gcc/libjava/java/lang/System.java

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1999-04-07 22:42:40 +08:00
// 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;
}