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    
033    package com.imagero.uio.io;
034    
035    import com.imagero.uio.RandomAccessIO;
036    
037    import java.io.IOException;
038    import java.io.OutputStream;
039    
040    /**
041     * RandomAccessOutputStream.java
042     * Can be used as bridge between RandomAccessFile and OutputStream.
043     * @author Andrey Kuznetsov
044     */
045    public class RandomAccessOutputStream extends OutputStream {
046    
047        protected RandomAccessIO ra;
048        protected long pos;
049    
050        public RandomAccessOutputStream(RandomAccessIO ra) {
051            this(ra, 0L);
052        }
053    
054        public RandomAccessOutputStream(RandomAccessIO ra, long startPos) {
055            this.ra = ra;
056            this.pos = startPos;
057        }
058    
059        protected void checkPos() throws IOException {
060            long fp = ra.getFilePointer();
061            if (fp != pos) {
062                ra.seek(pos);
063            }
064        }
065    
066        public void write(int b) throws IOException {
067            checkPos();
068            writeImpl(b);
069            pos++;
070        }
071    
072        private void writeImpl(int b) throws IOException {
073            ra.write(b);
074        }
075    
076        public void write(byte b[]) throws IOException {
077            write(b, 0, b.length);
078        }
079    
080        public void write(byte b[], int off, int len) throws IOException {
081            checkPos();
082            ra.write(b, off, len);
083            pos += len;
084        }
085    
086        public void close() throws IOException {
087            ra = null;
088        }
089    }