/**
    * Copyright (c) 2011, The University of Southampton and the individual contributors.
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *
    *   * 	Redistributions of source code must retain the above copyright notice,
    * 	this list of conditions and the following disclaimer.
   *
   *   *	Redistributions in binary form must reproduce the above copyright notice,
   * 	this list of conditions and the following disclaimer in the documentation
   * 	and/or other materials provided with the distribution.
   *
   *   *	Neither the name of the University of Southampton nor the names of its
   * 	contributors may be used to endorse or promote products derived from this
   * 	software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package org.openimaj.experiment.gmm.retrieval;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.vfs2.FileObject;
  import org.apache.commons.vfs2.FileSystemException;
  import org.apache.commons.vfs2.FileSystemManager;
  import org.apache.commons.vfs2.VFS;
  import org.openimaj.data.dataset.ReadableListDataset;
  import org.openimaj.data.identity.Identifiable;
  import org.openimaj.io.ObjectReader;
  
  /**
   *
   * @param <IMAGE>
   * @author Sina Samangooei (ss@ecs.soton.ac.uk)
   */
  public class UKBenchListDataset<IMAGE> extends ReadableListDataset<IMAGE, FileObject> implements Identifiable{
  	private int object;
  	private List<String> ids;
  	private FileObject base;
  	
  	/**
  	 * @param path
  	 * @param reader
  	 * @param object
  	 */
  	public UKBenchListDataset(String path, ObjectReader<IMAGE, FileObject> reader, int object) {
  		super(reader);
  		this.object = object;
  		this.ids = heldIDs();
  		FileSystemManager fsManager;
  		try {
  			fsManager = VFS.getManager();
  			this.base = fsManager.resolveFile(path);
  		} catch (FileSystemException e) {
  			throw new RuntimeException(e);
  		}
  	}
  	@Override
  	public IMAGE getInstance(int index) {
  		FileObject fo = null; 
  		try {
  			fo = createFileObject(this.ids.get(index));
  			return this.reader.read(fo);
  		} catch (IOException e) {
  			throw new RuntimeException(e);
  		} finally {
  			if(fo!=null){
  				try {
  					fo.close();
  				} catch (FileSystemException e) {
  					throw new RuntimeException(e);
  				}
  			}
  		}
  	}
  
  	private FileObject createFileObject(String string) {
  		try {
  			FileObject child = base.getChild(string);
  			return child;
  		} catch (FileSystemException e) {
  			throw new RuntimeException(e);
  		}
  	}
  	@Override
  	public int numInstances() {
 		return  4;
 	}
 
 	@Override
 	public String getID() {
 		List<String> ids = heldIDs();
 		return String.format("UKBench{%s}",ids.toString());
 	}
 	private List<String> heldIDs() {
 		List<String> ids = new ArrayList<String>();
 		ids.add(String.format("ukbench%05d.jpg",object * 4 + 0));
 		ids.add(String.format("ukbench%05d.jpg",object * 4 + 1));
 		ids.add(String.format("ukbench%05d.jpg",object * 4 + 2));
 		ids.add(String.format("ukbench%05d.jpg",object * 4 + 3));
 		return ids;
 	}
 	/**
 	 * @return the objects this group represents
 	 */
 	public int getObject() {
 		return object;
 	}
 	
 	
 
 }