add live load and unload

src/main/java/org/nwapw/abacus/Abacus.java

@@ -9,7 +9,7 @@ import org.nwapw.abacus.parsing.ShuntingYardParser;
 import org.nwapw.abacus.parsing.TreeBuilder;
 import org.nwapw.abacus.plugin.ClassFinder;
 import org.nwapw.abacus.plugin.PluginManager;
-import org.nwapw.abacus.plugin.StandardPlugin;
+//import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.NumberReducer;
 import org.nwapw.abacus.tree.TreeNode;
 
@@ -67,16 +67,22 @@ public class Abacus {
 
         pluginManager.addListener(lexerTokenizer);
         pluginManager.addListener(shuntingYardParser);
-        pluginManager.addInstantiated(new StandardPlugin(pluginManager));
+        //pluginManager.addInstantiated(new StandardPlugin(pluginManager));
+        /*
         try {
             ClassFinder.loadJars("plugins")
                     .forEach(plugin -> pluginManager.addClass(plugin));
         } catch (IOException | ClassNotFoundException e) {
             e.printStackTrace();
-        }
+        }//*/
         pluginManager.load();
     }
-
+    public void loadClass(Class<?> newClass){
+        pluginManager.addClass(newClass);
+    }
+    public void unloadClass(Class<?> newClass){
+        pluginManager.removeClass(newClass);
+    }
     public static void main(String[] args) {
         AbacusApplication.launch(AbacusApplication.class, args);
     }

src/main/java/org/nwapw/abacus/fx/AbacusApplication.java

@@ -6,6 +6,10 @@ import javafx.scene.Parent;
 import javafx.scene.Scene;
 import javafx.stage.Stage;
 
+/**
+ * The main application class for JavaFX responsible for loading
+ * and displaying the fxml file.
+ */
 public class AbacusApplication extends Application {
 
     @Override

src/main/java/org/nwapw/abacus/fx/AbacusController.java

@@ -8,12 +8,25 @@ import javafx.scene.text.Text;
 import javafx.util.Callback;
 import org.nwapw.abacus.Abacus;
 import org.nwapw.abacus.number.NumberInterface;
+import org.nwapw.abacus.plugin.ClassFinder;
 import org.nwapw.abacus.tree.TreeNode;
 
+import java.io.IOException;
 
+
+/**
+ * The controller for the abacus FX UI, responsible
+ * for all the user interaction.
+ */
 public class AbacusController {
 
+    /**
+     * Constant string that is displayed if the text could not be lexed or parsed.
+     */
     private static final String ERR_SYNTAX = "Syntax Error";
+    /**
+     * Constant string that is displayed if the tree could not be reduced.
+     */
     private static final String ERR_EVAL = "Evaluation Error";
 
     @FXML
@@ -32,9 +45,22 @@ public class AbacusController {
     private Button inputButton;
     @FXML
     private ComboBox<String> numberImplementationBox;
+    @FXML
+    private Button loadButton;
+    @FXML
+    private Button unloadButton;
+    @FXML
+    private TextField loadField;
 
+    /**
+     * The list of history entries, created by the users.
+     */
     private ObservableList<HistoryModel> historyData;
 
+    /**
+     * The abacus instance used for calculations and all
+     * other main processing code.
+     */
     private ObservableList<String> numberImplementationOptions;
 
     private Abacus abacus;
@@ -89,5 +115,38 @@ public class AbacusController {
         inputButton.setDisable(false);
         inputField.setText("");
     }
+    @FXML
+    private void loadClass(){
+        try {
+            for(Class<?> plugin :ClassFinder.loadJars("plugins")){
+                String name = "";
+                //String name = plugin.getName();
+                while(!(name.indexOf('/') ==-1)){
+                    name=name.substring(name.indexOf('/')+1);
+                }
+                if(loadField.getText().equals("")||loadField.getText().equals(name)||(loadField.getText()+".class").equals(name)){
+                    //abacus.loadClass(plugin);
+                }
+            }
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+    @FXML
+    private void unloadClass(){
+        try {
+            for(Class<?> plugin :ClassFinder.loadJars("plugins")){
+                String name = plugin.getName();
+                while(!(name.indexOf('/') ==-1)){
+                    name=name.substring(name.indexOf('/')+1);
+                }
+                if(loadField.getText().equals("")||loadField.getText().equals(name)||(loadField.getText()+".class").equals(name)){
+                    //abacus.unloadClass(plugin);
+                }
+            }
+        } catch (IOException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
 
 }

src/main/java/org/nwapw/abacus/fx/CopyableCell.java

@@ -6,8 +6,17 @@ import javafx.scene.input.MouseEvent;
 import java.awt.*;
 import java.awt.datatransfer.StringSelection;
 
+/**
+ * A cell that copies its value to the clipboard
+ * when double clicked.
+ * @param <S> The type of the table view generic type.
+ * @param <T> The type of the value contained in the cell.
+ */
 public class CopyableCell<S, T> extends TableCell<S, T> {
 
+    /**
+     * Creates a new copyable cell.
+     */
     public CopyableCell(){
         addEventFilter(MouseEvent.MOUSE_CLICKED, event -> {
             if(event.getClickCount() == 2){

src/main/java/org/nwapw/abacus/fx/HistoryModel.java

@@ -3,12 +3,33 @@ package org.nwapw.abacus.fx;
 import javafx.beans.property.SimpleStringProperty;
 import javafx.beans.property.StringProperty;
 
+/**
+ * The data model used for storing history entries.
+ */
 public class HistoryModel {
 
+    /**
+     * The property used for displaying the column
+     * for the user input.
+     */
     private final StringProperty input;
+    /**
+     * The property used for displaying the column
+     * that contains the parsed input.
+     */
     private final StringProperty parsed;
+    /**
+     * The property used for displaying the column
+     * that contains the program output.
+     */
     private final StringProperty output;
 
+    /**
+     * Creates a new history model with the given variables.
+     * @param input the user input
+     * @param parsed the parsed input
+     * @param output the program output.
+     */
     public HistoryModel(String input, String parsed, String output){
         this.input = new SimpleStringProperty();
         this.parsed = new SimpleStringProperty();
@@ -18,23 +39,47 @@ public class HistoryModel {
         this.output.setValue(output);
     }
 
+    /**
+     * Gets the input property.
+     * @return the input property.
+     */
     public StringProperty inputProperty() {
         return input;
     }
+    /**
+     * Gets the input.
+     * @return the input.
+     */
     public String getInput() {
         return input.get();
     }
 
+    /**
+     * Gets the parsed input property.
+     * @return the parsed input property.
+     */
     public StringProperty parsedProperty() {
         return parsed;
     }
+    /**
+     * Gets the parsed input.
+     * @return the parsed input.
+     */
     public String getParsed() {
         return parsed.get();
     }
 
+    /**
+     * Gets the output property.
+     * @return the output property.
+     */
     public StringProperty outputProperty() {
         return output;
     }
+    /**
+     * Gets the program output.
+     * @return the output.
+     */
     public String getOutput() {
         return output.get();
     }

src/main/java/org/nwapw/abacus/number/PreciseNumber.java

@@ -1,9 +1,12 @@
 package org.nwapw.abacus.number;
 
 import java.math.BigDecimal;
-import java.math.MathContext;
 import java.math.RoundingMode;
 
+/**
+ * A number that uses a BigDecimal to store its value,
+ * leading to infinite possible precision.
+ */
 public class PreciseNumber implements NumberInterface {
 
     /**

src/main/java/org/nwapw/abacus/plugin/PluginManager.java

@@ -140,6 +140,11 @@ public class PluginManager {
         plugins.add(plugin);
         loadedPluginClasses.add(plugin.getClass());
     }
+    public void removeInstantiated(Plugin plugin){
+        if (loadedPluginClasses.contains(plugin.getClass())) return;
+        plugins.remove(plugin);
+        loadedPluginClasses.remove(plugin.getClass());
+    }
 
     /**
      * Instantiates a class of plugin, and adds it to this
@@ -155,6 +160,14 @@ public class PluginManager {
             e.printStackTrace();
         }
     }
+    public void removeClass(Class<?> newClass){
+        if (!Plugin.class.isAssignableFrom(newClass) || newClass == Plugin.class) return;
+        try {
+            removeInstantiated((Plugin) newClass.getConstructor(PluginManager.class).newInstance(this));
+        } catch (InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
 
     /**
      * Loads all the plugins in the PluginManager.

src/main/resources/abacus.fxml

@@ -46,6 +46,9 @@
                     <padding><Insets left="10" right="10" top="10" bottom="10"/></padding>
                     <Label text="Number Implementation" GridPane.columnIndex="0" GridPane.rowIndex="0"/>
                     <ComboBox fx:id="numberImplementationBox" GridPane.columnIndex="1" GridPane.rowIndex="0"/>
+                    <Button fx:id="loadButton" text="Load" GridPane.rowIndex="1" GridPane.columnIndex="0" maxWidth = "Infinity" onAction="#loadClass"/>
+                    <Button fx:id="unloadButton" text="Unload" GridPane.rowIndex="1" GridPane.columnIndex="1" maxWidth = "Infinity" onAction="#unloadClass"/>
+                    <TextField fx:id="loadField" GridPane.rowIndex="1" GridPane.columnIndex="2"/>
                 </GridPane>
             </Tab>
         </TabPane>