Generic File Filter : FileFilter « File « Java Tutorial

1. Java Tutorial
2. File
3. FileFilter

import java.io.File;

import javax.swing.filechooser.FileFilter;

public class GenericFileFilter extends FileFilter {
  private String[] fileExts;

  private String description;

  private String extension;

  public GenericFileFilter(String[] filesExtsIn, String description) {
    fileExts = filesExtsIn;

    this.description = description;
  }

  public boolean accept(File f) {
    if (f.isDirectory()) {
      return true;
    }
    extension = getExtension(f);
    if (extension != null) {
      for (int i = 0; i < fileExts.length; i++) {
        if (check(fileExts[i]))
          return true;
      }
    }
    return false;
  }

  private boolean check(String in) {
    return extension.equalsIgnoreCase(in);
  }

  public String getDescription() {
    return description;
  }

  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;
  }
}