1 /* 2 * Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 package invokeinterface; 26 27 import java.lang.reflect.Method; 28 import java.lang.reflect.Modifier; 29 30 public class Checker extends shared.Checker { 31 private Class interfaceClass; 32 33 public Checker(Class interfaceClass, Class dynamicTargetClass) { 34 super(interfaceClass, dynamicTargetClass); 35 36 if (staticTargetClass.isInterface()) { 37 this.interfaceClass = staticTargetClass; 38 } else { 39 throw new RuntimeException("Static target class should be an interface."); 40 } 41 } 42 43 public String check (Class callerClass) { 44 // Check access rights to interface for caller 45 if (!checkAccess(interfaceClass, callerClass)) { 46 return "java.lang.IllegalAccessError"; 47 } 48 49 // NSME is thrown when interface doesn't declare the method 50 if (getDeclaredMethod(interfaceClass) == null) { 51 return "java.lang.NoSuchMethodError"; 52 } 53 54 // 9.1.5 Access to Interface Member Names 55 // "All interface members are implicitly public. They are 56 // accessible outside the package where the interface is 57 // declared if the interface is also declared public or 58 // protected, in accordance with the rules of 6.6." 59 60 // Search for method declaration in the hierarchy 61 Class klass = dynamicTargetClass; 62 63 while (klass != Object.class) { 64 Method method = getDeclaredMethod(klass); 65 66 if (method != null) { 67 int modifiers = method.getModifiers(); 68 69 // Check whether obtained method is public and isn't abstract 70 if ( Modifier.isPublic(modifiers)) 71 { 72 if (Modifier.isAbstract(modifiers)) { 73 return "java.lang.AbstractMethodError"; 74 } else { 75 return String.format("%s.%s" 76 , method.getDeclaringClass().getSimpleName() 77 , methodName 78 ); 79 } 80 } else { 81 // IAE is thrown when located method isn't PUBLIC 82 // or private. Private methods are skipped when 83 // looking for an interface method. 84 if (!Modifier.isPrivate(modifiers)) { 85 return "java.lang.IllegalAccessError"; 86 } 87 } 88 } 89 90 klass = klass.getSuperclass(); 91 } 92 93 // No method declaration is found 94 return "java.lang.AbstractMethodError"; 95 } 96 }