Jake Slack | 03928ae | 2014-05-13 18:41:56 -0700 | [diff] [blame] | 1 | // |
| 2 | // ======================================================================== |
| 3 | // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd. |
| 4 | // ------------------------------------------------------------------------ |
| 5 | // All rights reserved. This program and the accompanying materials |
| 6 | // are made available under the terms of the Eclipse Public License v1.0 |
| 7 | // and Apache License v2.0 which accompanies this distribution. |
| 8 | // |
| 9 | // The Eclipse Public License is available at |
| 10 | // http://www.eclipse.org/legal/epl-v10.html |
| 11 | // |
| 12 | // The Apache License v2.0 is available at |
| 13 | // http://www.opensource.org/licenses/apache2.0.php |
| 14 | // |
| 15 | // You may elect to redistribute this code under either of these licenses. |
| 16 | // ======================================================================== |
| 17 | // |
| 18 | |
| 19 | package org.eclipse.jetty.io.nio; |
| 20 | |
| 21 | import java.io.File; |
| 22 | import java.io.FileNotFoundException; |
| 23 | import java.io.IOException; |
| 24 | import java.io.RandomAccessFile; |
| 25 | import java.nio.channels.FileChannel; |
| 26 | import java.nio.channels.WritableByteChannel; |
| 27 | |
| 28 | import org.eclipse.jetty.io.AbstractBuffer; |
| 29 | import org.eclipse.jetty.io.Buffer; |
| 30 | |
| 31 | public class RandomAccessFileBuffer extends AbstractBuffer implements Buffer |
| 32 | { |
| 33 | final RandomAccessFile _file; |
| 34 | final FileChannel _channel; |
| 35 | final int _capacity; |
| 36 | |
| 37 | public RandomAccessFileBuffer(File file) |
| 38 | throws FileNotFoundException |
| 39 | { |
| 40 | super(READWRITE,true); |
| 41 | assert file.length()<=Integer.MAX_VALUE; |
| 42 | _file = new RandomAccessFile(file,"rw"); |
| 43 | _channel=_file.getChannel(); |
| 44 | _capacity=Integer.MAX_VALUE; |
| 45 | setGetIndex(0); |
| 46 | setPutIndex((int)file.length()); |
| 47 | } |
| 48 | |
| 49 | public RandomAccessFileBuffer(File file,int capacity) |
| 50 | throws FileNotFoundException |
| 51 | { |
| 52 | super(READWRITE,true); |
| 53 | assert capacity>=file.length(); |
| 54 | assert file.length()<=Integer.MAX_VALUE; |
| 55 | _capacity=capacity; |
| 56 | _file = new RandomAccessFile(file,"rw"); |
| 57 | _channel=_file.getChannel(); |
| 58 | setGetIndex(0); |
| 59 | setPutIndex((int)file.length()); |
| 60 | } |
| 61 | |
| 62 | public RandomAccessFileBuffer(File file,int capacity,int access) |
| 63 | throws FileNotFoundException |
| 64 | { |
| 65 | super(access,true); |
| 66 | assert capacity>=file.length(); |
| 67 | assert file.length()<=Integer.MAX_VALUE; |
| 68 | _capacity=capacity; |
| 69 | _file = new RandomAccessFile(file,access==READWRITE?"rw":"r"); |
| 70 | _channel=_file.getChannel(); |
| 71 | setGetIndex(0); |
| 72 | setPutIndex((int)file.length()); |
| 73 | } |
| 74 | |
| 75 | public byte[] array() |
| 76 | { |
| 77 | return null; |
| 78 | } |
| 79 | |
| 80 | public int capacity() |
| 81 | { |
| 82 | return _capacity; |
| 83 | } |
| 84 | |
| 85 | @Override |
| 86 | public void clear() |
| 87 | { |
| 88 | try |
| 89 | { |
| 90 | synchronized (_file) |
| 91 | { |
| 92 | super.clear(); |
| 93 | _file.setLength(0); |
| 94 | } |
| 95 | } |
| 96 | catch(Exception e) |
| 97 | { |
| 98 | throw new RuntimeException(e); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | |
| 103 | @Override |
| 104 | public byte peek() |
| 105 | { |
| 106 | synchronized (_file) |
| 107 | { |
| 108 | try |
| 109 | { |
| 110 | if (_get!=_file.getFilePointer()) |
| 111 | _file.seek(_get); |
| 112 | return _file.readByte(); |
| 113 | } |
| 114 | catch(Exception e) |
| 115 | { |
| 116 | throw new RuntimeException(e); |
| 117 | } |
| 118 | } |
| 119 | } |
| 120 | |
| 121 | public byte peek(int index) |
| 122 | { |
| 123 | synchronized (_file) |
| 124 | { |
| 125 | try |
| 126 | { |
| 127 | _file.seek(index); |
| 128 | return _file.readByte(); |
| 129 | } |
| 130 | catch(Exception e) |
| 131 | { |
| 132 | throw new RuntimeException(e); |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | public int peek(int index, byte[] b, int offset, int length) |
| 138 | { |
| 139 | synchronized (_file) |
| 140 | { |
| 141 | try |
| 142 | { |
| 143 | _file.seek(index); |
| 144 | return _file.read(b,offset,length); |
| 145 | } |
| 146 | catch(Exception e) |
| 147 | { |
| 148 | throw new RuntimeException(e); |
| 149 | } |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | public void poke(int index, byte b) |
| 154 | { |
| 155 | synchronized (_file) |
| 156 | { |
| 157 | try |
| 158 | { |
| 159 | _file.seek(index); |
| 160 | _file.writeByte(b); |
| 161 | } |
| 162 | catch(Exception e) |
| 163 | { |
| 164 | throw new RuntimeException(e); |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | @Override |
| 170 | public int poke(int index, byte[] b, int offset, int length) |
| 171 | { |
| 172 | synchronized (_file) |
| 173 | { |
| 174 | try |
| 175 | { |
| 176 | _file.seek(index); |
| 177 | _file.write(b,offset,length); |
| 178 | return length; |
| 179 | } |
| 180 | catch(Exception e) |
| 181 | { |
| 182 | throw new RuntimeException(e); |
| 183 | } |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | public int writeTo(WritableByteChannel channel,int index, int length) |
| 188 | throws IOException |
| 189 | { |
| 190 | synchronized (_file) |
| 191 | { |
| 192 | return (int)_channel.transferTo(index,length,channel); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | } |