Create directory dialog option for loading the custom rules

Signed-off-by: Enri Ozuni <enriozuni@hotmail.com>

plugins/de.cognicrypt.staticanalyzer/src/de/cognicrypt/staticanalyzer/StaticAnalyzerPreferences.java

@@ -20,15 +20,18 @@
 import org.eclipse.swt.custom.TableEditor;
 import org.eclipse.swt.events.SelectionAdapter;
 import org.eclipse.swt.events.SelectionEvent;
+import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
 import org.eclipse.swt.widgets.Button;
 import org.eclipse.swt.widgets.Combo;
 import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.DirectoryDialog;
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.swt.widgets.Group;
 import org.eclipse.swt.widgets.Label;
 import org.eclipse.swt.widgets.Listener;
 import org.eclipse.swt.widgets.TableItem;
+import org.eclipse.swt.widgets.Text;
 import org.eclipse.ui.IWorkbenchWindow;
 import org.eclipse.ui.PlatformUI;
 import org.osgi.service.prefs.BackingStoreException;
@@ -52,6 +55,7 @@ public class StaticAnalyzerPreferences extends PreferenceListener {
 	private Button analyseDependenciesCheckBox;
 	private Button addNewRulesetButton, selectCustomRulesCheckBox;
 	private CheckboxTableViewer table;
+	private Button customRulesButton;
 
 	private Combo CGSelection;
 	private Combo forbidden;
@@ -253,6 +257,44 @@ public void handleEvent(Event e) {
 				addNewRuleset();
 			}
 		});
+
+		final Text text = new Text(staticAnalysisGroup, SWT.BORDER);
+	    GridData data = new GridData(GridData.FILL_HORIZONTAL);
+	    data.horizontalSpan = 4;
+	    text.setLayoutData(data);
+		customRulesButton = new Button(staticAnalysisGroup, SWT.PUSH);
+		customRulesButton.setText("Browse custom rules directory");
+		customRulesButton.addSelectionListener(new SelectionAdapter() {
+			public void widgetSelected(SelectionEvent event) {
+				DirectoryDialog dlg = new DirectoryDialog(staticAnalysisGroup.getShell());
+
+				// Set the initial filter path according
+				// to anything they've selected or typed in
+				dlg.setFilterPath(text.getText());
+
+				// Change the title bar text
+				dlg.setText("SWT's DirectoryDialog");
+
+				// Customizable message displayed in the dialog
+				dlg.setMessage("Select a directory");
+
+				// Calling open() will open and run the dialog.
+				// It will return the selected directory, or
+				// null if user cancels
+				String dir = dlg.open();
+				if (dir != null) {
+					// Set the text box to the new selection
+					text.setText(dir);
+					if (ArtifactUtils.downloadRulesets(dir)) {
+						Activator.getDefault().logInfo("Rulesets updated.");
+					}
+					Ruleset newRuleset = new Ruleset(dir);
+					modifyRulesTable(newRuleset);
+					listOfRulesets.add(newRuleset);
+				}
+			}
+	    });
+
 		selectCustomRulesCheckBox = new Button(staticAnalysisGroup, SWT.CHECK);
 		selectCustomRulesCheckBox.setText("Select Custom Rules");
 		selectCustomRulesCheckBox.addListener(SWT.Selection, new Listener() {