Improved file chooser settings

src/main/java/ru/ras/iph/impose/FileChooser.java

@@ -1,23 +1,44 @@
 package ru.ras.iph.impose;
 
+import java.awt.Dimension;
 import java.io.File;
 import javax.swing.JFileChooser;
 import javax.swing.JFrame;
+import javax.swing.filechooser.FileNameExtensionFilter;
 public class FileChooser extends JFrame {
+	private static String FILENAME_EXT = "pdf";
 	public static void main(String [] args){
-		chooseFile();
+		chooseFile("");
 	}
-	public static File chooseFile(){
+
+	public static File chooseFile(String lastPath){
 		File selected = null;
+
+		File currentDirectory = null;
+		if (lastPath != null && !lastPath.isEmpty()) {
+			File preselected = new File(lastPath);
+			if (preselected.exists()) {
+				if (preselected.isFile()) {
+					currentDirectory = preselected.getParentFile();
+				} else if (preselected.isDirectory()) {
+					currentDirectory = preselected;
+				}
+			}
+		}
+		if (currentDirectory == null) {
+			currentDirectory = new File(System.getProperty("user.home"));
+		}
 		JFileChooser fileChooser = new JFileChooser();
-		fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
+		fileChooser.setPreferredSize(new Dimension(800,600));
+		fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
+		FileNameExtensionFilter filter = new FileNameExtensionFilter(FILENAME_EXT.toUpperCase(), FILENAME_EXT.toLowerCase());
+		fileChooser.setFileFilter(filter);
+		fileChooser.setCurrentDirectory(currentDirectory);
 		int result = fileChooser.showOpenDialog(null);
-		if (result == fileChooser.APPROVE_OPTION){
+		if (result == JFileChooser.APPROVE_OPTION){
 			selected = fileChooser.getSelectedFile();
-			System.out.println("Selected file " + selected.getAbsolutePath());
 		}
 		return selected;
-		
+
 	}
-
 }