1 /*

     2  * Copyright (c) 2004, 2014, 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.jvmstat.perfdata.monitor;

    27 

    28 import java.net.*;

    29 import java.io.*;

    30 import java.util.*;

    31 import java.util.regex.*;

    32 

    33 /**

    34  * Class for parsing alias files. File format is expected to follow

    35  * the following syntax:

    36  *

    37  *     alias name [alias]*

    38  *

    39  * Java style comments can occur anywhere within the file.

    40  * @author Brian Doherty

    41  * @since 1.5

    42  */

    43 public class AliasFileParser {

    44     private static final String ALIAS = "alias";

    45     // 8028357 removed old, inefficient debug logging

    46 

    47     // other variables

    48     private URL inputfile;

    49     private StreamTokenizer st;

    50     private Token currentToken;

    51 

    52     AliasFileParser(URL inputfile) {

    53         this.inputfile = inputfile;

    54     }

    55 

    56     // value class to hold StreamTokenizer token values

    57     private class Token {

    58         public String sval;

    59         public int ttype;

    60 

    61         public Token(int ttype, String sval) {

    62             this.ttype = ttype;

    63             this.sval = sval;

    64         }

    65     }

    66 

    67     /**

    68      * method to get the next token as a Token type

    69      */

    70     private void nextToken() throws IOException {

    71         st.nextToken();

    72         currentToken = new Token(st.ttype, st.sval);

    73     }

    74 

    75     /**

    76      * method to match the current Token to a specified token type and

    77      * value Throws a SyntaxException if token doesn't match.

    78      */

    79     private void match(int ttype, String token)

    80                  throws IOException, SyntaxException {

    81 

    82         if ((currentToken.ttype == ttype)

    83                 && (currentToken.sval.compareTo(token) == 0)) {

    84             nextToken();

    85         } else {

    86             throw new SyntaxException(st.lineno());

    87         }

    88     }

    89 

    90 

    91     /*

    92      * method to match the current Token to a specified token type.

    93      * Throws a SyntaxException if token doesn't match.

    94      */

    95     private void match(int ttype) throws IOException, SyntaxException {

    96         if (currentToken.ttype == ttype) {

    97             nextToken();

    98         } else {

    99             throw new SyntaxException(st.lineno());

   100         }

   101     }

   102 

   103     private void match(String token) throws IOException, SyntaxException {

   104         match(StreamTokenizer.TT_WORD, token);

   105     }

   106 

   107     /**

   108      * method to parse the given input file.

   109      */

   110     public void parse(Map<String, ArrayList<String>> map) throws SyntaxException, IOException {

   111 

   112         if (inputfile == null) {

   113             return;

   114         }

   115 

   116         BufferedReader r = new BufferedReader(

   117                 new InputStreamReader(inputfile.openStream()));

   118         st = new StreamTokenizer(r);

   119 

   120         // allow both forms of commenting styles

   121         st.slashSlashComments(true);

   122         st.slashStarComments(true);

   123         st.wordChars('_','_');

   124 

   125         nextToken();

   126 

   127         while (currentToken.ttype != StreamTokenizer.TT_EOF) {

   128             // look for the start symbol

   129             if ((currentToken.ttype != StreamTokenizer.TT_WORD)

   130                     || (currentToken.sval.compareTo(ALIAS) != 0)) {

   131                 nextToken();

   132                 continue;

   133             }

   134 

   135             match(ALIAS);

   136             String name = currentToken.sval;

   137             match(StreamTokenizer.TT_WORD);

   138 

   139             ArrayList<String> aliases = new ArrayList<String>();

   140 

   141             do {

   142                 aliases.add(currentToken.sval);

   143                 match(StreamTokenizer.TT_WORD);

   144 

   145             } while ((currentToken.ttype != StreamTokenizer.TT_EOF)

   146                      && (currentToken.sval.compareTo(ALIAS) != 0));

   147 

   148             map.put(name, aliases);

   149         }

   150     }

   151 }