//package com.Sondaicus.GUI.utils;

import java.io.File;
/**
<b>Generic File Filter</b><br><BR>
This class is a method of having a generic file filter to be used with any file 
extension that you require. At construction time this information is supplied
to the constructor<br>
<br><b>Copyright &copy Sondaicus.com and Jon Sharpe 1999.<br></b><BR><BR>
<I><B> Please note this code is distributed "as is" and without any form of
warrenty. If you find any bugs please email jonsharpe@sondaicus.com<br>
<br></i>
Please contact Sondaicus.com (jonsharpe@sondaicus.com) for details of licensing</b><br>
@author Jon Sharpe
@version 1.0
*/
public class GenericFileFilter extends javax.swing.filechooser.FileFilter 
{
	private static final boolean ONE = true;
	private String fileExt;
	private String[] fileExts;
	private boolean type=false;
	private String description;
	private int length;
	private String extension;
	/**
	This is the constructor - it takes in the following:-<br>
	filesExtsIn - this is the array of file extensions that you wish to create a 
	file filter for. <br>
	description - this is  the description that will be displayed in the file
	chooser dialog box.
	*/
	public GenericFileFilter(String[] filesExtsIn, String description) 
	{
		if (filesExtsIn.length==1)
		{//we only have one file
			type=ONE;
			fileExt=filesExtsIn[0];
		}
		else
		{
			fileExts=filesExtsIn;
			length = fileExts.length;
		}
		this.description=description;
	}
   /**
   This is the method to allow a file to bee added to the displayed list or not.
	This method is called by the model that handles the FileChooser dialog
	*/
    public boolean accept(File f) 
	 {
		if (f.isDirectory()) 
		{
      	return true;
      }
      extension = getExtension(f);
      if (extension != null) 
	  {
			if(type)
				return check(fileExt);
			else
			{
				for(int i=0;i<length;i++)
				{
					if (check(fileExts[i]))
						return true;	
				}
			}
       }
       return false;
    }
	/**
	This checks to see if the extension (stored) is the same as the file type
	stored at construction time. The "in" being the value passed over.
	*/
	private boolean check(String in)
	{
		return extension.equalsIgnoreCase(in);
	}
   /**
   This is the method defined by the model
	*/
    public String getDescription() 
	 {
        return description;
    }
	/**
	This is the method to get the file extension from the file name
	*/
	 private String getExtension(File file) 
	 {
      String filename = file.getName();
		int length = filename.length();
      int i = filename.lastIndexOf('.');
		if (i > 0 &&  i < length - 1) 
			return filename.substring(i+1).toLowerCase();
      return null;
   }
}