Added more documentation to PerfinApp.java, and added JSON export.

src/main/java/com/andrewlalis/perfin/PerfinApp.java

@@ -30,7 +30,9 @@ import java.util.function.Consumer;
 public class PerfinApp extends Application {
     private static final Logger log = LoggerFactory.getLogger(PerfinApp.class);
     public static final Path APP_DIR = Path.of(System.getProperty("user.home", "."), ".perfin");
+    /** The singleton instance of the application. */
     public static PerfinApp instance;
+    /** The singleton profile loader for the application. */
     public static ProfileLoader profileLoader;
 
     /**
@@ -66,20 +68,28 @@ public class PerfinApp extends Application {
         }
     }
 
+    /**
+     * Part of the app's startup, where the main scene is initialized.
+     * @param stage The JavaFX stage where the scene will be placed.
+     * @param msgConsumer A message consumer to relay status messages to the user.
+     */
     private void initMainScreen(Stage stage, Consumer<String> msgConsumer) {
         msgConsumer.accept("Initializing main screen.");
         Platform.runLater(() -> {
             stage.hide();
             Scene mainViewScene = SceneUtil.load("/main-view.fxml");
-            mainViewScene.getStylesheets().addAll(
+            SceneUtil.addStylesheets(mainViewScene, "/style/base.css");
-                    PerfinApp.class.getResource("/style/base.css").toExternalForm()
-            );
             stage.setScene(mainViewScene);
             stage.setTitle("Perfin");
             stage.getIcons().add(ImageCache.getLogo256());
         });
     }
 
+    /**
+     * Part of the app's startup, where all the app's routes to various views
+     * are defined.
+     * @param msgConsumer A message consumer to relay status messages to the user.
+     */
     private static void defineRoutes(Consumer<String> msgConsumer) {
         msgConsumer.accept("Initializing application views.");
         Platform.runLater(() -> {
@@ -111,6 +121,11 @@ public class PerfinApp extends Application {
         });
     }
 
+    /**
+     * A part of the app's startup which ensures that the main directory exists.
+     * @param msgConsumer A message consumer to relay status messages to the user.
+     * @throws Exception If file operations fail.
+     */
     private static void initAppDir(Consumer<String> msgConsumer) throws Exception {
         msgConsumer.accept("Validating application files.");
         if (Files.notExists(APP_DIR)) {
@@ -124,6 +139,13 @@ public class PerfinApp extends Application {
         }
     }
 
+    /**
+     * The final part of the app's startup sequence, where the last profile is
+     * loaded and set as the current profile. Calling `Profile.setCurrent`
+     * triggers many components to refresh their data for the current profile.
+     * @param msgConsumer A message consumer to relay status messages to the user.
+     * @throws Exception If the profile could not be loaded for some reason.
+     */
     private static void loadLastUsedProfile(Consumer<String> msgConsumer) throws Exception {
         String lastProfile = ProfileLoader.getLastProfile();
         msgConsumer.accept("Loading the most recent profile: \"" + lastProfile + "\".");
@@ -135,6 +157,9 @@ public class PerfinApp extends Application {
         }
     }
 
+    /**
+     * Loads all application fonts from the bundled resource files.
+     */
     private static void loadFonts() {
         List<String> fontResources = List.of(
                 "/font/JetBrainsMono-2.304/fonts/ttf/JetBrainsMono-Regular.ttf",

src/main/java/com/andrewlalis/perfin/control/SqlConsoleViewController.java

@@ -5,6 +5,10 @@ import com.andrewlalis.perfin.data.SavedQueryRepository;
 import com.andrewlalis.perfin.data.impl.JdbcDataSource;
 import com.andrewlalis.perfin.data.util.FileUtil;
 import com.andrewlalis.perfin.model.Profile;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import javafx.fxml.FXML;
 import javafx.scene.Node;
 import javafx.scene.control.*;
@@ -24,6 +28,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.sql.ResultSet;
 import java.sql.SQLException;
+import java.sql.Types;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Optional;
@@ -145,8 +150,7 @@ public class SqlConsoleViewController implements RouteSelectionListener {
             if (name.endsWith(".csv")) {
                 writeQueryResultsToCsv(rs, chosenFile.toPath());
             } else if (name.endsWith(".json")) {
-//                writeQueryResultsToJson(rs, chosenFile.toPath());
+                writeQueryResultsToJson(rs, chosenFile.toPath());
-                Popups.message(sqlEditorTextArea, "JSON not yet supported.");
             }
         } catch (Exception e) {
             Popups.error(sqlEditorTextArea, e);
@@ -173,6 +177,33 @@ public class SqlConsoleViewController implements RouteSelectionListener {
         }
     }
 
+    private void writeQueryResultsToJson(ResultSet rs, Path file) throws SQLException, IOException {
+        ObjectMapper mapper = new ObjectMapper();
+        JsonNodeFactory nf = mapper.getNodeFactory();
+        final int columnCount = rs.getMetaData().getColumnCount();
+        try (
+                var out = Files.newOutputStream(file);
+                var arrayWriter = mapper.writerWithDefaultPrettyPrinter().writeValuesAsArray(out)
+        ) {
+            while (rs.next()) {
+                ObjectNode obj = mapper.createObjectNode();
+                for (int i = 1; i <= columnCount; i++) {
+                    String label = rs.getMetaData().getColumnLabel(i);
+                    int type = rs.getMetaData().getColumnType(i);
+                    JsonNode valueNode = switch (type) {
+                        case Types.INTEGER | Types.BIGINT -> nf.numberNode(rs.getLong(i));
+                        case Types.FLOAT | Types.DECIMAL -> nf.numberNode(rs.getDouble(i));
+                        case Types.NUMERIC -> nf.numberNode(rs.getBigDecimal(i));
+                        case Types.BOOLEAN -> nf.booleanNode(rs.getBoolean(i));
+                        default -> nf.textNode(rs.getString(i));
+                    };
+                    obj.set(label, valueNode);
+                }
+                arrayWriter.write(obj);
+            }
+        }
+    }
+
     private void refreshSavedQueries() {
         savedQueriesVBox.getChildren().clear();
         List<String> savedQueries = Profile.getCurrent().dataSource()

src/main/java/module-info.java

@@ -14,6 +14,7 @@ module com.andrewlalis.perfin {
     exports com.andrewlalis.perfin to javafx.graphics;
     exports com.andrewlalis.perfin.view to javafx.graphics;
     exports com.andrewlalis.perfin.model to javafx.graphics;
+    exports com.andrewlalis.perfin.data.util to javafx.graphics;
 
     opens com.andrewlalis.perfin.control to javafx.fxml;
     opens com.andrewlalis.perfin.view to javafx.fxml;