101 lines
3.5 KiB
Java
101 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.parser;
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import java.io.*;
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import com.sun.tools.hat.internal.model.*;
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/**
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* Abstract base class for reading object dump files. A reader need not be
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* thread-safe.
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*
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* @author Bill Foote
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*/
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public abstract class Reader {
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protected PositionDataInputStream in;
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protected Reader(PositionDataInputStream in) {
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this.in = in;
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}
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/**
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* Read a snapshot from a data input stream. It is assumed that the magic
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* number has already been read.
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*/
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abstract public Snapshot read() throws IOException;
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/**
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* Read a snapshot from a file.
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*
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* @param heapFile The name of a file containing a heap dump
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* @param callStack If true, read the call stack of allocaation sites
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*/
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public static Snapshot readFile(String heapFile, boolean callStack,
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int debugLevel)
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throws IOException {
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int dumpNumber = 1;
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int pos = heapFile.lastIndexOf('#');
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if (pos > -1) {
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String num = heapFile.substring(pos+1, heapFile.length());
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try {
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dumpNumber = Integer.parseInt(num, 10);
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} catch (java.lang.NumberFormatException ex) {
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String msg = "In file name \"" + heapFile
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+ "\", a dump number was "
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+ "expected after the :, but \""
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+ num + "\" was found instead.";
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System.err.println(msg);
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throw new IOException(msg);
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}
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heapFile = heapFile.substring(0, pos);
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}
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PositionDataInputStream in = new PositionDataInputStream(
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new BufferedInputStream(new FileInputStream(heapFile)));
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try {
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int i = in.readInt();
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if (i == HprofReader.MAGIC_NUMBER) {
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Reader r
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= new HprofReader(heapFile, in, dumpNumber,
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callStack, debugLevel);
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return r.read();
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} else {
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throw new IOException("Unrecognized magic number: " + i);
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}
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} finally {
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in.close();
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}
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}
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}
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