package filefilters;

import java.io.File;

import javax.swing.JFileChooser;

public class FileChooserDemoApp {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new FileChooserDemoApp().init();
	}
	
	// displays the JFileChooser dialog
	private void init() {
		JFileChooser jfc = new JFileChooser(); // starts in default directory
		//		JFileChooser jfc = new JFileChooser("."); // starts in working folder (project folder)
		jfc.setDialogTitle("Please select a file");
//		jfc.setFileFilter( new CustomFilter(".txt") );

		int status;
		status = jfc.showDialog(null, "Press me!"); // "generic" dialog with customizable "approve" button
//			status = jfc.showOpenDialog(null); // has an "open" button 
//			status = jfc.showSaveDialog(null); // has a "save" button

		if( status == JFileChooser.APPROVE_OPTION ) { // "Open" button was pressed
			File selected = jfc.getSelectedFile();
			String filename = selected.getName();
			System.out.println(filename + " was selected.");
		} else { // Cancel was pressed
			System.exit(0);
		}
	}

	
	/**
	 * Custom FileFilter
	 * used by JFileChooser to select specific files
	 */
	private class CustomFilter extends javax.swing.filechooser.FileFilter {
		
		private String extensionFilter; // file extension specifier
		
		// constructor
		// @param extension - the file type to filter
		public CustomFilter( String extension ) {
			extensionFilter = extension;
//TODO: add exception handling to catch invalid extensions....
		}
		
		@Override
		/*
		 * sets what files are accepted
		 */
		public boolean accept(File file) {
			if( file.isDirectory() ) // directory
				return true;

			if( file.getName().toLowerCase().endsWith(extensionFilter) ) // text file
				return true;

			return false;
		}

		@Override
		/*
		 * the label of the filter
		 */
		public String getDescription(){
			return extensionFilter + " files";
		}
	}
}