001 /*
002 * Copyright (c) Andrey Kuznetsov. All Rights Reserved.
003 *
004 * http://uio.imagero.com
005 *
006 * Redistribution and use in source and binary forms, with or without
007 * modification, are permitted provided that the following conditions are met:
008 *
009 * o Redistributions of source code must retain the above copyright notice,
010 * this list of conditions and the following disclaimer.
011 *
012 * o Redistributions in binary form must reproduce the above copyright notice,
013 * this list of conditions and the following disclaimer in the documentation
014 * and/or other materials provided with the distribution.
015 *
016 * o Neither the name of Andrey Kuznetsov nor the names of
017 * its contributors may be used to endorse or promote products derived
018 * from this software without specific prior written permission.
019 *
020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
021 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
022 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
023 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
024 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
025 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
026 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
027 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
028 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
029 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
030 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
031 */
032 package com.imagero.uio.bio.content;
033
034 import com.imagero.uio.impl.RandomAccessFileX;
035 import com.imagero.uio.io.IOutils;
036
037 import java.io.RandomAccessFile;
038 import java.io.File;
039 import java.io.IOException;
040 import java.io.EOFException;
041
042 /**
043 * Date: 05.01.2008
044 *
045 * @author Andrey Kuznetsov
046 */
047 public class RandomAccessFileContent extends Content {
048 private RandomAccessFile raf;
049
050 public RandomAccessFileContent(File f) throws IOException {
051 this(f, getMode(f));
052 }
053
054 public RandomAccessFileContent(File f, String mode) throws IOException {
055 this(new RandomAccessFileX(f, mode));
056 }
057
058 static String getMode(File f) {
059 if (!f.exists() || f.canWrite()) {
060 return "rw";
061 } else {
062 return "r";
063 }
064 }
065
066 public RandomAccessFileContent(RandomAccessFile raf) {
067 this.raf = raf;
068 }
069
070 public int load(long offset, int bpos, byte[] b) throws IOException {
071 long max = raf.length() - offset;
072 int len = (int) Math.min(max, b.length - bpos);
073 if (len > 0) {
074 raf.seek(offset);
075 raf.readFully(b, bpos, len);
076 return len;
077 }
078 throw new EOFException();
079 // return 0;
080 }
081
082 public boolean canReload() {
083 return true;
084 }
085
086 public void close() {
087 IOutils.closeStream(raf);
088 }
089
090 public boolean writable() {
091 return true;
092 }
093
094 public void save(long offset, int bpos, byte[] buffer, int length) throws IOException {
095 raf.seek(offset);
096 try {
097 raf.write(buffer, bpos, length);
098 } catch (IndexOutOfBoundsException ex) {
099 ex.printStackTrace();
100 }
101 }
102
103 public long length() throws IOException {
104 return raf.length();
105 }
106
107 protected void finalize() throws Throwable {
108 super.finalize();
109 raf = null;
110 }
111 }