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.TmpRandomAccessFile;
035    import com.imagero.uio.io.IOutils;
036    
037    import java.io.InputStream;
038    import java.io.File;
039    import java.io.IOException;
040    
041    /**
042     * Date: 05.01.2008
043     *
044     * @author Andrey Kuznetsov
045     */
046    public class FileCachedInputStreamContent extends Content {
047        InputStream in;
048        File tmp;
049        TmpRandomAccessFile tmpRaf;
050    
051        public FileCachedInputStreamContent(InputStream in, File tmp) throws IOException {
052            this.in = in;
053            this.tmp = tmp;
054            tmpRaf = new TmpRandomAccessFile(tmp, "rw");
055        }
056    
057        public int load(long offset, int bpos, byte[] buffer) throws IOException {
058            long length = tmpRaf.length();
059            long nl = offset + buffer.length - bpos;
060            if (length < nl) {
061                tmpRaf.seek(length);
062                IOutils.copy(nl - length, in, tmpRaf);
063            }
064            tmpRaf.seek(offset);
065            tmpRaf.readFully(buffer, bpos, buffer.length - bpos);
066            return buffer.length - bpos;
067        }
068    
069        public void save(long offset, int bpos, byte[] buffer, int length) throws IOException {
070        }
071    
072        public long length() throws IOException {
073            return tmp.length() + in.available();
074        }
075    
076        public void close() {
077            IOutils.closeStream(tmpRaf);
078        }
079    
080        protected void finalize() throws Throwable {
081            super.finalize();
082            IOutils.closeStream(tmpRaf);
083            tmpRaf = null;
084        }
085    
086        public boolean canReload() {
087            return true;
088        }
089    
090        public boolean writable() {
091            return false;
092        }
093    }