/*******************************************************************************
 *******************************************************************************/


package at.gv.egiz.eaaf.core.impl.utils;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;

/**
 * Utility for accessing files on the file system, and for reading from input streams.
 * @author Paul Ivancsics
 * @version $Id$
 */
public class FileUtils {
  
  /**
   * Reads a file, given by URL, into a byte array.
   * @param urlString file URL
   * @return file content
   * @throws IOException on any exception thrown
   */
  public static byte[] readURL(String urlString) throws IOException {	  
    URL url = new URL(urlString);
    InputStream in = new BufferedInputStream(url.openStream());
    byte[] content = StreamUtils.readStream(in);
    in.close();
    return content;
  }

  /**
   * Reads a file from a resource.
   * @param name resource name
   * @return file content as a byte array
   * @throws IOException on any exception thrown
   */
  public static byte[] readResource(String name) throws IOException {
    ClassLoader cl = FileUtils.class.getClassLoader();
    BufferedInputStream in = new BufferedInputStream(cl.getResourceAsStream(name));
    byte[] content = StreamUtils.readStream(in);
    in.close();
    return content;
  }
  /**
   * Reads a file from a resource.
   * @param name filename
   * @param encoding character encoding
   * @return file content
   * @throws IOException on any exception thrown
   */
  public static String readResource(String name, String encoding) throws IOException {
    byte[] content = readResource(name);
    return new String(content, encoding);
  }
  
  
	/**
	 * Returns the absolute URL of a given url which is relative to the parameter root
	 * @param url
	 * @param root
	 * @return String
	 * @throws MalformedURLException 
	 */
	public static String makeAbsoluteURL(String url, URI root) throws MalformedURLException {
		return makeAbsoluteURL(url, root.toURL().toString());

	}  
  
	/**
	 * Returns the absolute URL of a given url which is relative to the parameter root
	 * @param url
	 * @param root
	 * @return String
	 */
	public static String makeAbsoluteURL(String url, String root) {
		//if url is relative to rootConfigFileDirName make it absolute 					
		
		File keyFile;
		String newURL = url;

		if(null == url) return  null;
    
		if (url.startsWith("http:/") || url.startsWith("https:/") || url.startsWith("file:/") || url.startsWith("ftp:/")) {
			return url;
			
		} else {
			// check if absolute - if not make it absolute
			keyFile = new File(url);
			if (!keyFile.isAbsolute()) {
				keyFile = new File(root, url);

				if (keyFile.toString().startsWith("file:"))
					newURL = keyFile.toString();
        
				else
					newURL = keyFile.toURI().toString();
        
			}
			return newURL;
		}
	}  
	
	
	 private static void copy( InputStream fis, OutputStream fos )
	  {
	    try
	    {
	      byte[] buffer = new byte[ 0xFFFF ];
	      for ( int len; (len = fis.read(buffer)) != -1; )
	        fos.write( buffer, 0, len );
	    }
	    catch( IOException e ) {
	      System.err.println( e );
	    }
	    finally {
	      if ( fis != null )
	        try { fis.close(); } catch ( IOException e ) { e.printStackTrace(); }
	      if ( fos != null )
	        try { fos.close(); } catch ( IOException e ) { e.printStackTrace(); }
	    }
	  }
	 
	 public static void copyFile(File src, File dest)
	  {
	    try
	    {
	      copy( new FileInputStream( src ), new FileOutputStream( dest ) );
	    }
	    catch( IOException e ) {
	      e.printStackTrace();
	    }
	  }
  
}