pubsub: Add EventItemsExtensionFilter

smack-extensions/src/main/java/org/jivesoftware/smackx/pubsub/filter/EventItemsExtensionFilter.java

@@ -0,0 +1,37 @@
+/**
+ *
+ * Copyright 2020 Florian Schmaus
+ *
+ * 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 org.jivesoftware.smackx.pubsub.filter;
+
+import org.jivesoftware.smack.filter.ExtensionElementFilter;
+
+import org.jivesoftware.smackx.pubsub.EventElement;
+import org.jivesoftware.smackx.pubsub.EventElementType;
+
+public final class EventItemsExtensionFilter extends ExtensionElementFilter<EventElement> {
+
+    public static final EventItemsExtensionFilter INSTANCE = new EventItemsExtensionFilter();
+
+    private EventItemsExtensionFilter() {
+        super(EventElement.class);
+    }
+
+    @Override
+    public boolean accept(EventElement eventElement) {
+        EventElementType eventElementType = eventElement.getEventType();
+        return eventElementType == EventElementType.items;
+    }
+}