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1 files changed, 233 insertions, 0 deletions

diff --git a/libjava/classpath/java/lang/reflect/AccessibleObject.java b/libjava/classpath/java/lang/reflect/AccessibleObject.java
new file mode 100644
index 000000000..75676913d
--- /dev/null
+++ b/libjava/classpath/java/lang/reflect/AccessibleObject.java
@@ -0,0 +1,233 @@
+/* java.lang.reflect.AccessibleObject
+   Copyright (C) 2001, 2005, 2006  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.lang.reflect;
+
+import java.lang.annotation.Annotation;
+
+/**
+ * This class is the superclass of various reflection classes, and
+ * allows sufficiently trusted code to bypass normal restrictions to
+ * do necessary things like invoke private methods outside of the
+ * class during Serialization.  If you don't have a good reason
+ * to mess with this, don't try. Fortunately, there are adequate
+ * security checks before you can set a reflection object as accessible.
+ *
+ * @author Tom Tromey (tromey@cygnus.com)
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @see Field
+ * @see Constructor
+ * @see Method
+ * @see ReflectPermission
+ * @since 1.2
+ * @status updated to 1.5
+ */
+public class AccessibleObject
+    implements AnnotatedElement
+{
+  /**
+   * True if this object is marked accessible, which means the reflected
+   * object bypasses normal security checks.
+   */
+  // default visibility for use by inherited classes
+  boolean flag = false;
+
+  /**
+   * Only the three reflection classes that extend this can create an
+   * accessible object.  This is not serializable for security reasons.
+   */
+  protected AccessibleObject()
+  {
+  }
+
+  /**
+   * Return the accessibility status of this object.
+   *
+   * @return true if this object bypasses security checks
+   */
+  public boolean isAccessible()
+  {
+    return flag;
+  }
+
+  /**
+   * Convenience method to set the flag on a number of objects with a single
+   * security check. If a security manager exists, it is checked for
+   * <code>ReflectPermission("suppressAccessChecks")</code>.<p>
+   *
+   * It is forbidden to set the accessibility flag to true on any constructor
+   * for java.lang.Class. This will result in a SecurityException. If the
+   * SecurityException is thrown for any of the passed AccessibleObjects,
+   * the accessibility flag will be set on AccessibleObjects in the array prior
+   * to the one which resulted in the exception.
+   *
+   * @param array the array of accessible objects
+   * @param flag the desired state of accessibility, true to bypass security
+   * @throws NullPointerException if array is null
+   * @throws SecurityException if the request is denied
+   * @see SecurityManager#checkPermission(java.security.Permission)
+   * @see RuntimePermission
+   */
+  public static void setAccessible(AccessibleObject[] array, boolean flag)
+  {
+    checkPermission();
+    for (int i = 0; i < array.length; i++)
+      array[i].secureSetAccessible(flag);
+  }
+
+  /**
+   * Sets the accessibility flag for this reflection object. If a security
+   * manager exists, it is checked for
+   * <code>ReflectPermission("suppressAccessChecks")</code>.<p>
+   *
+   * It is forbidden to set the accessibility flag to true on any constructor for
+   * java.lang.Class. This will result in a SecurityException.
+   *
+   * @param flag the desired state of accessibility, true to bypass security
+   * @throws NullPointerException if array is null
+   * @throws SecurityException if the request is denied
+   * @see SecurityManager#checkPermission(java.security.Permission)
+   * @see RuntimePermission
+   */
+  public void setAccessible(boolean flag)
+  {
+    checkPermission();
+    secureSetAccessible(flag);
+  }
+
+  /**
+   * Performs the specified security check, for
+   * <code>ReflectPermission("suppressAccessChecks")</code>.
+   *
+   * @throws SecurityException if permission is denied
+   */
+  private static void checkPermission()
+  {
+    SecurityManager sm = System.getSecurityManager();
+    if (sm != null)
+      sm.checkPermission(new ReflectPermission("suppressAccessChecks"));
+  }
+
+  /**
+   * Performs the actual accessibility change, this must always be invoked
+   * after calling checkPermission.
+   *
+   * @param flag the desired status
+   * @throws SecurityException if flag is true and this is a constructor
+   * for <code>java.lang.Class</code>.
+   */
+  private void secureSetAccessible(boolean flag)
+  {
+    if (flag &&
+        (this instanceof Constructor
+          && ((Constructor) this).getDeclaringClass() == Class.class))
+      throw new SecurityException("Cannot make object accessible: " + this);
+    this.flag = flag;
+  }
+
+  /**
+   * <p>
+   * Returns the element's annotation for the specified annotation type,
+   * or <code>null</code> if no such annotation exists.
+   * </p>
+   * <p>
+   * <strong>This method must be overridden by subclasses to provide
+   * appropriate behaviour.</strong>
+   * </p>
+   *
+   * @param annotationClass the type of annotation to look for.
+   * @return this element's annotation for the specified type, or
+   *         <code>null</code> if no such annotation exists.
+   * @throws NullPointerException if the annotation class is <code>null</code>.
+   */
+  public <T extends Annotation> T getAnnotation(Class<T> annotationClass)
+  {
+    throw new AssertionError("Subclass must override this method");
+  }
+
+  /**
+   * Returns all annotations associated with the element.  If there are
+   * no annotations associated with the element, then a zero-length array
+   * will be returned.  The returned array may be modified by the client
+   * code, but this will have no effect on the annotation content of the
+   * element, and hence no effect on the return value of this method for
+   * future callers.
+   *
+   * @return this element's annotations.
+   */
+  public Annotation[] getAnnotations()
+  {
+    return getDeclaredAnnotations();
+  }
+
+  /**
+   * <p>
+   * Returns all annotations directly defined by the element.  If there are
+   * no annotations directly associated with the element, then a zero-length
+   * array will be returned.  The returned array may be modified by the client
+   * code, but this will have no effect on the annotation content of this
+   * class, and hence no effect on the return value of this method for
+   * future callers.
+   * </p>
+   * <p>
+   * <strong>This method must be overridden by subclasses to provide
+   * appropriate behaviour.</strong>
+   * </p>
+   *
+   * @return the annotations directly defined by the element.
+   * @since 1.5
+   */
+  public Annotation[] getDeclaredAnnotations()
+  {
+    throw new AssertionError("Subclass must override this method");
+  }
+
+  /**
+   * Returns true if an annotation for the specified type is associated
+   * with the element.  This is primarily a short-hand for using marker
+   * annotations.
+   *
+   * @param annotationClass the type of annotation to look for.
+   * @return true if an annotation exists for the specified type.
+   * @since 1.5
+   */
+  public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass)
+  {
+    return getAnnotation(annotationClass) != null;
+  }
+}