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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/GuardedObject.java
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+/* GuardedObject.java -- An object protected by a Guard
+ Copyright (C) 1998, 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 java.io.IOException;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+
+/**
+ * This class is an object that is guarded by a <code>Guard</code> object.
+ * The object that is being guarded is retrieved by a call to the only
+ * method in this class - <code>getObject</code>. That method returns the
+ * guarded <code>Object</code> after first checking with the
+ * <code>Guard</code>. If the <code>Guard</code> disallows access, an
+ * exception will be thrown.
+ *
+ * @author Aaron M. Renn (arenn@urbanophile.com)
+ * @since 1.1
+ * @status updated to 1.4
+ */
+public class GuardedObject implements Serializable
+{
+ /**
+ * Compatible with JDK 1.1+.
+ */
+ private static final long serialVersionUID = -5240450096227834308L;
+
+ /**
+ * This is the Guard that is protecting the object.
+ *
+ * @serial the guard
+ */
+ private final Guard guard;
+
+ /**
+ * This is the object that is being guarded.
+ *
+ * @serial the protected object
+ */
+ private final Object object;
+
+ /**
+ * This method initializes a new instance of <code>GuardedObject</code>
+ * that protects the specified <code>Object</code> using the specified
+ * <code>Guard</code>. A null guard means there are no restrictions on
+ * accessing the object.
+ *
+ * @param object the <code>Object</code> to guard
+ * @param guard the <code>Guard</code> that is protecting the object
+ */
+ public GuardedObject(Object object, Guard guard)
+ {
+ this.object = object;
+ this.guard = guard;
+ }
+
+ /**
+ * This method first call the <code>checkGuard</code> method on the
+ * <code>Guard</code> object protecting the guarded object. If the
+ * <code>Guard</code> disallows access, an exception is thrown, otherwise
+ * the <code>Object</code> is returned.
+ *
+ * @return The object being guarded
+ * @throws SecurityException if access is denied
+ */
+ public Object getObject()
+ {
+ if (guard != null)
+ guard.checkGuard(object);
+ return object;
+ }
+
+ /**
+ * Ensures that serialization is legal, by checking the guard.
+ *
+ * @param s the stream to write to
+ * @throws IOException if the underlying stream fails
+ */
+ private void writeObject(ObjectOutputStream s) throws IOException
+ {
+ if (guard != null)
+ guard.checkGuard(object);
+ s.defaultWriteObject();
+ }
+} // class GuardedObject