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 finding a specific special option in the jstat_options file.

    34  *

    35  * @author Brian Doherty

    36  * @since 1.5

    37  */

    38 public class OptionFinder {

    39 

    40     private static final boolean debug = false;

    41 

    42     List<URL> optionsSources;

    43 

    44     public OptionFinder(List<URL> optionsSources) {

    45         this.optionsSources = optionsSources;

    46     }

    47 

    48     public OptionFormat getOptionFormat(String option, boolean useTimestamp) {

    49         OptionFormat of = getOptionFormat(option, optionsSources);

    50         OptionFormat tof = null;

    51         if ((of != null) && (useTimestamp)) {

    52             // prepend the timestamp column as first column

    53             tof = getOptionFormat("timestamp", optionsSources);

    54             if (tof != null) {

    55                 ColumnFormat cf = (ColumnFormat)tof.getSubFormat(0);

    56                 of.insertSubFormat(0, cf);

    57             }

    58         }

    59         return of;

    60     }

    61 

    62     protected OptionFormat getOptionFormat(String option, List<URL> sources) {

    63         OptionFormat of = null;

    64         for (URL u : sources) {

    65             try {

    66                 Reader r = new BufferedReader(

    67                         new InputStreamReader(u.openStream()));

    68                 of = new Parser(r).parse(option);

    69                 if (of != null)

    70                     break;

    71             } catch (IOException e) {

    72                 if (debug) {

    73                     System.err.println("Error processing " + u

    74                                        + " : " + e.getMessage());

    75                     e.printStackTrace();

    76                 }

    77             } catch (ParserException e) {

    78                 // Exception in parsing the options file.

    79                 System.err.println(u + ": " + e.getMessage());

    80                 System.err.println("Parsing of " + u + " aborted");

    81             }

    82         }

    83         return of;

    84     }

    85 }