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 26package sun.jvmstat.perfdata.monitor; 27 28import java.net.*; 29import java.io.*; 30import java.util.*; 31import 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 */ 43public 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} 152