// System.java - System-specific info.

/* Copyright (C) 1998, 1999  Cygnus Solutions

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

package java.lang;

import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.PrintStream;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.util.Properties;

/**
 * @author Tom Tromey <tromey@cygnus.com>
 * @date August 27, 1998 
 */

/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
 * "The Java Language Specification", ISBN 0-201-63451-1
 * plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
 * Status: 1.1.  Some 1.2 methods missing.  Properties code not fully
 * implemented.
 */

public final class System
{
  public static native void arraycopy (Object src, int srcOffset,
				       Object dst, int dstOffset,
				       int count);

  public static native long currentTimeMillis ();

  public static void exit (int status)
  {
    Runtime.getRuntime().exit(status);
  }

  public static void gc ()
  {
    Runtime.getRuntime().gc();
  }

  // Marked deprecated in 1.1.  We implement what the JCL book says.
  public static String getenv (String name)
  {
    throw new Error ();
  }

  private static native void init_properties ();

  public static Properties getProperties ()
  {
    if (secman != null)
      secman.checkPropertiesAccess();
    init_properties ();
    return properties;
  }

  public static String getProperty (String property)
  {
    if (secman != null)
      secman.checkPropertyAccess(property);
    init_properties ();
    return properties.getProperty(property);
  }

  public static String getProperty (String property, String defval)
  {
    if (secman != null)
      secman.checkPropertyAccess(property, defval);
    init_properties ();
    return properties.getProperty(property, defval);
  }

  public static SecurityManager getSecurityManager ()
  {
    return secman;
  }

  public static native int identityHashCode (Object obj);

  public static void load (String pathname)
  {
    Runtime.getRuntime().load(pathname);
  }

  public static void loadLibrary (String libname)
  {
    Runtime.getRuntime().loadLibrary(libname);
  }

  public static void runFinalization ()
  {
    Runtime.getRuntime().runFinalization();
  }

  // Marked as deprecated in 1.2.
  public static void runFinalizersOnExit (boolean run)
  {
    Runtime.getRuntime().runFinalizersOnExit(run);
  }

  private static void checkSetIO ()
  {
    // In 1.1, we are supposed to call checkExec, but the argument is
    // not specified.  In 1.2, we are supposed to use checkPermission,
    // which doesn't exist in 1.1.
    if (secman != null)
      secman.checkExec("");
  }

  public static native void setErr (PrintStream newErr);
  public static native void setIn (InputStream newIn);
  public static native void setOut (PrintStream newOut);

  public static void setProperties (Properties props)
  {
    if (secman != null)
      secman.checkPropertiesAccess();
    // We might not have initialized yet.
    prop_init = true;
    properties = props;
  }

  // TODO 1.2.
  // public static String setProperty (String key, String value);

  // TODO 1.2.
  // public static String mapLibraryName (String libname);

  public static void setSecurityManager (SecurityManager s)
  {
    if (secman != null)
      throw new SecurityException ();
    secman = s;
  }

  // Public data.
  public static final InputStream in = new BufferedInputStream (new FileInputStream (FileDescriptor.in));

  public static final PrintStream out = new PrintStream (new BufferedOutputStream (new FileOutputStream (FileDescriptor.out)), true);

  public static final PrintStream err = new PrintStream (new BufferedOutputStream (new FileOutputStream (FileDescriptor.err)), true);

  // Don't allow System objects to be made.
  private System ()
  {
  }

  // Private data.
  private static SecurityManager secman = null;
  private static Properties properties = null;
  // This boolean is only required for 1.1 and earlier.  After 1.1, a
  // null properties should always be re-initialized.
  private static boolean prop_init = false;
}
