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Java™ Platform Standard Ed. 6 |
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java.lang.Object java.lang.reflect.AccessibleObject
public class AccessibleObject
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.
Field
,
Method
,
Constructor
,
ReflectPermission
Constructor Summary | |
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protected |
AccessibleObject()
Constructor: only used by the Java Virtual Machine. |
Method Summary | ||
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|
getAnnotation(Class<T> annotationClass)
Returns this element's annotation for the specified type if such an annotation is present, else null. |
|
Annotation[] |
getAnnotations()
Returns all annotations present on this element. |
|
Annotation[] |
getDeclaredAnnotations()
Returns all annotations that are directly present on this element. |
|
boolean |
isAccessible()
Get the value of the accessible flag for this object. |
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boolean |
isAnnotationPresent(Class<? extends Annotation> annotationClass)
Returns true if an annotation for the specified type is present on this element, else false. |
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static void |
setAccessible(AccessibleObject[] array,
boolean flag)
Convenience method to set the accessible flag for an array of objects with a single security check (for efficiency). |
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void |
setAccessible(boolean flag)
Set the accessible flag for this object to the indicated boolean value. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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protected AccessibleObject()
Method Detail |
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public static void setAccessible(AccessibleObject[] array, boolean flag) throws SecurityException
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 Constructor
object for the class 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.
array
- the array of AccessibleObjectsflag
- the new value for the accessible flag
in each object
SecurityException
- if the request is denied.SecurityManager.checkPermission(java.security.Permission)
,
RuntimePermission
public void setAccessible(boolean flag) throws SecurityException
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 Constructor
object for
the class Class
).
A SecurityException
is raised if this object is a Constructor
object for the class
java.lang.Class
, and flag
is true.
flag
- the new value for the accessible flag
SecurityException
- if the request is denied.SecurityManager.checkPermission(java.security.Permission)
,
RuntimePermission
public boolean isAccessible()
public <T extends Annotation> T getAnnotation(Class<T> annotationClass)
AnnotatedElement
getAnnotation
in interface AnnotatedElement
annotationClass
- the Class object corresponding to the
annotation type
NullPointerException
- if the given annotation class is nullpublic boolean isAnnotationPresent(Class<? extends Annotation> annotationClass)
AnnotatedElement
isAnnotationPresent
in interface AnnotatedElement
annotationClass
- the Class object corresponding to the
annotation type
NullPointerException
- if the given annotation class is nullpublic Annotation[] getAnnotations()
AnnotatedElement
getAnnotations
in interface AnnotatedElement
public Annotation[] getDeclaredAnnotations()
AnnotatedElement
getDeclaredAnnotations
in interface AnnotatedElement
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Java™ Platform Standard Ed. 6 |
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