code: /*******************************************************************************
   * Copyright (c) 2015 Attila Kovacs <attila[AT]sigmyne.com>.
   * All rights reserved. 
   * 
   * This file is part of crush.
   * 
   *     crush is free software: you can redistribute it and/or modify
   *     it under the terms of the GNU General Public License as published by
   *     the Free Software Foundation, either version 3 of the License, or
   *     (at your option) any later version.
   * 
   *     crush is distributed in the hope that it will be useful,
   *     but WITHOUT ANY WARRANTY; without even the implied warranty of
   *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *     GNU General Public License for more details.
   * 
   *     You should have received a copy of the GNU General Public License
   *     along with crush.  If not, see <http://www.gnu.org/licenses/>.
   * 
   * Contributors:
   *     Attila Kovacs <attila[AT]sigmyne.com> - initial API and implementation
   ******************************************************************************/
  package crush.fits;
  
  import crush.CRUSH;
  import jnum.parallel.ParallelTask;
  import nom.tam.fits.*;
  import nom.tam.util.*;
  
  
  public abstract class HDUReader {	
  	protected TableHDU<?> hdu;
  	protected ColumnTable<?> table;
  	
  	public HDUReader(TableHDU<?> hdu) throws FitsException {
  		this.hdu = hdu;
  		this.table = (ColumnTable<?>) hdu.getData().getData();
  	}
  
  	public abstract Reader getReader();
  	
  	public void read() throws Exception {
  		read(CRUSH.maxThreads);
  	}
  	
  	private void read(int threadCount) throws Exception {
  		if(CRUSH.executor != null) getReader().process(threadCount, CRUSH.executor);
  		else getReader().process(threadCount);
  	}
  
  	
  	public abstract class Reader extends ParallelTask<Void> {
  		@Override
  		public void processChunk(int i, int threadCount) throws Exception {
  			final int frames = hdu.getNRows();
  			for(; i<frames; i+=threadCount) {
  				processRow(i);
  			}
  		}
  			
  		public abstract void processRow(int i) throws Exception;
  		
  	}
  	
  }
  