001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.tools.imagecollection.processor;
031
032import java.io.ByteArrayOutputStream;
033import java.io.IOException;
034import java.net.URI;
035
036import org.apache.hadoop.conf.Configuration;
037import org.apache.hadoop.fs.FileSystem;
038import org.apache.hadoop.fs.LocalFileSystem;
039import org.apache.hadoop.fs.Path;
040import org.apache.hadoop.io.BytesWritable;
041import org.apache.hadoop.io.Text;
042import org.openimaj.hadoop.sequencefile.SequenceFileUtility;
043import org.openimaj.hadoop.sequencefile.TextBytesSequenceFileUtility;
044import org.openimaj.image.Image;
045import org.openimaj.image.ImageUtilities;
046import org.openimaj.tools.imagecollection.collection.ImageCollectionEntry;
047
048public class SequenceFileProcessor<T extends Image<?, T>> extends ImageCollectionProcessor<T> {
049        
050        String sequenceFile = "output.seq";
051        boolean force = true;
052        private TextBytesSequenceFileUtility utility;
053        private int seen = 0;
054
055        public SequenceFileProcessor(String output, boolean force) {
056                this.sequenceFile = output;
057                this.force = force;
058        }
059
060        public static FileSystem getFileSystem(URI uri) throws IOException {
061                Configuration config = new Configuration();
062                FileSystem fs = FileSystem.get(uri, config);
063                if (fs instanceof LocalFileSystem) fs = ((LocalFileSystem)fs).getRaw();
064                return fs;
065        }
066        
067        @Override
068        public void start() throws IOException{
069                if(force)
070                {
071                        URI outuri = SequenceFileUtility.convertToURI(sequenceFile);
072                        FileSystem fs = getFileSystem(outuri);
073                        fs.delete(new Path(outuri.toString()), true);
074                }
075                
076                utility = new TextBytesSequenceFileUtility(sequenceFile, false);
077        }
078
079        @Override
080        public String process(ImageCollectionEntry<T> image) throws Exception {
081                ByteArrayOutputStream bos = new ByteArrayOutputStream();
082                ImageUtilities.write(image.image, "png", bos);
083                BytesWritable bw = new BytesWritable(bos.toByteArray());
084                String imageName = "" + this.seen ;
085                utility.appendData(new Text(imageName), bw);
086                this.seen ++;
087                return imageName;
088        }
089        
090        @Override
091        public void end() throws IOException{
092                utility.close();
093        }
094
095}