1 /* 2 * Copyright (c) 2013, 2014, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.xml.internal.bind.v2.runtime.property; 27 28 import com.sun.xml.internal.bind.v2.model.nav.Navigator; 29 30 import java.lang.reflect.Field; 31 import java.lang.reflect.InvocationTargetException; 32 import java.lang.reflect.Method; 33 import java.lang.reflect.Type; 34 import java.security.AccessController; 35 import java.security.PrivilegedAction; 36 import java.util.logging.Level; 37 import java.util.logging.Logger; 38 39 /** 40 * Utils class. 41 * 42 * WARNING: If you are doing any changes don't forget to change other Utils classes in different packages. 43 * 44 * Has *package private* access to avoid inappropriate usage. 45 */ 46 final class Utils { 47 48 private static final Logger LOGGER = Logger.getLogger(Utils.class.getName()); 49 50 /** 51 * static ReflectionNavigator field to avoid usage of reflection every time we use it. 52 */ 53 static final Navigator<Type, Class, Field, Method> REFLECTION_NAVIGATOR; 54 55 static { // we statically initializing REFLECTION_NAVIGATOR property 56 try { 57 final Class refNav = Class.forName("com.sun.xml.internal.bind.v2.model.nav.ReflectionNavigator"); 58 59 // requires accessClassInPackage privilege 60 final Method getInstance = AccessController.doPrivileged( 61 new PrivilegedAction<Method>() { 62 @Override 63 public Method run() { 64 try { 65 Method getInstance = refNav.getDeclaredMethod("getInstance"); 66 getInstance.setAccessible(true); 67 return getInstance; 68 } catch (NoSuchMethodException e) { 69 throw new IllegalStateException("ReflectionNavigator.getInstance can't be found"); 70 } 71 } 72 } 73 ); 74 75 //noinspection unchecked 76 REFLECTION_NAVIGATOR = (Navigator<Type, Class, Field, Method>) getInstance.invoke(null); 77 } catch (ClassNotFoundException e) { 78 throw new IllegalStateException("Can't find ReflectionNavigator class"); 79 } catch (InvocationTargetException e) { 80 throw new IllegalStateException("ReflectionNavigator.getInstance throws the exception"); 81 } catch (IllegalAccessException e) { 82 throw new IllegalStateException("ReflectionNavigator.getInstance method is inaccessible"); 83 } catch (SecurityException e) { 84 LOGGER.log(Level.FINE, "Unable to access ReflectionNavigator.getInstance", e); 85 throw e; 86 } 87 } 88 89 /** 90 * private constructor to avoid util class instantiating 91 */ 92 private Utils() { 93 } 94 }