private void closeChannel(){
		try {
    		if(this.fileInput != null){
    			this.fileInput.close();
    			this.fileInput = null;
    		}
    		
    		if(this.fileChannel != null){
    			this.fileChannel.close();
    			this.fileChannel = null;
    		}
    	}catch (IOException ex) {
    		ex.printStackTrace();   
    	}
	}