Fixes issue 3378 by adding getHandlerCount()
Review by:rjrjr

git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4885 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/src/com/google/gwt/user/client/ui/Widget.java b/user/src/com/google/gwt/user/client/ui/Widget.java
index 5933672..f3aa9d9 100644
--- a/user/src/com/google/gwt/user/client/ui/Widget.java
+++ b/user/src/com/google/gwt/user/client/ui/Widget.java
@@ -22,6 +22,7 @@
 import com.google.gwt.event.shared.HandlerManager;
 import com.google.gwt.event.shared.HandlerRegistration;
 import com.google.gwt.event.shared.HasHandlers;
+import com.google.gwt.event.shared.GwtEvent.Type;
 import com.google.gwt.user.client.DOM;
 import com.google.gwt.user.client.Event;
 import com.google.gwt.user.client.EventListener;
@@ -196,6 +197,16 @@
   }
 
   /**
+   * Gets the number of handlers listening to the event type.
+   * 
+   * @param type the event type
+   * @return the number of registered handlers
+   */
+  protected int getHandlerCount(Type<?> type) {
+    return handlerManager == null ? 0 : handlerManager.getHandlerCount(type);
+  }
+
+  /**
    * Has this widget ever been attached?
    * 
    * @return true if this widget ever been attached to the DOM, false otherwise
diff --git a/user/test/com/google/gwt/user/UISuite.java b/user/test/com/google/gwt/user/UISuite.java
index d043f86..f5b3da7 100644
--- a/user/test/com/google/gwt/user/UISuite.java
+++ b/user/test/com/google/gwt/user/UISuite.java
@@ -22,6 +22,7 @@
 import com.google.gwt.user.client.WindowTest;
 import com.google.gwt.user.client.ui.AbsolutePanelTest;
 import com.google.gwt.user.client.ui.AnchorTest;
+import com.google.gwt.user.client.ui.WidgetTest;
 import com.google.gwt.user.client.ui.ButtonTest;
 import com.google.gwt.user.client.ui.CaptionPanelTest;
 import com.google.gwt.user.client.ui.CheckBoxTest;
@@ -164,6 +165,7 @@
     suite.addTestSuite(ClassInitTest.class);
     suite.addTestSuite(DateChangeEventTest.class);
     suite.addTestSuite(CreateEventTest.class);
+    suite.addTestSuite(WidgetTest.class);
     return suite;
   }
 }
diff --git a/user/test/com/google/gwt/user/client/ui/WidgetTest.java b/user/test/com/google/gwt/user/client/ui/WidgetTest.java
new file mode 100644
index 0000000..109ce8e
--- /dev/null
+++ b/user/test/com/google/gwt/user/client/ui/WidgetTest.java
@@ -0,0 +1,61 @@
+/*

+ * Copyright 2009 Google Inc.

+ * 

+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not

+ * use this file except in compliance with the License. You may obtain a copy of

+ * the License at

+ * 

+ * http://www.apache.org/licenses/LICENSE-2.0

+ * 

+ * Unless required by applicable law or agreed to in writing, software

+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

+ * License for the specific language governing permissions and limitations under

+ * the License.

+ */

+package com.google.gwt.user.client.ui;

+

+import com.google.gwt.event.dom.client.ChangeEvent;

+import com.google.gwt.event.dom.client.ClickEvent;

+import com.google.gwt.event.dom.client.ClickHandler;

+import com.google.gwt.event.shared.HandlerRegistration;

+import com.google.gwt.junit.client.GWTTestCase;

+

+/**

+ * Tests the basic widget infrastructure.

+ * 

+ */

+public class WidgetTest extends GWTTestCase {

+

+  ClickHandler handlerA = new ClickHandler() {

+

+    public void onClick(ClickEvent event) {

+    }

+  };

+

+  ClickHandler handlerB = new ClickHandler() {

+

+    public void onClick(ClickEvent event) {

+    }

+  };

+

+  @Override

+  public String getModuleName() {

+    return "com.google.gwt.user.User";

+  }

+

+  public void testHandlerCount() {

+    Widget a = new Widget();

+    assertEquals(0, a.getHandlerCount(ClickEvent.getType()));

+    HandlerRegistration r1 = a.addDomHandler(handlerA, ClickEvent.getType());

+    assertEquals(1, a.getHandlerCount(ClickEvent.getType()));

+    HandlerRegistration r2 = a.addHandler(handlerB, ClickEvent.getType());

+    assertEquals(2, a.getHandlerCount(ClickEvent.getType()));

+

+    assertEquals(0, a.getHandlerCount(ChangeEvent.getType()));

+    r1.removeHandler();

+    r2.removeHandler();

+    assertEquals(0, a.getHandlerCount(ClickEvent.getType()));

+  }

+

+}