Adds generic class Import PopUp

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/view/popups/ImportPopUp.java

@@ -0,0 +1,86 @@
+package de.tu_darmstadt.tk.SmartHomeNetworkSim.view.popups;
+
+import java.io.File;
+
+import javax.swing.JFileChooser;
+import javax.swing.JPanel;
+
+import de.tu_darmstadt.tk.SmartHomeNetworkSim.control.ClassImportException;
+import de.tu_darmstadt.tk.SmartHomeNetworkSim.control.ImportController;
+import de.tu_darmstadt.tk.SmartHomeNetworkSim.view.util.JavaFileFilter;
+
+/**
+ * Import PopUp which allows selection of a java File which should be compiled and be a subclass of T. Throws ClassImportExceptions on failures, and returns null if importing was aborted.
+ *
+ * @author Andreas T. Meyer-Berg
+ * @param <T> Interface/Class which should be superclass of imported
+ */
+public class ImportPopUp<T> {
+
+	private JPanel panel;
+	private Class<T> classType;
+	
+	/**
+	 * Creates ImportPopUp
+	 * @param panel position relative to this panel
+	 * @param classType superclass/interface of the imported class
+	 */
+	public ImportPopUp (JPanel panel, Class<T> classType) {
+		this.panel = panel;
+		this.classType = classType;
+	}
+	
+	/**
+	 * Creates PopUp to import an java File, returns the class of this file
+	 * 
+	 * @return Class of imported File, which is subclass of T, null on abort
+	 * @throws ClassImportException on Errors
+	 */
+	public  Class<? extends T> showPopUp() throws ClassImportException{
+		JFileChooser fc = new JFileChooser(new File(System.getProperty("user.dir")));
+		fc.setFileFilter(new JavaFileFilter());
+		int returnVal = fc.showOpenDialog(panel);
+
+        if (returnVal == JFileChooser.APPROVE_OPTION) {
+        	/**
+        	 * selected File
+        	 */
+            File file = fc.getSelectedFile();
+            String[] parts = file.getName().split("[.]");
+            if(parts.length <= 1)
+            	throw new ClassImportException("Invalid fileName: "+file.getName()+" missing Name.java Format");
+            /**
+             * Check the file type ending
+             */
+            String ending = parts[parts.length-1].toLowerCase();
+            if(ending.equals("java")){
+            	// Compile source file.
+            	/**
+            	 * Imported Java Class
+            	 */
+            	Class<?> imported = null;
+				imported = ImportController.importJavaClass(file);
+				
+				if(imported == null)
+					throw new ClassImportException("Importing javaClass failed");
+
+				try {
+					/**
+					 * If valid subclass
+					 */
+					return imported.asSubclass(classType);	
+				} catch (ClassCastException e) {
+					throw new ClassImportException("Class does not implement "+classType.getSimpleName());
+				}
+            }else{
+            	/**
+            	 * Invalid file name
+            	 */
+            	throw new ClassImportException("Invalid fileEnding: \""+ending+"\" instead of \"java\"");
+            }
+        } else {
+           //Importing Cancelled by user
+        	return null;
+        }
+	}
+}