source: branches/libc-0.6/src/gcc/libjava/java/security/Security.java@ 2442

/* Security.java --- Java base security class implmentation
   Copyright (C) 1999, 2001, 2002, 2003 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., 59 Temple Place, Suite 330, Boston, MA
02111-1307 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.File;
import java.io.InputStream;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.net.URL;
import java.security.Provider;
import java.util.Vector;
import java.util.Enumeration;
import java.util.Properties;

/**
   Security class that loads the Providers and provides an 
   interface to security properties.

   @author Mark Benvenuto <[email protected]>
 */

public final class Security extends Object
{
  private static Vector providers = new Vector();
  private static Properties secprops = new Properties();

  static
  {
    String base = System.getProperty("gnu.classpath.home.url");
    String vendor = System.getProperty("gnu.classpath.vm.shortname");

    // Try VM specific security file
    boolean loaded = loadProviders(base, vendor);

    // Append classpath standard provider if possible
    if (!loadProviders(base, "classpath") && !loaded && providers.size() == 0)
      {
        // No providers found and both security files failed to load properly.
        System.err.println
                ("WARNING: could not properly read security provider files:");
        System.err.println
                ("         " + base + "/security/" + vendor + ".security");
        System.err.println
                ("         " + base + "/security/" + "classpath" + ".security");
        System.err.println
                ("         Falling back to standard GNU security provider");
        providers.addElement(new gnu.java.security.provider.Gnu());
      }
  }

  // This class can't be instantiated.
  private Security ()
  {
  }

  /**
   * Tries to load the vender specific security providers from the given
   * base URL. Returns true if the resource could be read and completely
   * parsed successfully, false otherwise.
   */
  private static boolean loadProviders(String baseUrl, String vendor)
  {
    if (baseUrl == null || vendor == null)
      return false;

    boolean result = true;
    String secfilestr = baseUrl + "/security/" + vendor + ".security";
    try
      {
        InputStream fin = new URL(secfilestr).openStream();
        secprops.load(fin);

        int i = 1;
        String name;

        while ((name = secprops.getProperty("security.provider." + i)) !=
               null)
          {
            Exception exception = null;

            try
              {