Imported GNU Classpath 0.20

Imported GNU Classpath 0.20
       * Makefile.am (AM_CPPFLAGS): Add classpath/include.
       * java/nio/charset/spi/CharsetProvider.java: New override file.
       * java/security/Security.java: Likewise.
       * sources.am: Regenerated.
       * Makefile.in: Likewise.

From-SVN: r109831

libjava/classpath/gnu/java/nio/charset/Provider.java

@@ -1,5 +1,5 @@
 /* Provider.java -- 
-   Copyright (C) 2002, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2005, 2006 Free Software Foundation, Inc.
 
 This file is part of GNU Classpath.
 
@@ -39,6 +39,8 @@ package gnu.java.nio.charset;
 
 import java.nio.charset.Charset;
 import java.nio.charset.spi.CharsetProvider;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -47,6 +49,11 @@ import java.util.Iterator;
  * Charset provider for the required charsets.  Used by
  * {@link Charset#charsetForName} and * {@link Charset#availableCharsets}.
  *
+ * Note: This class is a privileged class, because it can be instantiated without
+ * requiring the RuntimePermission("charsetProvider"). There is a check in
+ * java.nio.charset.spi.CharsetProvider to skip the security check if the provider
+ * is an instance of this class.
+ *
  * @author Jesse Rosenstock
  * @author Robert Schuster (thebohemian@gmx.net)
  * @see Charset
@@ -55,14 +62,6 @@ public final class Provider extends CharsetProvider
 {
   private static Provider singleton;
 
-  static
-  {
-    synchronized (Provider.class)
-      {
-        singleton = null;
-      }
-  }
-
   /**
    * Map from charset name to charset canonical name. The strings
    * are all lower-case to allow case-insensitive retrieval of
@@ -232,8 +231,16 @@ public final class Provider extends CharsetProvider
 
   public static synchronized Provider provider ()
   {
+    // The default provider is safe to instantiate.
     if (singleton == null)
-      singleton = new Provider ();
+      singleton = (Provider) AccessController.doPrivileged
+	(new PrivilegedAction()
+	  {
+	    public Object run()
+	    {
+	      return new Provider();
+	    }
+	  });
     return singleton;
   }
 }