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/*
* Copyright (c) 2009, 2019, 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.
*
*/
package shared;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
public abstract class Checker {
protected Class staticTargetClass;
protected Class dynamicTargetClass;
protected String methodName;
public abstract String check (Class callSite);
public Checker(Class staticTargetClass, Class dynamicTargetClass) {
if (!staticTargetClass.isAssignableFrom(dynamicTargetClass)) {
throw new RuntimeException("Dynamic target class should be a subclass of the static target class.");
}
// **********************************************
// NB!!! All classes are assumed to be PUBLIC !!!
// **********************************************
Class klass = dynamicTargetClass;
while (klass != Object.class) {
if (!Modifier.isPublic(klass.getModifiers())) {
throw new AssertionError("Class "+klass.getName()+" isn't public.");
}
klass = klass.getSuperclass();
}
this.methodName = Utils.TARGET_METHOD_NAME;
this.staticTargetClass = staticTargetClass;
this.dynamicTargetClass = dynamicTargetClass;
}
protected Method getMethodInHierarchy (Class klass) {
return getMethodInHierarchy(klass, methodName);
}
protected Method getMethodInHierarchy (Class klass, String name) {
while (klass != null) {
Method method = getDeclaredMethod (klass, name);
if ( method != null) {
// TODO: why doesn't this check work in VM?
// int modifiers = method.getModifiers();
//
// if (Modifier.isPrivate(modifiers)) {
// if (klass == initialClass) {
// return method;
// }
// } else {
// return method;
// }
return method;
}
klass = klass.getSuperclass();
}
return null;
}
protected Method getMethod (Class klass) {
return getMethod (klass, methodName);
}
protected Method getDeclaredMethod (Class klass) {
return getDeclaredMethod (klass, methodName);
}
static protected Method getMethod (Class klass, String name) {
return findMethod (klass.getMethods(), name);
}
static protected Method getDeclaredMethod (Class klass, String name) {
return findMethod (klass.getDeclaredMethods(), name);
}
static protected Method findMethod (Method[] methods, String name) {
for (Method method : methods) {
if (name.equals(method.getName())) {
return method;
}
}
return null;
}
static public String getClassPackageName(Class klass) {
String name = klass.getName();
return getClassPackageName(name);
}
static public String getClassPackageName(String name) {
int lastDotIndex = name.lastIndexOf('.');
if (lastDotIndex > -1) {
return name.substring(0, lastDotIndex);
} else {
return "";
}
}
public static String abbreviateResult(String result) {
// Abbreviate exception names
result = result.replaceAll("java.lang.NullPointerException", "NPE");
result = result.replaceAll("java.lang.IllegalAccessError", "IAE");
result = result.replaceAll("java.lang.IllegalAccessException", "IAExc");
result = result.replaceAll("java.lang.NoSuchMethodError", "NSME");
result = result.replaceAll("java.lang.AbstractMethodError", "AME");
result = result.replaceAll("java.lang.IncompatibleClassChangeError", "ICCE");
result = result.replaceAll("java.lang.VerifyError", "VE");
result = result.replaceAll("java.lang.ClassFormatError", "CFE");
return result;
}
// Check access possibility from particular call site
protected boolean checkAccess(Class klass, Class callerClass) {
int modifiers = klass.getModifiers();
return checkAccess(modifiers, klass, callerClass);
}
protected boolean checkAccess(Method m, Class callerClass) {
int modifiers = m.getModifiers();
Class declaringClass = m.getDeclaringClass();
return checkAccess(modifiers, declaringClass, callerClass);
}
protected boolean checkAccess(int modifiers, Class klass, Class callerClass) {
if ( Modifier.isPublic(modifiers) ) {
return true;
} else if ( Modifier.isProtected(modifiers) ) {
if (klass.isAssignableFrom(callerClass)) {
return true;
} else if (getClassPackageName(klass).equals(getClassPackageName(callerClass))) {
return true;
}
} else if ( Modifier.isPrivate(modifiers)) {
if (klass == callerClass) {
return true;
}
} else if (getClassPackageName(klass).equals(getClassPackageName(callerClass))) {
return true;
} else {
// if method isn't accessible, IllegalAccessException is thrown
return false;
}
return false;
}
}
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