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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.el;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Method;
/*
* This is a cut down version of org.apache.tomcat.util.Jre9Compat that provides
* only the methods required by the EL implementation.
*
* This class is duplicated in org.apache.el.util
* When making changes keep the two in sync.
*/
class Jre9Compat extends JreCompat {
private static final Method canAccessMethod;
private static final Method getModuleMethod;
private static final Method isExportedMethod;
static {
Method m1 = null;
Method m2 = null;
Method m3 = null;
try {
m1 = AccessibleObject.class.getMethod("canAccess", Object.class);
m2 = Class.class.getMethod("getModule");
Class<?> moduleClass = Class.forName("java.lang.Module");
m3 = moduleClass.getMethod("isExported", String.class);
} catch (NoSuchMethodException e) {
// Expected for Java 8
} catch (ClassNotFoundException e) {
// Can't log this so...
throw new RuntimeException(e);
}
canAccessMethod = m1;
getModuleMethod = m2;
isExportedMethod = m3;
}
public static boolean isSupported() {
return canAccessMethod != null;
}
@Override
public boolean canAccess(Object base, AccessibleObject accessibleObject) {
try {
return ((Boolean) canAccessMethod.invoke(accessibleObject, base)).booleanValue();
} catch (ReflectiveOperationException | IllegalArgumentException e) {
return false;
}
}
@Override
public boolean isExported(Class<?> type) {
try {
String packageName = type.getPackage().getName();
Object module = getModuleMethod.invoke(type);
return ((Boolean) isExportedMethod.invoke(module, packageName)).booleanValue();
} catch (ReflectiveOperationException e) {
return false;
}
}
}
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