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         StringBuilder result = new StringBuilder();
  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 }