1 /*
   2  * Copyright (c) 2004, 2010, 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.tools.jstat;
  27 
  28 import java.util.*;
  29 import java.net.*;
  30 import java.io.*;
  31 
  32 /**
  33  * A class for listing the available options in the jstat_options file.
  34  *
  35  * @author Brian Doherty
  36  * @since 1.5
  37  */
  38 public class OptionLister {
  39     private static final boolean debug = false;
  40     private List<URL> sources;
  41 
  42     public OptionLister(List<URL> sources) {
  43         this.sources = sources;
  44     }
  45 
  46     public void print(PrintStream ps) {
  47         Comparator<OptionFormat> c = new Comparator<OptionFormat>() {
  48                public int compare(OptionFormat o1, OptionFormat o2) {
  49                    OptionFormat of1 = o1;
  50                    OptionFormat of2 = o2;
  51                    return (of1.getName().compareTo(of2.getName()));
  52                }
  53         };
  54 
  55         Set<OptionFormat> options = new TreeSet<OptionFormat>(c);
  56 
  57         for (URL u : sources) {
  58             try {
  59                 Reader r = new BufferedReader(
  60                         new InputStreamReader(u.openStream()));
  61                 Set<OptionFormat> s = new Parser(r).parseOptions();
  62                 options.addAll(s);
  63             } catch (IOException e) {
  64                 if (debug) {
  65                     System.err.println(e.getMessage());
  66                     e.printStackTrace();
  67                 }
  68             } catch (ParserException e) {
  69                 // Exception in parsing the options file.
  70                 System.err.println(u + ": " + e.getMessage());
  71                 System.err.println("Parsing of " + u + " aborted");
  72             }
  73         }
  74 
  75         for ( OptionFormat of : options) {
  76             if (of.getName().compareTo("timestamp") == 0) {
  77               // ignore the special timestamp OptionFormat.
  78               continue;
  79             }
  80             ps.println("-" + of.getName());
  81         }
  82     }
  83 }