Initial revision

From-SVN: r102074

libjava/classpath/java/security/AllPermission.java

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+/* AllPermission.java -- Permission to do anything
+   Copyright (C) 1998, 2001, 2002, 2004, 2005  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.security;
+
+import gnu.java.util.EmptyEnumeration;
+
+import java.util.Collections;
+import java.util.Enumeration;
+
+/**
+ * This class is a permission that implies all other permissions.  Granting
+ * this permission effectively grants all others.  Extreme caution should
+ * be exercised in granting this permission.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @author Eric Blake (ebb9@email.byu.edu)
+ * @see AccessController
+ * @see Permissions
+ * @see SecurityManager
+ * @since 1.1
+ * @status updated to 1.4
+ */
+public final class AllPermission extends Permission
+{
+  /**
+   * Compatible with JDK 1.1+.
+   */
+  private static final long serialVersionUID = -2916474571451318075L;
+
+  /**
+   * Create a new AllPermission object.
+   */
+  public AllPermission()
+  {
+    super("*");
+  }
+
+  /**
+   * Create a new AllPermission object. The parameters are ignored, as all
+   * permission implies ALL PERMISSION.
+   *
+   * @param name ignored
+   * @param actions ignored
+   */
+  public AllPermission(String name, String actions)
+  {
+    super("*");
+  }
+
+  /**
+   * This method always returns <code>true</code> to indicate that this
+   * permission always implies that any other permission is also granted.
+   *
+   * @param perm ignored
+   * @return true, the permission is implied
+   */
+  public boolean implies(Permission perm)
+  {
+    return true;
+  }
+
+  /**
+   * Checks an object for equality. All AllPermissions are equal.
+   *
+   * @param obj the <code>Object</code> to test for equality
+   */
+  public boolean equals(Object obj)
+  {
+    return obj instanceof AllPermission;
+  }
+
+  /**
+   * This method returns a hash code for this object. This returns 1.
+   *
+   * @return a hash value for this object
+   */
+  public int hashCode()
+  {
+    return 1;
+  }
+
+  /**
+   * This method returns the list of actions associated with this object.
+   * This will always be the empty string ("") for this class.
+   *
+   * @return the action list
+   */
+  public String getActions()
+  {
+    return "";
+  }
+
+  /**
+   * Returns a PermissionCollection which can hold AllPermission.
+   *
+   * @return a permission collection
+   */
+  public PermissionCollection newPermissionCollection()
+  {
+    return new AllPermissionCollection();
+  }
+
+  /**
+   * Implements AllPermission.newPermissionCollection, and obeys serialization
+   * of JDK.
+   *
+   * @author Eric Blake (ebb9@email.byu.edu)
+   */
+  private static final class AllPermissionCollection extends PermissionCollection
+  {
+    /**
+     * Compatible with JDK 1.1+.
+     */
+    private static final long serialVersionUID = -4023755556366636806L;
+
+    /**
+     * Whether an AllPermission has been added to the collection.
+     *
+     * @serial if all permission is in the collection yet
+     */
+    private boolean all_allowed;
+
+    /**
+     * Add an AllPermission.
+     *
+     * @param perm the permission to add
+     * @throws IllegalArgumentException if perm is not an AllPermission
+     * @throws SecurityException if the collection is read-only
+     */
+    public void add(Permission perm)
+    {
+      if (isReadOnly())
+        throw new SecurityException();
+      if (! (perm instanceof AllPermission))
+        throw new IllegalArgumentException();
+      all_allowed = true;
+    }
+
+    /**
+     * Returns true if this collection implies a permission.
+     *
+     * @param perm the permission to check
+     * @return true if this collection contains an AllPermission
+     */
+    public boolean implies(Permission perm)
+    {
+      return all_allowed;
+    }
+
+    /**
+     * Returns an enumeration of the elements in the collection.
+     *
+     * @return the elements in the collection
+     */
+    public Enumeration elements()
+    {
+      return all_allowed
+        ? Collections.enumeration(Collections.singleton(new AllPermission()))
+        : EmptyEnumeration.getInstance();
+    }
+  } // class AllPermissionCollection
+} // class AllPermission