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 }