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    1   /*
    2    * Copyright (c) 1995, 2000, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package sun.misc;
   27   
   28   /**
   29    * MessageUtils: miscellaneous utilities for handling error and status
   30    * properties and messages.
   31    *
   32    * @author Herb Jellinek
   33    */
   34   
   35   public class MessageUtils {
   36       // can instantiate it for to allow less verbose use - via instance
   37       // instead of classname
   38   
   39       public MessageUtils() { }
   40   
   41       public static String subst(String patt, String arg) {
   42           String args[] = { arg };
   43           return subst(patt, args);
   44       }
   45   
   46       public static String subst(String patt, String arg1, String arg2) {
   47           String args[] = { arg1, arg2 };
   48           return subst(patt, args);
   49       }
   50   
   51       public static String subst(String patt, String arg1, String arg2,
   52                                  String arg3) {
   53           String args[] = { arg1, arg2, arg3 };
   54           return subst(patt, args);
   55       }
   56   
   57       public static String subst(String patt, String args[]) {
   58           StringBuffer result = new StringBuffer();
   59           int len = patt.length();
   60           for (int i = 0; i >= 0 && i < len; i++) {
   61               char ch = patt.charAt(i);
   62               if (ch == '%') {
   63                   if (i != len) {
   64                       int index = Character.digit(patt.charAt(i + 1), 10);
   65                       if (index == -1) {
   66                           result.append(patt.charAt(i + 1));
   67                           i++;
   68                       } else if (index < args.length) {
   69                           result.append(args[index]);
   70                           i++;
   71                       }
   72                   }
   73               } else {
   74                   result.append(ch);
   75               }
   76           }
   77           return result.toString();
   78       }
   79   
   80       public static String substProp(String propName, String arg) {
   81           return subst(System.getProperty(propName), arg);
   82       }
   83   
   84       public static String substProp(String propName, String arg1, String arg2) {
   85           return subst(System.getProperty(propName), arg1, arg2);
   86       }
   87   
   88       public static String substProp(String propName, String arg1, String arg2,
   89                                      String arg3) {
   90           return subst(System.getProperty(propName), arg1, arg2, arg3);
   91       }
   92   
   93       /**
   94        *  Print a message directly to stderr, bypassing all the
   95        *  character conversion methods.
   96        *  @param msg   message to print
   97        */
   98       public static native void toStderr(String msg);
   99   
  100       /**
  101        *  Print a message directly to stdout, bypassing all the
  102        *  character conversion methods.
  103        *  @param msg   message to print
  104        */
  105       public static native void toStdout(String msg);
  106   
  107   
  108       // Short forms of the above
  109   
  110       public static void err(String s) {
  111           toStderr(s + "\n");
  112       }
  113   
  114       public static void out(String s) {
  115           toStdout(s + "\n");
  116       }
  117   
  118       // Print a stack trace to stderr
  119       //
  120       public static void where() {
  121           Throwable t = new Throwable();
  122           StackTraceElement[] es = t.getStackTrace();
  123           for (int i = 1; i < es.length; i++)
  124               toStderr("\t" + es[i].toString() + "\n");
  125       }
  126   
  127   }

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