package pl.wroc.pwr.image.io;

import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;

import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;

import pl.wroc.pwr.IOperator;
import pl.wroc.pwr.image.IRGBImage;
import pl.wroc.pwr.image.converter.external.RenderedImagetoRGBConverter;

import com.sun.media.jai.codec.FileSeekableStream;

/**
 * Generic image loader routine.
 * Should be able to load images of any kind.
 * @author Mariusz Paradowski
 */
public class GenericLoader implements IOperator< IRGBImage > {
	/**
	 * 
	 */
	private static final long serialVersionUID = -5525818153995244353L;
	private static String JAI_COMMAND = "stream"; //$NON-NLS-1$
	
	public File imageFile;
		
	public GenericLoader(File imageFile) {
		this.imageFile = imageFile;
		//System.out.println("GenericLoader on " + imageFile.getName()); //$NON-NLS-1$
	}
	
	public GenericLoader(String imageFile) {
		this(new File(imageFile));
	}
	
	public void setImageFile(File file) {
		this.imageFile = file;
	}
	
	public IRGBImage apply() {
		FileSeekableStream stream = null;
        try {
            stream = new FileSeekableStream(this.imageFile);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
        RenderedOp inputImage = JAI.create(JAI_COMMAND, stream);
        if (inputImage == null) {
        	System.out.println("Błąd odczytu obrazu przez pakiet JAI.");
        	return null;
        }
        RenderedImagetoRGBConverter converter = new RenderedImagetoRGBConverter(inputImage);
        return converter.apply();
	}
}