1 /* |
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2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 |
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27 /* |
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28 * The Original Code is HAT. The Initial Developer of the |
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29 * Original Code is Bill Foote, with contributions from others |
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30 * at JavaSoft/Sun. |
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31 */ |
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32 |
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33 package com.sun.tools.hat.internal.model; |
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34 |
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35 import java.io.File; |
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36 import java.io.FileInputStream; |
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37 import java.io.InputStreamReader; |
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38 import java.io.Reader; |
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39 import java.io.BufferedReader; |
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40 import java.io.IOException; |
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41 |
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42 import java.util.Hashtable; |
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43 |
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44 /** |
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45 * This represents a set of data members that should be excluded from the |
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46 * reachable objects query. |
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47 * This is useful to exclude observers from the |
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48 * transitive closure of objects reachable from a given object, allowing |
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49 * some kind of real determination of the "size" of that object. |
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50 * |
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51 * @author Bill Foote |
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52 */ |
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53 public class ReachableExcludesImpl implements ReachableExcludes { |
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54 |
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55 private File excludesFile; |
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56 private long lastModified; |
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57 private Hashtable<String, String> methods; // Used as a bag |
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58 |
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59 /** |
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60 * Create a new ReachableExcludesImpl over the given file. The file will be |
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61 * re-read whenever the timestamp changes. |
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62 */ |
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63 public ReachableExcludesImpl(File excludesFile) { |
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64 this.excludesFile = excludesFile; |
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65 readFile(); |
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66 } |
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67 |
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68 private void readFileIfNeeded() { |
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69 if (excludesFile.lastModified() != lastModified) { |
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70 synchronized(this) { |
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71 if (excludesFile.lastModified() != lastModified) { |
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72 readFile(); |
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73 } |
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74 } |
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75 } |
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76 } |
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77 |
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78 private void readFile() { |
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79 long lm = excludesFile.lastModified(); |
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80 Hashtable<String, String> m = new Hashtable<String, String>(); |
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81 |
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82 try { |
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83 BufferedReader r = new BufferedReader(new InputStreamReader( |
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84 new FileInputStream(excludesFile))); |
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85 |
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86 String method; |
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87 while ((method = r.readLine()) != null) { |
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88 m.put(method, method); |
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89 } |
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90 lastModified = lm; |
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91 methods = m; // We want this to be atomic |
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92 } catch (IOException ex) { |
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93 System.out.println("Error reading " + excludesFile + ": " + ex); |
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94 } |
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95 } |
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96 |
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97 /** |
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98 * @return true iff the given field is on the histlist of excluded |
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99 * fields. |
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100 */ |
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101 public boolean isExcluded(String fieldName) { |
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102 readFileIfNeeded(); |
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103 return methods.get(fieldName) != null; |
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104 } |
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105 } |
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