106 lines
3.5 KiB
Java
106 lines
3.5 KiB
Java
/*
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* Copyright (c) 1997, 2008, Oracle and/or its affiliates. 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* 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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* 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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}
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