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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /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