdk.internal.lambda.disableEagerInitialization")) {
s.add("get$Lambda");
}
return s;
}
private static boolean matchingMethodNames(Method[] methods) {
Set<String> methodNames = new HashSet<>();
for (Method m : methods) {
methodNames.add(m.getName());
}
return methodNames.equals(allowedMethods());
}
public static void main(String[] args) {
L la = BridgeMethod::bar; //static reference
la.m("hi");
Class<? extends L> c1 = la.getClass();
Method[] methods = c1.getDeclaredMethods();
assertTrue(matchingMethodNames(methods));
Set<String> types = setOfStringObject();
System.out.println("methods in SAM conversion of L:");
for(Method m : methods) {
if (m.getName().equals("m")) {
System.out.println(m.toGenericString());
Class[] parameterTypes = m.getParameterTypes();
assertTrue(parameterTypes.length == 1);
assertTrue(types.remove(parameterTypes[0].getName()));
}
}
assertTrue(types.isEmpty() || (types.size() == 1 && types.contains("java.lang.String")));
KM km = BridgeMethod::bar;
//km.m("hi"); //will be uncommented when CR7028808 fixed
Class<? extends KM> c2 = km.getClass();
methods = c2.getDeclaredMethods();
assertTrue(matchingMethodNames(methods));
types = setOfStringObject();
System.out.println("methods in SAM conversion of KM:");
for(Method m : methods) {
if (m.getName().equals("m")) {
System.out.println(m.toGenericString());
Class<?>[] parameterTypes = m.getParameterTypes();
assertTrue(parameterTypes.length == 1);
assertTrue(types.remove(parameterTypes[0].getName()));
}
}
assertTrue(types.isEmpty());
N n = new BridgeMethod()::moo; //instance reference
assertTrue( n.m().equals("moo") );
assertTrue( ((H)n).m().equals("moo") );
Class<? extends N> c3 = n.getClass();
methods = c3.getDeclaredMethods();
types = setOfStringObject();
System.out.println("methods in SAM conversion of N:");
for(Method m : methods) {
System.out.println(m.toGenericString());
if (m.getName().equals("m")) {
Class<?> returnType = m.getReturnType();
assertTrue(types.remove(returnType.getName()));
}
}
assertTrue(types.size() == 1); //there's a bridge
}
}
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