FYI: JComponent.getListeners()

FYI: JComponent.getListeners()

[David Gilbert]

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I added some checks for this method:

2005-11-23  David Gilbert  <david.gilbert@object-refinery.com>

    * gnu/testlet/javax/swing/JComponent/getListeners.java: New test.

Regards,

Dave

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Index: gnu/testlet/javax/swing/JComponent/getListeners.java
===================================================================
RCS file: gnu/testlet/javax/swing/JComponent/getListeners.java
diff -N gnu/testlet/javax/swing/JComponent/getListeners.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ gnu/testlet/javax/swing/JComponent/getListeners.java	23 Nov 2005 15:29:47 -0000
@@ -0,0 +1,101 @@
+// Tags: JDK1.3
+
+// Copyright (C) 2005 David Gilbert  <david.gilbert@object-refinery.com>
+
+// Mauve is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// Mauve is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Mauve; see the file COPYING.  If not, write to
+// the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 
+// Boston, MA 02110-1301 USA.
+
+package gnu.testlet.javax.swing.JComponent;
+
+import gnu.testlet.TestHarness;
+import gnu.testlet.Testlet;
+
+import java.awt.event.ContainerListener;
+import java.awt.event.FocusListener;
+import java.util.EventListener;
+
+import javax.swing.JComponent;
+import javax.swing.event.AncestorEvent;
+import javax.swing.event.AncestorListener;
+
+/**
+ * Some tests for the <code>getListeners(Class)</code> method in the 
+ * {@link JComponent} class.
+ */
+public class getListeners implements Testlet, AncestorListener {
+
+  class TestComponent extends JComponent
+  {
+  }
+
+  /**
+   * Runs the test using the specified harness.
+   * 
+   * @param harness  the test harness (<code>null</code> not permitted).
+   */
+  public void test(TestHarness harness)      
+  {
+    TestComponent c = new TestComponent();
+    c.addAncestorListener(this);
+    EventListener[] listeners = c.getListeners(AncestorListener.class);
+    harness.check(listeners.length, 1);
+    harness.check(listeners[0], this);
+    // try a listener type that isn't registered
+    listeners = c.getListeners(FocusListener.class);
+    harness.check(listeners.length, 0);
+    c.removeAncestorListener(this);
+    listeners = c.getListeners(AncestorListener.class);
+    harness.check(listeners.length, 0);
+    
+    // try a null argument
+    boolean pass = false;
+    try
+    {
+      listeners = c.getListeners(null);
+    }
+    catch (NullPointerException e) 
+    {
+      pass = true;    
+    }
+    harness.check(pass);
+    
+    // try a class that isn't a listener
+    pass = false;
+    try
+    {
+      listeners = c.getListeners(Integer.class);
+    }
+    catch (ClassCastException e) 
+    {
+      pass = true;
+    }
+    harness.check(pass);
+  }
+  
+  public void ancestorMoved(AncestorEvent e)
+  {
+    // ignored
+  }
+
+  public void ancestorAdded(AncestorEvent e)
+  {
+    // ignored
+  }
+  
+  public void ancestorRemoved(AncestorEvent e)
+  {
+    // ignored
+  }
+}