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jlechner |
/* java.lang.reflect.AccessibleObject
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Copyright (C) 2001, 2005 Free Software Foundation, Inc.
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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 java.lang.reflect;
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/**
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* This class is the superclass of various reflection classes, and
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* allows sufficiently trusted code to bypass normal restrictions to
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* do necessary things like invoke private methods outside of the
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* class during Serialization. If you don't have a good reason
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* to mess with this, don't try. Fortunately, there are adequate
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* security checks before you can set a reflection object as accessible.
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*
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* @author Tom Tromey (tromey@cygnus.com)
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* @author Eric Blake (ebb9@email.byu.edu)
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* @see Field
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* @see Constructor
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* @see Method
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* @see ReflectPermission
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* @since 1.2
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* @status updated to 1.4
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*/
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public class AccessibleObject
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{
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/**
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* True if this object is marked accessible, which means the reflected
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* object bypasses normal security checks.
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*/
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// default visibility for use by inherited classes
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boolean flag = false;
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/**
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* Only the three reflection classes that extend this can create an
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* accessible object. This is not serializable for security reasons.
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*/
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protected AccessibleObject()
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{
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}
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/**
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* Return the accessibility status of this object.
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*
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* @return true if this object bypasses security checks
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*/
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public boolean isAccessible()
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{
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return flag;
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}
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/**
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* Convenience method to set the flag on a number of objects with a single
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* security check. If a security manager exists, it is checked for
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* <code>ReflectPermission("suppressAccessChecks")</code>.<p>
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*
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* It is forbidden to set the accessibility flag to true on any constructor
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* for java.lang.Class. This will result in a SecurityException. If the
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* SecurityException is thrown for any of the passed AccessibleObjects,
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* the accessibility flag will be set on AccessibleObjects in the array prior
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* to the one which resulted in the exception.
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*
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* @param array the array of accessible objects
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* @param flag the desired state of accessibility, true to bypass security
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* @throws NullPointerException if array is null
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* @throws SecurityException if the request is denied
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* @see SecurityManager#checkPermission(java.security.Permission)
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* @see RuntimePermission
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*/
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public static void setAccessible(AccessibleObject[] array, boolean flag)
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{
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checkPermission();
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for (int i = 0; i < array.length; i++)
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array[i].secureSetAccessible(flag);
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}
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/**
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* Sets the accessibility flag for this reflection object. If a security
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* manager exists, it is checked for
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* <code>ReflectPermission("suppressAccessChecks")</code>.<p>
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*
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* It is forbidden to set the accessibility flag to true on any constructor for
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* java.lang.Class. This will result in a SecurityException.
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*
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* @param flag the desired state of accessibility, true to bypass security
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* @throws NullPointerException if array is null
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* @throws SecurityException if the request is denied
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* @see SecurityManager#checkPermission(java.security.Permission)
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* @see RuntimePermission
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*/
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public void setAccessible(boolean flag)
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{
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checkPermission();
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secureSetAccessible(flag);
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}
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/**
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* Performs the specified security check, for
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* <code>ReflectPermission("suppressAccessChecks")</code>.
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*
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* @throws SecurityException if permission is denied
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*/
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private static void checkPermission()
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{
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkPermission(new ReflectPermission("suppressAccessChecks"));
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}
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/**
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* Performs the actual accessibility change, this must always be invoked
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* after calling checkPermission.
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*
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* @param flag the desired status
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* @throws SecurityException if flag is true and this is a constructor
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* for <code>java.lang.Class</code>.
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*/
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private void secureSetAccessible(boolean flag)
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{
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if (flag &&
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(this instanceof Constructor
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&& ((Constructor) this).getDeclaringClass() == Class.class))
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throw new SecurityException("Cannot make object accessible: " + this);
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this.flag = flag;
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}
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}
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