FileUtils.java

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package edu.isi.pegasus.common.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.channels.FileChannel;

/**
 * A FileUtility class to use for functions not supported by native JAVA File
 * class.
 *
 * @author Karan Vahi
 */
public class FileUtils {
    
    /**
     * Copies a file to the specified directory.
     * 
     * @param file          the file to be copied.
     * @param toDirectory   the directory to which the file should be copied.
     * 
     * @return file object to the copied file.
     * 
     * @throws IOException in case of errors
     */
    public static File copy( File file, File toDirectory ) throws IOException{
        
        if( file == null || !file.exists() || !file.canRead() ){
            throw new IOException( "Unable to find source file to be copied " + file );
        }
        String basename = file.getName();
        
        File destFile = new File( toDirectory, basename.toString() ); 
            
        if ( ! toDirectory.exists() ) toDirectory.createNewFile();

        FileChannel fcSrc = null;
        FileChannel fcDst = null;
        try {
          fcSrc = new FileInputStream( file ).getChannel();
          fcDst = new FileOutputStream( destFile ).getChannel();
          fcDst.transferFrom(fcSrc, 0, fcSrc.size() );
        } finally {
          if ( fcSrc != null ) fcSrc.close();
          if ( fcDst != null ) fcDst.close(); 
        }
	  
        return destFile;
    } 
    
}