HTTPCLIENT-1772: [OSGi] WeakList needs to support "clear" method

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/branches/4.5.x@1762913 13f79535-47bb-0310-9956-ffa450edef68

httpclient-osgi/src/main/java/org/apache/http/osgi/impl/WeakList.java

@@ -62,6 +62,11 @@ class WeakList<T> extends AbstractList<T> {
         return innerList.add(new WeakReference<T>(t));
     }
 
+    @Override
+    public void clear() {
+        innerList.clear();
+    }
+
     private void checkReferences() {
         final ListIterator<WeakReference<T>> references = innerList.listIterator();
         while (references.hasNext()) {

httpclient-osgi/src/test/java/org/apache/http/osgi/impl/WeakListTest.java

@@ -59,4 +59,15 @@ public class WeakListTest {
         assertTrue(thrown);
     }
 
+    @Test
+    public void clearSupported() {
+        final WeakList<Object> list = new WeakList<Object>();
+
+        list.add("hello");
+        assertEquals(1, list.size());
+
+        list.clear();
+        assertEquals(0, list.size());
+    }
+
 }