updated translations, added java doc comments

pom.xml

@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>BelegScanner</groupId>
 	<artifactId>BelegScanner</artifactId>
-	<version>1.0.2</version>
+	<version>1.0.3</version>
 	
 	<name>BelegScanner</name>
 	<packaging>jar</packaging>

resources/translations/Application.de.translation

@@ -1,11 +1,30 @@
+Actions : Aktionen
 Category : Kategorie
 CATEGORY : KATEGORIE
+Conversion failed. : Konvertierung fehlgeschlagen.
+Converting to PDF… : Kovertiere zu PDF…
+current resolution : aktuelle Auflösung
 DAY : TAG
-height : Höhe
+Directory : Ordner
+display preview : Vorschau anzeigen
+done : fertig
+Error code\: {} for {} : Fehlercode: {} für  {}
 Finished text recognition. : Texterkennung beendet.
+Height : Höhe
+Joining PDFs… : Verbinde PDFs…
+join PDFs : PDFs zusammenführen
 MONTH : MONAT
+OCR failed. : OCR fehlgeschlagen.
+open folder : Ordner öffnen
+Path '{}' does not exist! : Pfad '{}' existiert nicht!
 Path : Pfad
+PDFs joined. : Zusammengefügt.: 
 Press Shift + Delete to remove an entry. : Drücken Sie Umschalt + Entf um einen Eintrag zu löschen
-scanning… : Scanne…
-width : Breite
+Scan failed. : Scannen fehlgeschlagen.
+Scanning… : Scanne…
+scan! : scannen!
+State : Status
+{} terminated\: : {} abgebrochen:
+Text recognition… : Texterkennung…
+Width : Breite
 YEAR : JAHR

resources/translations/DateChooser.de.translation

@@ -0,0 +1,12 @@
+December : Dezember
+February : Februar
+January : Januar
+July : Juli
+June : Juni
+March : März
+May : Mai
+October : Oktober
+Su : So 
+Th : Do
+Tu : Di
+We : Mi

src/main/java/de/srsoftware/belegscanner/Application.java

@@ -5,6 +5,12 @@ import java.io.IOException;
 import de.srsoftware.belegscanner.gui.MainFrame;
 import de.srsoftware.tools.translations.Translation;
 
+/**
+ * Application to scan receipts : entry point
+ * 
+ * @author Stephan Richter <s.richter@srsoftware.de>
+ *
+ */
 public class Application {
 	
 	public static void main(String[] args) throws IOException {
@@ -13,6 +19,12 @@ public class Application {
 		app.setDefaultCloseOperation(MainFrame.EXIT_ON_CLOSE);
 	}
 	
+	/**
+	 * Translate a text.
+	 * @param txt the text to be translated.
+	 * @param fills Replacements for occurrences of the place holders ('{}').
+	 * @return
+	 */
 	public static String t(String txt, Object...fills) {
 		return Translation.get(Application.class, txt, fills);
 	}

src/main/java/de/srsoftware/belegscanner/Configuration.java

@@ -13,12 +13,24 @@ import org.json.JSONObject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * 
+ * JSON-based Configuration manager for the Application.
+ * 
+ * @author Stephan Richter <s.richter@srsoftware.de>
+ *
+ */
 public class Configuration {
 
 	private static final Logger LOG = LoggerFactory.getLogger(Configuration.class);
 	private File file;
 	private JSONObject json = new JSONObject();
 
+	/**
+	 * Create/Load configuration for the application.
+	 * @param appName
+	 * @throws IOException
+	 */
 	public Configuration(String appName) throws IOException {
 		String home = System.getProperty("user.home");
 		String fileName = new StringBuilder().append(home).append(File.separator).append(".config").append(File.separator).append(appName).append(File.separator).append("config.json").toString();
@@ -40,6 +52,10 @@ public class Configuration {
 		}
 	}
 	
+	/**
+	 * Write contents of the configuration object to the underlying file.
+	 * @throws IOException
+	 */
 	public void save() throws IOException {
 		LOG.debug("Trying to save config…");
 		File dir = file.getParentFile();
@@ -49,6 +65,11 @@ public class Configuration {
 		out.close();
 	}
 
+	/**
+	 * Load an JSON array from the configuration
+	 * @param key Search path in the form path.to.array
+	 * @return
+	 */
 	public JSONArray getOrCreateArray(String key) {
 		LOG.debug("requesting {} from config.",key);
 		String[] parts = key.split("\\.");
@@ -76,6 +97,12 @@ public class Configuration {
 		return result;
 	}
 	
+	/**
+	 * Load an Object from the configuration
+	 * @param <T>
+	 * @param key Search path in the form path.to.array
+	 * @return null, if no such path is found
+	 */
 	@SuppressWarnings("unchecked")
 	public <T> T get(String key) {
 		LOG.debug("requesting {} from config.",key);
@@ -92,6 +119,13 @@ public class Configuration {
 		return null;
 	}
 	
+	/**
+	 * Load an Object from the configuration, create it, if it is not present
+	 * @param <T>
+	 * @param key Search path in the form path.to.array
+	 * @param preset Content for the path, if it does not exist
+	 * @return preset, if no such path is found
+	 */
 	@SuppressWarnings("unchecked")
 	public <T> T getOrCreate(String key, T preset) {
 		LOG.debug("requesting {} from config.",key);
@@ -120,6 +154,11 @@ public class Configuration {
 		return (T) result;
 	}
 	
+	/**
+	 * Add a new value to the configuration or replace an existing value
+	 * @param key Search path in the form path.to.array
+	 * @param value the value to add/replace
+	 */
 	public void set(String key, Object value) {
 		LOG.debug("setting {} to {}",key,value);
 		String[] parts = key.split("\\.");

src/main/java/de/srsoftware/belegscanner/gui/DocTable.java

@@ -31,6 +31,12 @@ import org.slf4j.LoggerFactory;
 import de.srsoftware.belegscanner.Constants;
 import static de.srsoftware.belegscanner.Application.*;
 
+/**
+ * 
+ * Creates a table of previously scanned documents.
+ * @author Stephan Richter <s.richter@srsoftware.de>
+ *
+ */
 public class DocTable extends JPanel{
 	
 	private static final Logger LOG = LoggerFactory.getLogger(DocTable.class);
@@ -43,6 +49,11 @@ public class DocTable extends JPanel{
 		public void show(String filename);
 	}
 
+	/**
+	 * represents on previously scanned document
+	 * @author Stephan Richter <s.richter@srsoftware.de>
+	 *
+	 */
 	private class Row{
 
 		private JLabel status;
@@ -74,6 +85,10 @@ public class DocTable extends JPanel{
 		
 
 
+		/**
+		 * drop the selected document from the table
+		 * @param row
+		 */
 		private void drop(Row row) {
 			remove(pathLabel);
 			remove(status);
@@ -83,11 +98,19 @@ public class DocTable extends JPanel{
 			rows.remove(path);
 		}
 
+		/**
+		 * update status for selected document
+		 * @param status
+		 * @return
+		 */
 		public Row status(String status) {
 			this.status.setText(status);
 			return this;
 		}
 
+		/**
+		 * remove the join button assigned with the selected document
+		 */
 		public void removeJoinButton() {
 			buttons.remove(joinButton);
 		}
@@ -100,6 +123,9 @@ public class DocTable extends JPanel{
 	private HashSet<PreviewListener> previewListeners;
 	private GridBagConstraints constraints;
 
+	/**
+	 * create a new DocTable
+	 */
 	public DocTable() {
 		setLayout(new GridBagLayout());
 		constraints = new GridBagConstraints();
@@ -122,15 +148,31 @@ public class DocTable extends JPanel{
 		previewListeners = new HashSet<>();
 	}
 
+	/**
+	 * Ad a table entry for the directory represented by path
+	 * @param path
+	 */
 	public void add(String path) {
 		if (!rows.containsKey(path)) new Row(path).status("neu");
 	}
 	
+	/**
+	 * register a listener for changes of the preview area
+	 * @param listener
+	 * @return
+	 */
 	public DocTable addPreviewListener(PreviewListener listener) {
 		previewListeners.add(listener);
 		return this;
 	}
 
+	/**
+	 * helper method to create a button with given label, tooltip and action listener
+	 * @param label
+	 * @param tooltip
+	 * @param listener
+	 * @return
+	 */
 	private static JButton button(String label, String tooltip, ActionListener listener) {
 		JButton btn = new JButton(label);
 		btn.setFont(btnFont);
@@ -139,6 +181,10 @@ public class DocTable extends JPanel{
 		return btn;
 	}
 	
+	/**
+	 * join documents in given path
+	 * @param path
+	 */
 	public void joinDocs(String path) {
 		LOG.debug("joinFiles({})",path);
 		rows.get(path).removeJoinButton();
@@ -172,6 +218,10 @@ public class DocTable extends JPanel{
 		preview(path);
 	}
 
+	/**
+	 * open given path in external file browser
+	 * @param path
+	 */
 	public void openFolder(String path) {
 		Process process = null;
 		try {
@@ -189,6 +239,10 @@ public class DocTable extends JPanel{
 		}
 	}
 
+	/**
+	 * show lates document of the given directory in preview area
+	 * @param path
+	 */
 	public void preview(String path) {
 		LOG.debug("preview({})",path);
 		File folder = new File(path);
@@ -198,6 +252,11 @@ public class DocTable extends JPanel{
 		if (!pdfs.isEmpty()) previewListeners.forEach(l -> l.show(Path.of(path,pdfs.get(0)).toString()));
 	}
 
+	/**
+	 * update state column text for given path
+	 * @param path
+	 * @param state
+	 */
 	public void setState(String path, String state) {
 		Row row = rows.get(path);
 		if (row != null) row.status(state);

src/main/java/de/srsoftware/belegscanner/gui/FilterComboBoxText.java

@@ -1,112 +0,0 @@
-package de.srsoftware.belegscanner.gui;
-
-import java.awt.EventQueue;
-import java.awt.event.ItemEvent;
-import java.awt.event.ItemListener;
-import java.awt.event.KeyAdapter;
-import java.awt.event.KeyEvent;
-import java.util.ArrayList;
-import java.util.List;
-
-import javax.swing.DefaultComboBoxModel;
-import javax.swing.JComboBox;
-import javax.swing.JFrame;
-import javax.swing.JTextField;
-import javax.swing.SwingUtilities;
-
-public class FilterComboBoxText {
-
-    private JFrame frame;
-    private final JComboBox<String> comboBox = new JComboBox<>();
-    private static List<String>listForComboBox= new ArrayList<String>();
-
-    /**
-     * Launch the application.
-     */
-    public static void main(String[] args) {
-        EventQueue.invokeLater(new Runnable() {
-            public void run() {
-                try {
-                    FilterComboBoxText window = new FilterComboBoxText();
-                    window.frame.setVisible(true);
-                } catch (Exception e) {
-                    e.printStackTrace();
-                }
-            }
-        });
-
-        listForComboBox.add("Lion");
-        listForComboBox.add("LionKing");
-        listForComboBox.add("Mufasa");
-        listForComboBox.add("Nala");
-        listForComboBox.add("KingNala");
-        listForComboBox.add("Animals");
-        listForComboBox.add("Anims");
-        listForComboBox.add("Fish");
-        listForComboBox.add("Jelly Fish");
-        listForComboBox.add("I am the boss");
-
-
-    }
-
-    public FilterComboBoxText() {
-        initialize();
-    }
-
-    private void initialize() {
-        frame = new JFrame();
-        frame.setBounds(100, 100, 412, 165);
-        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
-        frame.getContentPane().setLayout(null);
-        comboBox.setEditable(true);
-
-        comboBox.addItemListener(new ItemListener() {
-            public void itemStateChanged(ItemEvent arg0) {
-
-            }
-        });
-
-        for(String detail : listForComboBox) comboBox.addItem(detail);
-        final JTextField textfield = (JTextField) comboBox.getEditor().getEditorComponent();
-        textfield.addKeyListener(new KeyAdapter() {
-            public void keyReleased(KeyEvent ke) {
-                SwingUtilities.invokeLater(new Runnable() {
-                    public void run() {
-                        if(!textfield.getText().isEmpty()){
-                            comboBoxFilter(textfield.getText());
-                        }
-                    }
-                });
-
-            }
-        });
-        comboBox.setBounds(10, 39, 364, 29);
-        frame.getContentPane().add(comboBox);
-    }
-    
-     public void comboBoxFilter(String enteredText) {
-         System.out.println(comboBox.getItemCount());
-
-            if (!comboBox.isPopupVisible()) {
-                comboBox.showPopup();
-            }
-
-            List<String> filterArray= new ArrayList<String>();
-            for (int i = 0; i < listForComboBox.size(); i++) {
-                if (listForComboBox.get(i).toLowerCase().contains(enteredText.toLowerCase())) {
-                    filterArray.add(listForComboBox.get(i));
-                }
-            }
-            if (filterArray.size() > 0) {
-                DefaultComboBoxModel<String> model = (DefaultComboBoxModel<String>) comboBox.getModel();
-                model.removeAllElements();
-                model.addElement("");
-                for (String s: filterArray)
-                    model.addElement(s);
-
-                JTextField textfield = (JTextField) comboBox.getEditor().getEditorComponent();
-                textfield.setText(enteredText);
-            }
-        }
-
-}

src/main/java/de/srsoftware/belegscanner/gui/MainFrame.java

@@ -34,6 +34,12 @@ import static de.srsoftware.belegscanner.Application.*;
 import de.srsoftware.belegscanner.Configuration;
 
 
+/**
+ * The "guts" of the application:
+ * Combines all panels and provides execution logic.
+ * @author Stephan Richter <s.richter@srsoftware.de>
+ *
+ */
 public class MainFrame extends JFrame {
 	private static final Logger LOG = LoggerFactory.getLogger(MainFrame.class);
 
@@ -77,6 +83,10 @@ public class MainFrame extends JFrame {
 	
 	private boolean isScanning = false;
 
+	/**
+	 * Create application main frame.
+	 * @param config
+	 */
 	public MainFrame(Configuration config) {
 		super("BelegScanner");
 		this.config = config;
@@ -116,6 +126,10 @@ public class MainFrame extends JFrame {
 	
 
 
+	/**
+	 * Scans the given path for occurences of '$VARIABLES' and creates input fields for the found variables. 
+	 * @param path
+	 */
 	private void addFieldsFor(String path) {
 		Vector<String> marks = new Vector<>();
 		Matcher matches = MARKEN.matcher(path);
@@ -123,10 +137,18 @@ public class MainFrame extends JFrame {
 		toolbar.addFieldsFor(marks);
 	};
 	
+	/**
+	 * checks, whether the scan button may be enabled.
+	 */
 	private void checkScanButton() {
 		toolbar.readyToScan(!(isScanning || patchedPath==null || patchedPath.isBlank() || patchedPath.contains("$"))); 
 	}
 
+	/**
+	 * scan a new document, convert it to pdf and perform text recognition
+	 * @param path
+	 * @param dimension
+	 */
 	private void performScan(String path, Dimension dimension) {
 		LOG.debug("performScan({})",path);
 		setScanning(true);
@@ -233,6 +255,10 @@ public class MainFrame extends JFrame {
 		docTable.preview(path);
 	}
 	
+	/**
+	 * create preview panel
+	 * @return
+	 */
 	private JPanel preview() {
 		// https://stackoverflow.com/a/48248739/1285585
 		JPanel pane = new JPanel(new BorderLayout());
@@ -255,6 +281,10 @@ public class MainFrame extends JFrame {
 		return pane;
 	}
 	
+	/**
+	 * open file in preview panel
+	 * @param file
+	 */
 	private void preview(String file) {
 		pdfViewer.openDocument(file);
 		//pdfViewer.setToolBarVisible(false);
@@ -262,27 +292,48 @@ public class MainFrame extends JFrame {
 		fileName.setText(file);
 	}
 
+	/**
+	 * save config, then start scannin in separate thread
+	 * @param ev
+	 */
 	private void scan(ActionEvent ev) {
 		updateConfig();
 		new Thread(() -> performScan(patchedPath,dimension)).start();
 	}
 	
+	/**
+	 * update the category currently used
+	 * @param category
+	 */
 	private void setCategory(String category) {
 		this.category = category;
 		updatePath();
 		
 	}
 	
+	/**
+	 * update the date currently used
+	 * @param date
+	 */
 	private void setDate(Date date) {
 		this.date = date;
 		updatePath();
 	}
 	
+	/**
+	 * update the scan dimensions currently used
+	 * @param dim
+	 */
 	private void setDimension(Dimension dim) {
 		this.dimension = dim;		
 	}
 
 
+	/**
+	 * update the value of a variable field
+	 * @param key
+	 * @param val
+	 */
 	private void setField(String key, String val) {
 		if (val == null || val.isEmpty()) {
 			fields.remove(key);
@@ -291,18 +342,29 @@ public class MainFrame extends JFrame {
 	}
 
 
+	/**
+	 * update the path currently used as scan target directory
+	 * @param path
+	 */
 	private void setPath(String path) {
 		this.path = path;
 		updatePath();
 	}
 	
 	
+	/**
+	 * toggle scanning state
+	 * @param scanning
+	 */
 	private void setScanning(boolean scanning) {
 		isScanning = scanning;
 		checkScanButton();
 	}
 	
 	
+	/**
+	 * push current settings to the configuration, then save it.
+	 */
 	private void updateConfig() {
 		
 		String prefix = "app.categories."+category+".";
@@ -332,6 +394,9 @@ public class MainFrame extends JFrame {
 		}
 	}
 	
+	/**
+	 * compile path, variable values, date to a patched path
+	 */
 	@SuppressWarnings("deprecation")
 	private void updatePath() {
 		LOG.debug("updatePath() [path = {}]",path);		

src/main/java/de/srsoftware/belegscanner/gui/StatusBar.java

@@ -8,6 +8,12 @@ import javax.swing.border.EmptyBorder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+/**
+ * Simple status barwith updateable text.
+ * This class may be extended to show more status information.
+ * @author Stephan Richter <s.richter@srsoftware.de>
+ *
+ */
 public class StatusBar extends JPanel {
 
 	private static final Logger LOG = LoggerFactory.getLogger(StatusBar.class);
@@ -15,8 +21,6 @@ public class StatusBar extends JPanel {
 	private static final long serialVersionUID = 8102800846089594705L;
 	private JLabel path;
 
-	//private JLabel action;
-
 	public StatusBar() {
 		setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
 		add(path = new JLabel("Kein Pfad gewält."));		

src/main/java/de/srsoftware/belegscanner/gui/Toolbar.java

@@ -38,6 +38,11 @@ import de.srsoftware.tools.gui.SelectComboBox;
 
 import static de.srsoftware.belegscanner.Application.*;
 
+/**
+ * create the application's toolbar
+ * @author Stephan Richter <s.richter@srsoftware.de>
+ *
+ */
 public class Toolbar extends JPanel {
 	
 	private static final Logger LOG = LoggerFactory.getLogger(Toolbar.class);
@@ -91,6 +96,10 @@ public class Toolbar extends JPanel {
 	private SelectComboBox catPicker;
 	private int resolution = 150;
 
+	/**
+	 * create toolbar
+	 * @param config
+	 */
 	public Toolbar(Configuration config) {
 		this.config = config;
 		setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
@@ -104,32 +113,59 @@ public class Toolbar extends JPanel {
 		Arrays.stream(getComponents()).filter(c -> c instanceof JPanel).map(JPanel.class::cast).forEach(p -> p.setBorder(BORDER));
 	}
 
-
-	private JPanel resolutionSelector() {
-		ButtonGroup group = new ButtonGroup();
-		JPanel resolutionSelector = new JPanel(new BorderLayout());
-		JLabel label = new JLabel(t("current resolution")+": "+resolution+"px");
-		resolutionSelector.add(label, BorderLayout.NORTH);
-		resolutionSelector.add(resolutionButton(group,label,150),BorderLayout.WEST);
-		resolutionSelector.add(resolutionButton(group,label,300),BorderLayout.CENTER);
-		resolutionSelector.add(resolutionButton(group,label,600),BorderLayout.EAST);
-		resolutionSelector.setMaximumSize(new Dimension(600,200));
-		return resolutionSelector;
+	/**
+	 * add a listener for updates of the categoriy field
+	 * @param listener
+	 * @return
+	 */
+	public Toolbar addCategoryListener(CategoryListener listener) {
+		categoryListeners.add(listener);
+		return this;
 	}
-
-
-	private JRadioButton resolutionButton(ButtonGroup group, JLabel label, int i) {
-		JRadioButton btn = new JRadioButton(i+" px");		
-		btn.addActionListener(ev -> {
-			resolution = i;
-			label.setText("aktuelle Auflösung: "+resolution+"px");
-		});
-		group.add(btn);
-		if (i==150) btn.setSelected(true);
-		return btn;
+	
+	/**
+	 * add a listener for updates of the date selector
+	 * @param listener
+	 * @return
+	 */
+	public Toolbar addDateListener(DateListener listener) {
+		dateListeners.add(listener);
+		return this;
+	}	
+	
+	/**
+	 * add a listener for changes to the dimension form
+	 * @param listener
+	 * @return
+	 */
+	public Toolbar addDimensionListener(DimensionListener listener) {
+		dimensionListeners.add(listener);
+		return this;
 	}
-
-
+		
+	/**
+	 * add an input field for a variable placeholder
+	 * @param marks
+	 */
+	public void addFieldsFor(Vector<String> marks) {
+		LOG.debug("addFieldsFor({})",marks);
+		
+		List<String> deleted = additonalComponents.keySet().stream().filter(key -> !marks.contains(key)).collect(Collectors.toList());
+		deleted.forEach(name -> remove(additonalComponents.remove(name)));			
+		
+		for (String name : marks) {
+			if (additonalComponents.containsKey(name)) continue;
+			SelectComboBox valuePicker = new SelectComboBox(new Vector<>()).onUpdateText(newText -> updateField(name,newText));
+			JPanel input = input(name, valuePicker);
+			input.setBorder(BORDER);
+			add(input,getComponentCount()-OFFSET);
+			additonalComponents.put(name, input);
+		}
+	}
+	
+	/**
+	 * add a form that enables the user to set the size of the scanning area
+	 */
 	private void addFormatSelector() {
 		JPanel dummy = new JPanel();
 		dummy.setLayout(new BorderLayout());
@@ -160,53 +196,46 @@ public class Toolbar extends JPanel {
 		height.addKeyListener(dimensionListener);
 	}
 
-	public void addFieldsFor(Vector<String> marks) {
-		LOG.debug("addFieldsFor({})",marks);
-		
-		List<String> deleted = additonalComponents.keySet().stream().filter(key -> !marks.contains(key)).collect(Collectors.toList());
-		deleted.forEach(name -> remove(additonalComponents.remove(name)));			
-		
-		for (String name : marks) {
-			if (additonalComponents.containsKey(name)) continue;
-			SelectComboBox valuePicker = new SelectComboBox(new Vector<>()).onUpdateText(newText -> updateField(name,newText));
-			JPanel input = input(name, valuePicker);
-			input.setBorder(BORDER);
-			add(input,getComponentCount()-OFFSET);
-			additonalComponents.put(name, input);
-		}
-	}
 
-	public Toolbar addCategoryListener(CategoryListener listener) {
-		categoryListeners.add(listener);
-		return this;
-	}
-	
-	public Toolbar addDateListener(DateListener listener) {
-		dateListeners.add(listener);
-		return this;
-	}	
-	
-	public Toolbar addDimensionListener(DimensionListener listener) {
-		dimensionListeners.add(listener);
-		return this;
-	}
-	
+
+
+	/**
+	 * add a listener for updates of the variable fields
+	 * @param listener
+	 * @return
+	 */
 	public Toolbar addFieldListener(FieldListener listener) {
 		fieldListeners.add(listener);
 		return this;
 	}
 	
+	/**
+	 * add a listener for updates of the target path
+	 * @param listener
+	 * @return
+	 */
 	public Toolbar addPathListener(PathListener listener){
 		pathListeners.add(listener);
 		return this;
 	}
 	
+	/**
+	 * add a listener for the scan button
+	 * @param listener
+	 * @return
+	 */
 	public Toolbar addScanListener(ActionListener listener) {
 		scanListeners.add(listener);
 		return this;
 	}
 
+
 	
+	/**
+	 * create a auto complete text field for the category selection
+	 * @param config
+	 * @return
+	 */
 	private SelectComboBox categoryPicker(Configuration config) {
 		JSONObject elements = config.getOrCreate("app.categories",new JSONObject());
 		return new SelectComboBox(elements.keySet())
@@ -214,6 +243,10 @@ public class Toolbar extends JPanel {
 			.onDelete(this::dropCategory);
 	}
 
+	/**
+	 * create the date picker
+	 * @return
+	 */
 	private Component datePicker() {
 		date = new DateChooser();
 		Dimension dim = new Dimension(400, 250);
@@ -222,6 +255,12 @@ public class Toolbar extends JPanel {
 		return date;
 	}
 	
+	/**
+	 * delete a value (by key) from a JSONArray
+	 * @param arr
+	 * @param tx
+	 * @return
+	 */
 	private List<Object> deleteValue(JSONArray arr, String tx) {
 		for (int i = 0; i<arr.length(); i++) {
 			if (arr.get(i).equals(tx)) {
@@ -232,6 +271,10 @@ public class Toolbar extends JPanel {
 		return arr.toList();
 	}
 	
+	/**
+	 * drop a category from the category pickers list of known categories
+	 * @param catName
+	 */
 	private void dropCategory(String catName) {
 		LOG.debug("dropCategory({})",catName);
 		Object o = config.get("app.categories");
@@ -242,15 +285,28 @@ public class Toolbar extends JPanel {
 		}
 	}
 	
+	/**
+	 * get date from the date picker
+	 * @return
+	 */
 	public Date getDate() {
 		return date.getSelectedDate();
 	}
 	
+	/**
+	 * get resolution (set by resoultion form)
+	 * @return
+	 */
 	public int getResolution() {
 		return resolution;
 	}
 	
 	
+	/**
+	 * helper: returns the selector added as the second component of a JPanel
+	 * @param panel
+	 * @return null, of the panel has less than two children or the second child is no selector
+	 */
 	public SelectComboBox getSelector(JPanel panel) {
 		if (panel != null && panel.getComponentCount()>1) {
 			Component child = panel.getComponent(1);
@@ -260,6 +316,12 @@ public class Toolbar extends JPanel {
 	}
 
 	
+	/**
+	 * creates a labeled input field
+	 * @param caption
+	 * @param component
+	 * @return
+	 */
 	private JPanel input(String caption, JComponent component) {
 		component.setMaximumSize(new Dimension(600, 40));
 		component.setToolTipText(t("Press Shift + Delete to remove an entry."));
@@ -270,6 +332,10 @@ public class Toolbar extends JPanel {
 		return panel;
 	}
 	
+	/**
+	 * creates an auto-complete text field for setting the scan target path
+	 * @return
+	 */
 	private SelectComboBox pathPicker() {
 		JSONObject cats = config.getOrCreate("app.categories",new JSONObject());
 		for (String catName : cats.keySet()) {
@@ -280,23 +346,69 @@ public class Toolbar extends JPanel {
 		return new SelectComboBox(paths).onUpdateText(this::updatePath);
 	}
 	
+	/**
+	 * enables/disables the toolbars scan button
+	 * @param val
+	 */
 	public void readyToScan(boolean val) {
 		scanButton.setEnabled(val);
 	}
+	/**
+	 * create one radio button for the resoultionSelector
+	 * @param group
+	 * @param label
+	 * @param i
+	 * @return
+	 */
+	private JRadioButton resolutionButton(ButtonGroup group, JLabel label, int i) {
+		JRadioButton btn = new JRadioButton(i+" px");		
+		btn.addActionListener(ev -> {
+			resolution = i;
+			label.setText("aktuelle Auflösung: "+resolution+"px");
+		});
+		group.add(btn);
+		if (i==150) btn.setSelected(true);
+		return btn;
+	}
 
+	/**
+	 * create a small for to select the resolution for scanning
+	 * @return
+	 */
+	private JPanel resolutionSelector() {
+		ButtonGroup group = new ButtonGroup();
+		JPanel resolutionSelector = new JPanel(new BorderLayout());
+		JLabel label = new JLabel(t("current resolution")+": "+resolution+"px");
+		resolutionSelector.add(label, BorderLayout.NORTH);
+		resolutionSelector.add(resolutionButton(group,label,150),BorderLayout.WEST);
+		resolutionSelector.add(resolutionButton(group,label,300),BorderLayout.CENTER);
+		resolutionSelector.add(resolutionButton(group,label,600),BorderLayout.EAST);
+		resolutionSelector.setMaximumSize(new Dimension(600,200));
+		return resolutionSelector;
+	}
+	
+	/**
+	 * create scan button
+	 * @return
+	 */
 	private Component scanButton() {
 		scanButton = new JButton(t("scan!"));
 		scanButton.addActionListener(this::scanPressed);
 		return scanButton;
 	}
 
+	/**
+	 * notify listeners when scan button clicked
+	 * @param evt
+	 */
 	private void scanPressed(ActionEvent evt) {
 		scanListeners.forEach(l->l.actionPerformed(evt));
 	}
 	
-	
-
-	
+	/**
+	 * category updated: notify listeners and update dependent fields
+	 * @param newCat
+	 */
 	private void updateCat(String newCat) {
 		LOG.debug("updateCat({})",newCat);
 		categoryListeners.forEach(l -> l.setCategory(newCat));
@@ -334,6 +446,9 @@ public class Toolbar extends JPanel {
 
 
 
+	/**
+	 * read new dimension from dimension form, notify listeners
+	 */
 	protected void updateDimensions() {
 		LOG.debug("updateDimensions()");
 		try {
@@ -346,12 +461,21 @@ public class Toolbar extends JPanel {
 	}
 
 	
+	/**
+	 * notify listeners of changes to the variable field's values
+	 * @param name
+	 * @param val
+	 */
 	private void updateField(String name, String val) {
 		LOG.debug("updateField({},{})",name,val);
 		fieldListeners.forEach(l -> l.setField(name,val));
 	}
 
 
+	/**
+	 * notify listeners of changes to the path field
+	 * @param newPath
+	 */
 	protected void updatePath(String newPath) {
 		LOG.debug("updatePath({})",newPath);
 		pathListeners.forEach(l -> l.setPath(newPath));