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java/org/apache/el/util/Jre9Compat.java

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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 org.apache.el.util;
+
+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 javax.el
+ * When making changes keep the two in sync.
+ */
+class Jre9Compat extends JreCompat {
+
+    private static final Method canAccessMethod;
+
+
+    static {
+        Method m1 = null;
+        try {
+            m1 = AccessibleObject.class.getMethod("canAccess", new Class<?>[] { Object.class });
+        } catch (NoSuchMethodException e) {
+            // Expected for Java 8
+        }
+        canAccessMethod = m1;
+    }
+
+
+    public static boolean isSupported() {
+        return canAccessMethod != null;
+    }
+
+
+    @Override
+    public boolean canAcccess(Object base, AccessibleObject accessibleObject) {
+        try {
+            return ((Boolean) canAccessMethod.invoke(accessibleObject, base)).booleanValue();
+        } catch (ReflectiveOperationException | IllegalArgumentException e) {
+            return false;
+        }
+    }
+}