/** @return A list of the settable fields. */
public static List<Field> getSettableFields() {
// Init the search in the root package.
Reflections reflections = new Reflections("org.saucistophe", new FieldAnnotationsScanner());
Set<Field> annotatedFields = reflections.getFieldsAnnotatedWith(SettingsField.class);
// Turn the set to a list to sort it.
List<Field> fieldsList = new ArrayList<>(annotatedFields);
fieldsList.sort(
(Field field1, Field field2) -> {
// Retrieve the fields info.
SettingsField fieldInfo1 = field1.getAnnotation(SettingsField.class);
SettingsField fieldInfo2 = field2.getAnnotation(SettingsField.class);
// If the name wasn't set, get the field's declared name.
String actualName1 = fieldInfo1.name().isEmpty() ? field1.getName() : fieldInfo1.name();
String actualName2 = fieldInfo2.name().isEmpty() ? field2.getName() : fieldInfo2.name();
// Elaborate a sortable string representation.
String sortableString1 = fieldInfo1.category() + "." + actualName1;
String sortableString2 = fieldInfo2.category() + "." + actualName2;
return sortableString1.compareTo(sortableString2);
});
return fieldsList;
}
/**
* Reads the settings from the settings JSON file, and call all callbacks. Typically used during
* the application init.
*/
public static void readFromFile() {
Map<String, Map<String, Object>> categories;
Gson gson = new Gson();
// Read from file
try (BufferedReader bufferedReader = new BufferedReader(new FileReader("settings.json"))) {
@SuppressWarnings("unchecked")
Map<String, Map<String, Object>> dummyCategories = gson.fromJson(bufferedReader, Map.class);
categories = dummyCategories;
// Then, for each setting, try to find its value.
for (Field settableField : getSettableFields()) {
SettingsField fieldInfo = settableField.getAnnotation(SettingsField.class);
if (categories.containsKey(fieldInfo.category())) {
Map<String, Object> category = categories.get(fieldInfo.category());
// If the name wasn't set, get the field's declared n0ame.
String actualName =
fieldInfo.name().isEmpty() ? settableField.getName() : fieldInfo.name();
if (category.containsKey(actualName)) {
// Deserialize from String.
set(
settableField,
toObject(settableField.getType(), (String) category.get(actualName)));
}
}
}
} catch (JsonSyntaxException exception) {
// On incorrect properties, log a warning.
Logger.getLogger(SettingsHandler.class.getName())
.log(Level.WARNING, "Syntax error in JSON settings file.");
Logger.getLogger(SettingsHandler.class.getName()).log(Level.WARNING, null, exception);
} catch (IOException exception) {
// If the file is not readable, or does not exist.
Logger.getLogger(SettingsHandler.class.getName())
.log(Level.WARNING, "Could not read JSON settings file.");
} finally {
triggerCallbacks();
}
}
/** Saves the state of the current settings to a file. */
public static void saveToFile() {
// Create a map of fields, indexed on categories then names.
// Those are sorted maps, to preserve alphabetical order.
SortedMap<String, SortedMap<String, Object>> categories = new TreeMap<>();
for (Field field : getSettableFields()) {
// Retrieve the field info.
SettingsField fieldInfo = field.getAnnotation(SettingsField.class);
// Create a category map, if it doesn't exist.
SortedMap<String, Object> category;
if (categories.containsKey(fieldInfo.category())) {
category = categories.get(fieldInfo.category());
} else {
category = new TreeMap<>();
categories.put(fieldInfo.category(), category);
}
// If the name wasn't set, get the field's declared name.
String actualName = fieldInfo.name().isEmpty() ? field.getName() : fieldInfo.name();
// Put the field and its value, as a string.
category.put(actualName, get(field).toString());
}
// Export the result to a json file.
GsonBuilder gsonBuilder = new GsonBuilder();
gsonBuilder.setPrettyPrinting();
Gson gson = gsonBuilder.create();
String jsonString = gson.toJson(categories);
// Write to file.
try (BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("settings.json"))) {
bufferedWriter.write(jsonString);
} catch (IOException ex) {
// If the file can't be written, it's an error.
Logger.getLogger(SettingsHandler.class.getName()).log(Level.SEVERE, null, ex);
}
}
/** Shows a swing dialog to eit the available settings. */
public static void showSettingsDialog() {
// Create a tabbed panel, one tab per category.
JTabbedPane categoriesPane = new JTabbedPane();
// A list of actions taken when validating, i.e. when setting all settings to the input values.
List<Supplier<Boolean>> actions = new ArrayList<>();
// Create a panel.
// For each available setting:
for (Field settingField : getSettableFields()) {
// Retrieve the annotation.
SettingsField fieldInfo = settingField.getAnnotation(SettingsField.class);
// Search for an existing category panel.
Integer categoryIndex = null;
for (int candidateCategoryIndex = 0;
candidateCategoryIndex < categoriesPane.getTabCount();
candidateCategoryIndex++) {
if (categoriesPane.getTitleAt(candidateCategoryIndex).equals(fieldInfo.category())) {
categoryIndex = candidateCategoryIndex;
break;
}
}
// If the category exists, retrieve its pane, otherwise create it.
JPanel categoryPanel = null;
if (categoryIndex != null) {
categoryPanel = (JPanel) categoriesPane.getComponentAt(categoryIndex);
} else {
categoryPanel = new JPanel();
categoryPanel.setLayout(new BoxLayout(categoryPanel, BoxLayout.Y_AXIS));
categoriesPane.add(categoryPanel, fieldInfo.category());
}
// If the name wasn't set, get the field's declared name.
String actualName = fieldInfo.name().isEmpty() ? settingField.getName() : fieldInfo.name();
// Prepare a label text.
String labelText = fieldInfo.description().isEmpty() ? actualName : fieldInfo.description();
// Create an optional label for component that need it.
JLabel label = new JLabel(labelText);
JComponent editionComponent;
// Handle enums.
if (settingField.getType().isEnum()) {
JComboBox<?> comboBox = new JComboBox<>(settingField.getType().getEnumConstants());
comboBox.setSelectedItem(get(settingField));
actions.add(
() -> {
set(settingField, comboBox.getSelectedItem());
return true;
});
// Add a label then the component.
editionComponent = new JPanel();
editionComponent.add(label);
editionComponent.add(comboBox);
} else {
// Handle primitive types
switch (settingField.getType().getSimpleName().toLowerCase()) {
case "boolean":
JCheckBox checkbox = new JCheckBox(labelText, (boolean) get(settingField));
editionComponent = checkbox;
actions.add(
() -> {
set(settingField, checkbox.isSelected());
return true;
});
break;
case "string":
// If there are possible values, use a combobox.
if (fieldInfo.possibleValues().length != 0) {
JComboBox<String> comboBox = new JComboBox<>(fieldInfo.possibleValues());
actions.add(
() -> {
set(settingField, comboBox.getSelectedItem());
return true;
});
// Add a label then the component.
editionComponent = new JPanel();
editionComponent.add(label);
editionComponent.add(comboBox);
} else {
// Otherwise, use a simple text field.
JTextField textField = new JTextField((String) get(settingField));
actions.add(
() -> {
set(settingField, textField.getText());
return true;
});
// Add a label then the component.
editionComponent = new JPanel();
editionComponent.add(label);
editionComponent.add(textField);
}
break;
case "int":
case "integer":
int currentIntValue = (int) get(settingField);
SpinnerModel spinnerModel =
new SpinnerNumberModel(
currentIntValue, fieldInfo.minValue(), fieldInfo.maxValue(), 1);
JSpinner spinner = new JSpinner(spinnerModel);
spinner.setValue(currentIntValue);
actions.add(
() -> {
set(settingField, spinner.getValue());
return true;
});
// Add a label then the component.
editionComponent = new JPanel();
editionComponent.add(label);
editionComponent.add(spinner);
break;
default:
editionComponent = new JTextField("Unknown setting type");
editionComponent.setEnabled(false);
break;
}
}
categoryPanel.add(editionComponent);
// Add a fancy tooltip.
if (fieldInfo.description() != null && !fieldInfo.description().isEmpty()) {
editionComponent.setToolTipText(fieldInfo.description());
}
}
// Put the panel in a modal frame.
JDialog dialog = new JDialog((Frame) null, "Settings", true);
dialog.add(categoriesPane);
// Add a validation and cancel button.
JPanel bottomButtons = new JPanel(new FlowLayout(TRAILING));
dialog.add(bottomButtons, BorderLayout.SOUTH);
JButton okButton = new JButton("OK");
{
okButton.addActionListener(
e -> {
for (Supplier<Boolean> action : actions) {
action.get();
}
saveToFile();
// Call all callbacks on all categories.
Set<Method> callbacks = getSettingsCallbacks();
callbacks
.stream()
.forEach(
m -> {
try {
m.invoke(null);
} catch (IllegalAccessException
| IllegalArgumentException
| InvocationTargetException ex) {
Logger.getLogger(SettingsHandler.class.getName())
.log(Level.SEVERE, null, ex);
}
});
dialog.dispose();
});
}
bottomButtons.add(okButton);
JButton cancelButton = new JButton("Cancel");
{
cancelButton.addActionListener(
e -> {
dialog.dispose();
});
}
bottomButtons.add(cancelButton);
dialog.pack();
dialog.setVisible(true);
}