Changed UserNotifier from interface to abstract class.

Author: bitron

app/src/processing/app/helpers/BasicUserNotifier.java

@@ -2,11 +2,7 @@
 
 import static processing.app.I18n._;
 
-public class BasicUserNotifier implements UserNotifier {
-
-  public void showError(String title, String message, Throwable e) {
-    showError(title, message, e, 1);
-  }
+public class BasicUserNotifier extends UserNotifier {
 
   /**
    * Show an error message that's actually fatal to the program.
@@ -28,4 +24,15 @@ public void showMessage(String title, String message) {
     System.out.println(title + ": " + message);
   }
 
+  /**
+   * Non-fatal error message with optional stack trace side dish.
+   */
+  public void showWarning(String title, String message, Exception e) {
+    if (title == null) title = _("Warning");
+
+    System.out.println(title + ": " + message);
+
+    if (e != null) e.printStackTrace();
+  }
+
 }

app/src/processing/app/helpers/GUIUserNotifier.java

@@ -6,11 +6,7 @@
 
 import javax.swing.JOptionPane;
 
-public class GUIUserNotifier implements UserNotifier {
-
-  public void showError(String title, String message, Throwable e) {
-    showError(title, message, e, 1);
-  }
+public class GUIUserNotifier extends UserNotifier {
 
   /**
    * Show an error message that's actually fatal to the program.
@@ -38,4 +34,16 @@ public void showMessage(String title, String message) {
                                   JOptionPane.INFORMATION_MESSAGE);
   }
 
+  /**
+   * Non-fatal error message with optional stack trace side dish.
+   */
+  public void showWarning(String title, String message, Exception e) {
+    if (title == null) title = _("Warning");
+
+    JOptionPane.showMessageDialog(new Frame(), message, title,
+                                  JOptionPane.WARNING_MESSAGE);
+
+    if (e != null) e.printStackTrace();
+  }
+
 }

app/src/processing/app/helpers/UserNotifier.java

@@ -1,11 +1,19 @@
 package processing.app.helpers;
 
-public interface UserNotifier {
+public abstract class UserNotifier {
 
-  public void showError(String title, String message, Throwable e);
+  public void showError(String title, String message, int exit_code) {
+    showError(title, message, null, exit_code);
+  }
 
-  public void showError(String title, String message, Throwable e, int exit_code);
+  public void showError(String title, String message, Throwable e) {
+    showError(title, message, e, 1);
+  }
 
-  public void showMessage(String title, String message);
+  public abstract void showError(String title, String message, Throwable e, int exit_code);
+
+  public abstract void showMessage(String title, String message);
+
+  public abstract void showWarning(String title, String message, Exception e);
 
 }