java.lang.reflect.AccessibleObject Maven / Gradle / Ivy
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package java.lang.reflect;
import java.lang.annotation.Annotation;
/**
* 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 {@code 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.
*
*
By default, a reflected object is not accessible.
*
* @see Field
* @see Method
* @see Constructor
* @see ReflectPermission
*
* @since 1.2
*/
public class AccessibleObject implements AnnotatedElement {
/**
* Convenience method to set the {@code accessible} flag for an
* array of objects with a single security check (for efficiency).
*
*
First, if there is a security manager, its
* {@code checkPermission} method is called with a
* {@code ReflectPermission("suppressAccessChecks")} permission.
*
*
A {@code SecurityException} is raised if {@code flag} is
* {@code true} but accessibility of any of the elements of the input
* {@code 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 {@code 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.
*
* @param array the array of AccessibleObjects
* @param flag the new value for the {@code accessible} flag
* in each object
* @throws SecurityException if the request is denied.
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*/
public static void setAccessible(AccessibleObject[] array, boolean flag)
throws SecurityException {
throw new SecurityException();
}
/**
* Set the {@code accessible} flag for this object to
* the indicated boolean value. A value of {@code true} indicates that
* the reflected object should suppress Java language access
* checking when it is used. A value of {@code false} indicates
* that the reflected object should enforce Java language access checks.
*
*
First, if there is a security manager, its
* {@code checkPermission} method is called with a
* {@code ReflectPermission("suppressAccessChecks")} permission.
*
*
A {@code SecurityException} is raised if {@code flag} is
* {@code 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 {@code SecurityException} is raised if this object is a {@link
* java.lang.reflect.Constructor} object for the class
* {@code java.lang.Class}, and {@code flag} is true.
*
* @param flag the new value for the {@code accessible} flag
* @throws SecurityException if the request is denied.
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*/
public void setAccessible(boolean flag) throws SecurityException {
throw new SecurityException();
}
/**
* Get the value of the {@code accessible} flag for this object.
*
* @return the value of the object's {@code accessible} flag
*/
public boolean isAccessible() {
return override;
}
/**
* Constructor: only used by the Java Virtual Machine.
*/
protected AccessibleObject() {}
// Indicates whether language-level access checks are overridden
// by this object. Initializes to "false". This field is used by
// Field, Method, and Constructor.
//
// NOTE: for security purposes, this field must not be visible
// outside this package.
boolean override;
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
public T getAnnotation(Class annotationClass) {
throw new AssertionError("All subclasses should override this method");
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
public boolean isAnnotationPresent(
Class annotationClass) {
return getAnnotation(annotationClass) != null;
}
/**
* @since 1.5
*/
public Annotation[] getAnnotations() {
return getDeclaredAnnotations();
}
/**
* @since 1.5
*/
public Annotation[] getDeclaredAnnotations() {
throw new AssertionError("All subclasses should override this method");
}
}