Initial revision

From-SVN: r102074

libjava/classpath/java/io/DeleteFileHelper.java

@@ -0,0 +1,109 @@
+/* DeleteFileHelper.java -- Helper class to delete files on VM exit
+   Copyright (C) 2004  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.io;
+
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.ArrayList;
+import java.util.Iterator;
+
+/**
+ * @author Guilhem Lavaux (guilhem@kaffe.org)
+ * @author Jeroen Frijters (jeroen@sumatra.nl)
+ * @author Michael Koch (konqueror@gmx.de)
+ */
+final class DeleteFileHelper extends Thread
+{
+  private static ArrayList filesToDelete;
+
+  static synchronized void add(File file)
+  {
+    if (filesToDelete == null)
+      {
+        filesToDelete = new ArrayList();
+        
+        AccessController.doPrivileged(new PrivilegedAction()
+          {
+            public Object run()
+            {
+              try
+                {
+                  Runtime.getRuntime().addShutdownHook(new DeleteFileHelper());
+                }
+              catch (IllegalStateException e)
+                {
+                  // Shutdown is already in progress, so we can't
+                  // register ours.
+                }
+                
+              return null;
+            }
+          });
+      }
+      
+    filesToDelete.add(file);
+  }
+
+  private static synchronized void deleteFiles()
+  {
+    Iterator it = filesToDelete.iterator();
+	
+    while (it.hasNext())
+      {
+	try
+	  {
+	    File file = (File) it.next();
+	    file.delete();
+	  }
+	catch (Exception e)
+	  {
+	    // Do nothing here.
+	  }
+      }
+  }
+
+  // Package-private to avoid a trampoline constructor.
+  DeleteFileHelper()
+  {
+  }
+  
+  public void run()
+  {
+    deleteFiles();
+  }
+}