ExtensionFileFilter.java Source code

Introduction

Here is the source code for ExtensionFileFilter.java

Source

import java.io.File;

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

class ExtensionFileFilter extends FileFilter {
    String description;

    String extensions[];

    public ExtensionFileFilter(String description, String extension) {
        this(description, new String[] { extension });
    }

    public ExtensionFileFilter(String description, String extensions[]) {
        if (description == null) {
            this.description = extensions[0] + "{ " + extensions.length + "} ";
        } else {
            this.description = description;
        }
        this.extensions = (String[]) extensions.clone();
        toLower(this.extensions);
    }

    private void toLower(String array[]) {
        for (int i = 0, n = array.length; i < n; i++) {
            array[i] = array[i].toLowerCase();
        }
    }

    public String getDescription() {
        return description;
    }

    public boolean accept(File file) {
        if (file.isDirectory()) {
            return true;
        } else {
            String path = file.getAbsolutePath().toLowerCase();
            for (int i = 0, n = extensions.length; i < n; i++) {
                String extension = extensions[i];
                if ((path.endsWith(extension) && (path.charAt(path.length() - extension.length() - 1)) == '.')) {
                    return true;
                }
            }
        }
        return false;
    }
}

public class JFileChooserWithCustomizedFilter {

    public static void main(String[] a) {
        JFileChooser fileChooser = new JFileChooser(".");
        FileFilter jpegFilter = new ExtensionFileFilter(null, new String[] { "JPG", "JPEG" });

        fileChooser.addChoosableFileFilter(jpegFilter);

        fileChooser.showOpenDialog(null);
    }

}