author | xdono |
Wed, 02 Jul 2008 12:55:45 -0700 | |
changeset 715 | f16baef3a20e |
parent 468 | 642c8c0be52e |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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/* |
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* The Original Code is HAT. The Initial Developer of the |
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* Original Code is Bill Foote, with contributions from others |
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468
642c8c0be52e
6695553: Cleanup GPLv2+SPL legal notices in hat sources
ohair
parents:
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diff
changeset
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* at JavaSoft/Sun. |
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*/ |
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package com.sun.tools.hat.internal.model; |
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import java.io.File; |
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import java.io.FileInputStream; |
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import java.io.InputStreamReader; |
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import java.io.Reader; |
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import java.io.BufferedReader; |
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import java.io.IOException; |
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import java.util.Hashtable; |
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/** |
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* This represents a set of data members that should be excluded from the |
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* reachable objects query. |
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* This is useful to exclude observers from the |
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* transitive closure of objects reachable from a given object, allowing |
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* some kind of real determination of the "size" of that object. |
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* |
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* @author Bill Foote |
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*/ |
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public class ReachableExcludesImpl implements ReachableExcludes { |
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private File excludesFile; |
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private long lastModified; |
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private Hashtable methods; // Hashtable<String, String>, used as a bag |
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/** |
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* Create a new ReachableExcludesImpl over the given file. The file will be |
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* re-read whenever the timestamp changes. |
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*/ |
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public ReachableExcludesImpl(File excludesFile) { |
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this.excludesFile = excludesFile; |
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readFile(); |
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} |
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private void readFileIfNeeded() { |
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if (excludesFile.lastModified() != lastModified) { |
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synchronized(this) { |
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if (excludesFile.lastModified() != lastModified) { |
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readFile(); |
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} |
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} |
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} |
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} |
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private void readFile() { |
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long lm = excludesFile.lastModified(); |
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Hashtable<String, String> m = new Hashtable<String, String>(); |
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try { |
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BufferedReader r = new BufferedReader(new InputStreamReader( |
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new FileInputStream(excludesFile))); |
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String method; |
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while ((method = r.readLine()) != null) { |
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m.put(method, method); |
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} |
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lastModified = lm; |
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methods = m; // We want this to be atomic |
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} catch (IOException ex) { |
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System.out.println("Error reading " + excludesFile + ": " + ex); |
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} |
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} |
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/** |
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* @return true iff the given field is on the histlist of excluded |
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* fields. |
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*/ |
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public boolean isExcluded(String fieldName) { |
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readFileIfNeeded(); |
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return methods.get(fieldName) != null; |
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} |
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} |