| /* |
| * Copyright (c) 2004, 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 5097856 |
| * @summary Computing hashCode of objects modeling generics shouldn't blow stack |
| * @author Joseph D. Darcy |
| */ |
| |
| import java.util.*; |
| import java.lang.reflect.*; |
| |
| public class HashCodeTest { |
| |
| // Mutually recursive interface types |
| interface Edge<N extends Node<? extends Edge<N>>> { |
| void setEndNode(N n); |
| } |
| interface Node<E extends Edge<? extends Node<E>>> { |
| E getOutEdge(); |
| } |
| |
| public static void main(String argv[]) { |
| List<Class<?>> classes = new ArrayList<Class<?>>(); |
| Set<TypeVariable> typeVariables = new HashSet<TypeVariable>(); |
| |
| classes.add(java.lang.Class.class);// Simple case |
| classes.add(java.util.Map.class); |
| classes.add(java.lang.Enum.class); // Contains f-bound |
| classes.add(Edge.class); |
| classes.add(Node.class); |
| |
| for(Class<?> clazz: classes) { |
| System.out.println(clazz); |
| |
| for (TypeVariable<?> tv : clazz.getTypeParameters()) { |
| int hc = tv.hashCode(); |
| typeVariables.add(tv); |
| System.out.printf("\t%s 0x%x (%d)%n", tv.getName(), hc, hc); |
| } |
| } |
| |
| // Loop over classes again, making sure all type variables are |
| // already present |
| int count = 0; |
| for(Class<?> clazz: classes) { |
| for (TypeVariable<?> tv : clazz.getTypeParameters()) { |
| if (!typeVariables.remove(tv)) |
| throw new RuntimeException("Type variable " + tv + " not found."); |
| } |
| } |
| |
| if (typeVariables.size() != 0 ) |
| throw new RuntimeException("Unexpected number of type variables."); |
| |
| } |
| } |