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comparison agent/src/share/classes/sun/jvm/hotspot/debugger/MappedByteBufferDataSource.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002 Sun Microsystems, Inc. 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.debugger;
26
27 import java.io.*;
28 import java.nio.*;
29
30 /** Implementation of DataSource using MappedByteBuffer. This works
31 around a performance problem in JDK 1.4 where ByteBuffer's
32 operations always become virtual calls rather than being inlined.
33 Need to fix this soon. */
34
35 public class MappedByteBufferDataSource implements DataSource {
36 private MappedByteBuffer buf;
37
38 public MappedByteBufferDataSource(MappedByteBuffer buf) {
39 this.buf = buf;
40 }
41
42 public byte readByte() throws IOException { return buf.get(); }
43 public short readShort() throws IOException { return buf.getShort(); }
44 public int readInt() throws IOException { return buf.getInt(); }
45 public long readLong() throws IOException { return buf.getLong(); }
46 public int read(byte[] b) throws IOException { buf.get(b); return b.length; }
47 public void seek(long pos) throws IOException {
48 try {
49 buf.position((int) pos);
50 } catch (IllegalArgumentException e) {
51 System.err.println("Error seeking to file position 0x" + Long.toHexString(pos));
52 throw(e);
53 }
54 }
55 public long getFilePointer() throws IOException { return buf.position(); }
56 public void close() throws IOException { buf = null; }
57 }