AccessibleObjectpublic class AccessibleObject extends Object implements AnnotatedElement| The AccessibleObject class is the base class for Field, Method and
Constructor objects. It provides the ability to flag a reflected
object as suppressing default Java language access control checks
when it is used. The access checks--for public, default (package)
access, protected, and private members--are performed when Fields,
Methods or Constructors are used to set or get fields, to invoke
methods, or to create and initialize new instances of classes,
respectively.
Setting the accessible flag in a reflected object
permits sophisticated applications with sufficient privilege, such
as Java Object Serialization or other persistence mechanisms, to
manipulate objects in a manner that would normally be prohibited. |
| Fields Summary |
|---|
| private static final Permission | ACCESS_PERMISSIONThe Permission object that is used to check whether a client
has sufficient privilege to defeat Java language access
control checks. | | boolean | override | | static final ReflectionFactory | reflectionFactory |
| Constructors Summary |
|---|
protected AccessibleObject()Constructor: only used by the Java Virtual Machine.
|
| Methods Summary |
|---|
| public T | getAnnotation(java.lang.Class annotationClass)
throw new AssertionError("All subclasses should override this method");
| | public java.lang.annotation.Annotation[] | getAnnotations()
return getDeclaredAnnotations();
| | public java.lang.annotation.Annotation[] | getDeclaredAnnotations()
throw new AssertionError("All subclasses should override this method");
| | public boolean | isAccessible()Get the value of the accessible flag for this object.
return override;
| | public boolean | isAnnotationPresent(java.lang.Class annotationClass)
return getAnnotation(annotationClass) != null;
| | public static void | setAccessible(java.lang.reflect.AccessibleObject[] array, boolean flag)Convenience method to set the accessible flag for an
array of objects with a single security check (for efficiency).
First, if there is a security manager, its
checkPermission method is called with a
ReflectPermission("suppressAccessChecks") permission.
A SecurityException is raised if flag is
true but accessibility of any of the elements of the input
array may not be changed (for example, if the element
object is a {@link Constructor} object for the class {@link
java.lang.Class}). In the event of such a SecurityException, the
accessibility of objects is set to flag for array elements
upto (and excluding) the element for which the exception occurred; the
accessibility of elements beyond (and including) the element for which
the exception occurred is unchanged.
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkPermission(ACCESS_PERMISSION);
for (int i = 0; i < array.length; i++) {
setAccessible0(array[i], flag);
}
| | public void | setAccessible(boolean flag)Set the accessible flag for this object to
the indicated boolean value. A value of true indicates that
the reflected object should suppress Java language access
checking when it is used. A value of false indicates
that the reflected object should enforce Java language access checks.
First, if there is a security manager, its
checkPermission method is called with a
ReflectPermission("suppressAccessChecks") permission.
A SecurityException is raised if flag is
true but accessibility of this object may not be changed
(for example, if this element object is a {@link Constructor} object for
the class {@link java.lang.Class}).
A SecurityException is raised if this object is a {@link
java.lang.reflect.Constructor} object for the class
java.lang.Class, and flag is true.
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkPermission(ACCESS_PERMISSION);
setAccessible0(this, flag);
| | private static void | setAccessible0(java.lang.reflect.AccessibleObject obj, boolean flag)
if (obj instanceof Constructor && flag == true) {
Constructor c = (Constructor)obj;
if (c.getDeclaringClass() == Class.class) {
throw new SecurityException("Can not make a java.lang.Class" +
" constructor accessible");
}
}
obj.override = flag;
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