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.RandomAccessIO;
035    import com.imagero.uio.RandomAccessInput;
036    import com.imagero.uio.io.IOutils;
037    
038    import java.io.IOException;
039    import java.io.EOFException;
040    
041    /**
042     * Date: 05.01.2008
043     *
044     * @author Andrey Kuznetsov
045     */
046    public class RandomAccessIOContent extends Content {
047        private RandomAccessIO rio;
048    
049        public RandomAccessIOContent(RandomAccessIO rio) throws IOException {
050            this.rio = rio;
051        }
052    
053        public int load(long offset, int bpos, byte[] b) throws IOException {
054            long max = rio.length() - offset;
055            int len = (int) Math.min(max, b.length - bpos);
056            if (len > 0) {
057                rio.seek(offset);
058                rio.readFully(b, bpos, len);
059                return len;
060            }
061            throw new EOFException();
062    //            return 0;
063        }
064    
065        public boolean canReload() {
066            return true;
067        }
068    
069        public void close() {
070            IOutils.closeStream((RandomAccessInput) rio);
071            rio = null;
072        }
073    
074        public boolean writable() {
075            return true;
076        }
077    
078        public void save(long offset, int bpos, byte[] buffer, int length) throws IOException {
079            rio.seek(offset);
080            try {
081                rio.write(buffer, bpos, length);
082            } catch (IndexOutOfBoundsException ex) {
083                ex.printStackTrace();
084            }
085        }
086    
087        public long length() throws IOException {
088            return rio.length();
089        }
090    
091        protected void finalize() throws Throwable {
092            super.finalize();
093            rio = null;
094        }
095    }