source: josm/src/org/openstreetmap/josm/actions/DiskAccessAction.java@ 290

package org.openstreetmap.josm.actions;

import static org.openstreetmap.josm.tools.I18n.tr;

import java.io.File;

import javax.swing.JFileChooser;
import javax.swing.JOptionPane;

import org.openstreetmap.josm.Main;

/**
 * Helper class for all actions, that access the disk
 */
abstract public class DiskAccessAction extends JosmAction {

        public DiskAccessAction(String name, String iconName, String tooltip, int shortCut, int modifiers) {
                super(name, iconName, tooltip, shortCut, modifiers, true);
        }
        
        protected static JFileChooser createAndOpenFileChooser(boolean open, boolean multiple) {
                String curDir = Main.pref.get("lastDirectory");
                if (curDir.equals(""))
                        curDir = ".";
                JFileChooser fc = new JFileChooser(new File(curDir));
                fc.setMultiSelectionEnabled(multiple);
                for (int i = 0; i < ExtensionFileFilter.filters.length; ++i)
                        fc.addChoosableFileFilter(ExtensionFileFilter.filters[i]);
                fc.setAcceptAllFileFilterUsed(true);
        
                int answer = open ? fc.showOpenDialog(Main.parent) : fc.showSaveDialog(Main.parent);
                if (answer != JFileChooser.APPROVE_OPTION)
                        return null;
                
                if (!fc.getCurrentDirectory().getAbsolutePath().equals(curDir))
                        Main.pref.put("lastDirectory", fc.getCurrentDirectory().getAbsolutePath());

                if (!open) {
                        File file = fc.getSelectedFile();
                        if (file == null || (file.exists() && JOptionPane.YES_OPTION != 
                                        JOptionPane.showConfirmDialog(Main.parent, tr("File exists. Overwrite?"), tr("Overwrite"), JOptionPane.YES_NO_OPTION)))
                                return null;
                }
                
                return fc;
        }
}