package com.yem.ensign.common;

import java.io.File;
import java.util.Enumeration;
import java.util.Hashtable;

import javax.swing.filechooser.FileFilter;

public class MyFileFilter extends FileFilter {


    private static String TYPE_UNKNOWN = "Type   Unknown ";  
    private static String HIDDEN_FILE = "Hidden   File ";  
    private Hashtable filters = null;  
    private String description = null;  
    private String fullDescription = null;  
    private boolean useExtensionsInDescription = true;  
  
    public MyFileFilter() {  
        this.filters = new Hashtable();  
    }  
  
    public MyFileFilter(String extension) {  
        this(extension, null);  
    }  
  
    public MyFileFilter(String extension, String description) {  
        this();  
        if (extension != null) {  
            addExtension(extension);  
        }  
        if (description != null) {  
            setDescription(description);  
        }  
    }  
  
    public MyFileFilter(String[] filters) {  
        this(filters, null);  
    }  
  
    public MyFileFilter(String[] filters, String description) {  
        this();  
        for (int i = 0; i < filters.length; i++) {  
            //   add   filters   one   by   one   
            addExtension(filters[i]);  
        }  
        if (description != null) {  
            setDescription(description);  
        }  
    }  
  
    public boolean accept(File f) {  
        if (f != null) {  
        	if(f.isDirectory()){
        		if(f.isAbsolute()){
        			return true;
        		}else{
        			return false;
        		}
        	}else{
	            String extension = getExtension(f);  
	            if (extension != null && filters.get(getExtension(f)) != null) {  
	                return true;  
	            }; 
        	}
        }  
        return false;  
    }  
  
    public String getExtension(File f) {  
        if (f != null) {  
            String filename = f.getName();  
            int i = filename.lastIndexOf('.');  
            if (i > 0 && i < filename.length() - 1) {  
                return filename.substring(i + 1).toLowerCase();  
            };  
        }  
        return null;  
    }  
  
    public void addExtension(String extension) {  
        if (filters == null) {  
            filters = new Hashtable(5);  
        }  
        filters.put(extension.toLowerCase(), this);  
        fullDescription = null;  
    }  
  
    public String getDescription() {  
        if (fullDescription == null) {  
            if (description == null || isExtensionListInDescription()) {  
                fullDescription = description == null ? "( " : description + "   ( ";  
//   build   the   description   from   the   extension   list   
                Enumeration extensions = filters.keys();  
                if (extensions != null) {  
                    fullDescription += ". " + (String) extensions.nextElement();  
                    while (extensions.hasMoreElements()) {  
                        fullDescription += ",   " + (String) extensions.nextElement();  
                    }  
                }  
                fullDescription += ") ";  
            } else {  
                fullDescription = description;  
            }  
        }  
        return fullDescription;  
    }  
  
    public void setDescription(String description) {  
        this.description = description;  
        fullDescription = null;  
    }  
  
    public void setExtensionListInDescription(boolean b) {  
        useExtensionsInDescription = b;  
        fullDescription = null;  
    }  
  
    public boolean isExtensionListInDescription() {  
        return useExtensionsInDescription;  
    }  

}
