/* Copyright 2010 ESRI
* 
* All rights reserved under the copyright laws of the United States
* and applicable international laws, treaties, and conventions.
* 
* You may freely redistribute and use this sample code, with or
* without modification, provided you include the original copyright
* notice and use restrictions.
* 
* See the use restrictions.
* 
*/
package arcgissamples.addins.util;

import java.io.File;
import java.util.Enumeration;
import java.util.Hashtable;
import javax.swing.filechooser.FileFilter;

public class ShapeFileFilter extends FileFilter {

  /* All Global Declarations */
  private Hashtable filters = null;
    private String description = null;
    private String fullDescription = null;
    private boolean useExtensionsInDescription = true;

    public ShapeFileFilter() {
      this.filters = new Hashtable();
    }

    public boolean accept(File f) {
    if(f != null) {
        if(f.isDirectory()) {
          return true;
        }
        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 boolean isExtensionListInDescription() {
      return useExtensionsInDescription;
    }
}