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jCOLIBRI is a java framework for the development of Case-Based Reasoning systems.

There is a newer version: 3.2

/**
 * FileIO.java
 * jCOLIBRI2 framework. 
 * @author Juan A. Recio-Garc�a.
 * GAIA - Group for Artificial Intelligence Applications
 * http://gaia.fdi.ucm.es
 * 03/01/2007
 */
package es.ucm.fdi.gaia.jcolibri.util;

import org.apache.logging.log4j.LogManager;

import java.io.File;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Utility functions to transparently access to files in the file system, jar file, classpath...
 * @author Juan A. Recio-Garcia
 * @version 1.0
 */
public class FileIO {

	/**
	 * Returns the URL that localizes a file. It tries the following locations:
	 * 
	 * The path recieved by parameter
	 * 
"bin/"+path
	 * 
"src/"+path
	 * 
"/"+path
	 * 
path inside a jar
	 * 
"/"+path inside a jar
	 * 
	 */
	@SuppressWarnings("deprecation")
	public static URL findFile(String file)
	{
		
		File f;
		
		try {
			f = new File(file);
			if(f.exists())
				return f.toURL();
		} catch (MalformedURLException e1) {}
		
		try {
		f = new File("bin/"+file);
		if(f.exists())
			return f.toURL();
		} catch (MalformedURLException e1) {}
		
		try {
		f = new File("src/"+file);
		if(f.exists())
			return f.toURL();
		} catch (MalformedURLException e1) {}
		
		file = file.replace('\\','/');
		try {
			URL url = FileIO.class.getResource(file);
			if(url!= null)
			return url;
		} catch (Exception e) {}

		try {
			URL url = FileIO.class.getResource("/"+file);
			if(url!= null)
			return url;
		} catch (Exception e) {}

		LogManager.getLogger(FileIO.class).warn("File not found: "+file);
		return null;
	}
	
	/**
	 * Tries to return an input stream of the file
	 */
	public static InputStream openFile(String file)
	{
	    	URL url = null;
		try
		{
		    url =  new URL(file);
		    return url.openStream();
		}catch(Exception e) {}
		
		url = findFile(file);
		try
		{
		    return url.openStream();
		}catch(Exception e) {}
	    
		file = file.replace('\\','/');
		file = file.substring(file.indexOf('!')+1);
		try {
			return FileIO.class.getResourceAsStream(file);
		} catch (Exception e) {}

		try {
		    	return FileIO.class.getResourceAsStream("/"+file);
		} catch (Exception e) {}

		LogManager.getLogger(FileIO.class).warn("Error opening stream for: "+file);
		return null;
	}
}