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jeremybenn |
/* ReflectUtil.java - JSR 166 reflection hooks
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Copyright (C) 2006 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package sun.reflect.misc;
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import java.lang.reflect.Modifier;
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public class ReflectUtil
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{
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// We use this inaccessible inner class as an argument type
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// in verifyMemberAccess. All current users of this method
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// in the JSR 166 RI pass 'null' for this argument, and
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// consequently we don't know what it means. Using a funny
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// type like this for the argument means that if the RI changes,
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// we will see a compilation error.
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private static class MustBeNull
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{
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}
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/**
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* Check if the current thread is allowed to access the package of
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* the declaringClass.
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*
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* @param declaringClass class name to check access to
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* @throws SecurityException if permission is denied
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* @throws NullPointerException if declaringClass is null
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*/
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public static void checkPackageAccess(Class declaringClass)
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{
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SecurityManager sm;
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if ((sm = System.getSecurityManager()) != null)
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{
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while (declaringClass.isArray())
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declaringClass = declaringClass.getComponentType();
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String name = declaringClass.getName();
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int i = name.lastIndexOf('.');
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if (i != -1) // if declaringClass is a member of a package
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{
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name = name.substring(0, i);
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sm.checkPackageAccess(name);
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}
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}
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}
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/**
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* Perform access checks on a member of a class. This API is
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* derived from the public domain code in the JSR 166 reference
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* implementation.
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* @param caller the class requesting access to the member
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* @param declarer the declaring class of the member
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* @param ignored unknown parameter; always null
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* @param modifiers the modifiers on the member
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* @return true if access is granted, false otherwise
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*/
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public static void ensureMemberAccess(Class caller,
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Class declarer,
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MustBeNull ignored,
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int modifiers)
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{
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// Same class, always ok.
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if (caller == declarer)
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return;
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// Public access is ok.
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if ((modifiers & Modifier.PUBLIC) != 0)
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return;
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// Protected access and request comes from
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// a subclass of the declarer -- ok.
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if ((modifiers & Modifier.PROTECTED) != 0
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&& declarer.isAssignableFrom(caller))
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return;
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// Package-private access, or protected access,
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// and the packages are the same --ok.
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if ((modifiers & Modifier.PRIVATE) == 0
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&& caller.getPackage() == declarer.getPackage())
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return;
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// Otherwise, no.
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throw new IllegalAccessError();
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}
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}
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