svn commit: r989817 - in /pivot/trunk/core/src/org/apache/pivot: collections/Collection.java util/ListenerList.java

[gb...@apache.org]

Author: gbrown
Date: Thu Aug 26 16:50:04 2010
New Revision: 989817

URL: http://svn.apache.org/viewvc?rev=989817&view=rev
Log:
Resolve PIVOT-611.

Modified:
    pivot/trunk/core/src/org/apache/pivot/collections/Collection.java
    pivot/trunk/core/src/org/apache/pivot/util/ListenerList.java

Modified: pivot/trunk/core/src/org/apache/pivot/collections/Collection.java
URL: http://svn.apache.org/viewvc/pivot/trunk/core/src/org/apache/pivot/collections/Collection.java?rev=989817&r1=989816&r2=989817&view=diff
==============================================================================
--- pivot/trunk/core/src/org/apache/pivot/collections/Collection.java (original)
+++ pivot/trunk/core/src/org/apache/pivot/collections/Collection.java Thu Aug 26 16:50:04 2010
@@ -30,6 +30,10 @@ public interface Collection<T> extends I
 
     /**
      * Tests the emptiness of the collection.
+     *
+     * @return
+     * <tt>true</tt> if the collection contains no elements; <tt>false</tt>,
+     * otherwise.
      */
     public boolean isEmpty();
 

Modified: pivot/trunk/core/src/org/apache/pivot/util/ListenerList.java
URL: http://svn.apache.org/viewvc/pivot/trunk/core/src/org/apache/pivot/util/ListenerList.java?rev=989817&r1=989816&r2=989817&view=diff
==============================================================================
--- pivot/trunk/core/src/org/apache/pivot/util/ListenerList.java (original)
+++ pivot/trunk/core/src/org/apache/pivot/util/ListenerList.java Thu Aug 26 16:50:04 2010
@@ -140,6 +140,36 @@ public abstract class ListenerList<T> im
         }
     }
 
+    /**
+     * Tests the existence of a listener in the list.
+     *
+     * @param listener
+     *
+     * @return
+     * <tt>true</tt> if the listener exists in the list; <tt>false</tt>,
+     * otherwise.
+     */
+    public boolean contains(T listener) {
+        if (listener == null) {
+            throw new IllegalArgumentException("listener is null.");
+        }
+
+        Node node = first;
+        while (node != null
+            && node.listener != listener) {
+            node = node.next;
+        }
+
+        return (node != null);
+    }
+
+    /**
+     * Tests the emptiness of the list.
+     *
+     * @return
+     * <tt>true</tt> if the list contains no listeners; <tt>false</tt>,
+     * otherwise.
+     */
     public boolean isEmpty() {
         return (first == null);
     }