#1410 getListeners method for all classes that have addListener/removeListener

svn changeset:18390/svn branch:6.6

1 files changed, 22 insertions, 0 deletions

diff --git a/src/com/vaadin/data/util/AbstractProperty.java b/src/com/vaadin/data/util/AbstractProperty.java
index 2b3fcf2c93..953ab664a3 100644
--- a/src/com/vaadin/data/util/AbstractProperty.java
+++ b/src/com/vaadin/data/util/AbstractProperty.java
@@ -1,5 +1,7 @@
 package com.vaadin.data.util;
 
+import java.util.Collection;
+import java.util.Collections;
 import java.util.LinkedList;
 
 import com.vaadin.data.Property;
@@ -191,4 +193,24 @@ public abstract class AbstractProperty implements Property,
         }
     }
 
+    public Collection<?> getListeners(Class<?> eventType) {
+        if (Property.ValueChangeEvent.class.isAssignableFrom(eventType)) {
+            if (valueChangeListeners == null) {
+                return Collections.EMPTY_LIST;
+            } else {
+                return Collections.unmodifiableCollection(valueChangeListeners);
+            }
+        } else if (Property.ReadOnlyStatusChangeEvent.class
+                .isAssignableFrom(eventType)) {
+            if (readOnlyStatusChangeListeners == null) {
+                return Collections.EMPTY_LIST;
+            } else {
+                return Collections
+                        .unmodifiableCollection(readOnlyStatusChangeListeners);
+            }
+        }
+
+        return Collections.EMPTY_LIST;
+    }
+
 }