IRAFTextImageLoad.java

/**
 * 
 */
package fr.unistra.pelican.algorithms.io;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

import fr.unistra.pelican.Algorithm;
import fr.unistra.pelican.AlgorithmException;
import fr.unistra.pelican.DoubleImage;
import fr.unistra.pelican.Image;
import fr.unistra.pelican.algorithms.visualisation.MViewer;

/**
 * Load an image save as text as if it was generated by wtext in dataio package in IRAF without any header. User must provide x and y dimensions as they are not stored in the file.
 * 
 * @author Benjamin Perret
 *
 */
public class IRAFTextImageLoad extends Algorithm {

	/**
	 * Path to the file to be read
	 */
	public String filename;
	
	/**
	 * x dimension of result
	 */
	public int xdim;
	
	/**
	 * y dimension of result
	 */
	public int ydim;
	
	/**
	 * Result
	 */
	public Image output;
	
	
	
	
	/**
	 * 
	 */
	public IRAFTextImageLoad() {
		super();
		super.inputs="filename,xdim,ydim";
		super.outputs="output";
	}




	/* (non-Javadoc)
	 * @see fr.unistra.pelican.Algorithm#launch()
	 */
	@Override
	public void launch() throws AlgorithmException {
		File f=new File(filename);
		try {
			BufferedReader br= new BufferedReader(new FileReader(f));
			String line;
			int i=0;
			output=new DoubleImage(xdim,ydim,1,1,1);
			int size=xdim*ydim;
			while((line=br.readLine()) != null)
			{
				
				String [] toks=line.split(" ");
				for(String t:toks)
					if(!"".equals(t))
					{
					
						if(i==size)
							throw new AlgorithmException("Dimension errors with file " +f + ". User specified xdim = " + xdim +" and ydim = " + ydim +" but file contains more than " + size + " values." );
						double v=Double.parseDouble(t);
						output.setPixelDouble(i++, v);
					
					}
				
					
			}
			if(i!=size)
				throw new AlgorithmException("Dimension errors with file " +f + ". User specified xdim = " + xdim +" and ydim = " + ydim +" but file contains less than " + size + " values." );
			
		} catch (FileNotFoundException e) {
			throw new AlgorithmException("Error opening file " +f,e);
		} catch (IOException e) {
			throw new AlgorithmException("Error reading file " +f,e);
		}catch (NumberFormatException e) {
			throw new AlgorithmException("Error reading file " +f + " : value can not be parsed as a double.",e);
		}
		
	}
	
	public static Image exec(String filename, int xdim, int ydim)
	{
		return (Image)(new IRAFTextImageLoad().process(filename,xdim,ydim));
	}

	
	public static void main(String [] args)
	{
		Image im=IRAFTextImageLoad.exec("d:\\perret\\aims\\thegood.txt",	 150, 150);
		MViewer.exec(im);
	}
}