001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: * The Original Software is NetBeans. The Initial Developer of the Original
026: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
027: * Microsystems, Inc. All Rights Reserved.
028: *
029: * If you wish your version of this file to be governed by only the CDDL
030: * or only the GPL Version 2, indicate your decision by adding
031: * "[Contributor] elects to include this software in this distribution
032: * under the [CDDL or GPL Version 2] license." If you do not indicate a
033: * single choice of license, a recipient has the option to distribute
034: * your version of this file under either the CDDL, the GPL Version 2 or
035: * to extend the choice of license to its licensees as provided above.
036: * However, if you add GPL Version 2 code and therefore, elected the GPL
037: * Version 2 license, then the option applies only if the new code is
038: * made subject to such option by the copyright holder.
039: */
040:
041: package org.netbeans.lib.profiler.heap;
042:
043: import java.io.File;
044: import java.io.FileInputStream;
045: import java.io.IOException;
046: import java.nio.MappedByteBuffer;
047: import java.nio.channels.FileChannel;
048:
049: /**
050: *
051: * @author Tomas Hurka
052: */
053: class HprofLongMappedByteBuffer extends HprofByteBuffer {
054: //~ Static fields/initializers -----------------------------------------------------------------------------------------------
055:
056: private static int BUFFER_SIZE_BITS = 30;
057: private static long BUFFER_SIZE = 1L << BUFFER_SIZE_BITS;
058: private static int BUFFER_SIZE_MASK = (int) ((BUFFER_SIZE) - 1);
059: private static int BUFFER_EXT = 32 * 1024;
060:
061: //~ Instance fields ----------------------------------------------------------------------------------------------------------
062:
063: private MappedByteBuffer[] dumpBuffer;
064:
065: //~ Constructors -------------------------------------------------------------------------------------------------------------
066:
067: HprofLongMappedByteBuffer(File dumpFile) throws IOException {
068: FileInputStream fis = new FileInputStream(dumpFile);
069: FileChannel channel = fis.getChannel();
070: length = channel.size();
071: dumpBuffer = new MappedByteBuffer[(int) (((length + BUFFER_SIZE) - 1) / BUFFER_SIZE)];
072:
073: for (int i = 0; i < dumpBuffer.length; i++) {
074: long position = i * BUFFER_SIZE;
075: long size = Math.min(BUFFER_SIZE + BUFFER_EXT, length
076: - position);
077: dumpBuffer[i] = channel.map(FileChannel.MapMode.READ_ONLY,
078: position, size);
079: }
080:
081: channel.close();
082: readHeader();
083: }
084:
085: //~ Methods ------------------------------------------------------------------------------------------------------------------
086:
087: char getChar(long index) {
088: return dumpBuffer[getBufferIndex(index)]
089: .getChar(getBufferOffset(index));
090: }
091:
092: double getDouble(long index) {
093: return dumpBuffer[getBufferIndex(index)]
094: .getDouble(getBufferOffset(index));
095: }
096:
097: float getFloat(long index) {
098: return dumpBuffer[getBufferIndex(index)]
099: .getFloat(getBufferOffset(index));
100: }
101:
102: int getInt(long index) {
103: return dumpBuffer[getBufferIndex(index)]
104: .getInt(getBufferOffset(index));
105: }
106:
107: long getLong(long index) {
108: return dumpBuffer[getBufferIndex(index)]
109: .getLong(getBufferOffset(index));
110: }
111:
112: short getShort(long index) {
113: return dumpBuffer[getBufferIndex(index)]
114: .getShort(getBufferOffset(index));
115: }
116:
117: // delegate to MappedByteBuffer
118: byte get(long index) {
119: return dumpBuffer[getBufferIndex(index)]
120: .get(getBufferOffset(index));
121: }
122:
123: synchronized void get(long position, byte[] chars) {
124: MappedByteBuffer buffer = dumpBuffer[getBufferIndex(position)];
125: buffer.position(getBufferOffset(position));
126: buffer.get(chars);
127: }
128:
129: private int getBufferIndex(long index) {
130: return (int) (index >> BUFFER_SIZE_BITS);
131: }
132:
133: private int getBufferOffset(long index) {
134: return (int) (index & BUFFER_SIZE_MASK);
135: }
136: }
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