Move inner interfaces to upper level to reduce IntentManager's size
Change-Id: Ice4fba9e0e70f72904fe7dfa9f371f61ca739b48
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/IntentUpdate.java b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentUpdate.java
new file mode 100644
index 0000000..155c0fe
--- /dev/null
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/IntentUpdate.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.onosproject.net.intent.impl;
+
+import org.onosproject.net.intent.BatchWrite;
+
+import java.util.Optional;
+
+/**
+ * Represents a phase of processing an intent.
+ */
+interface IntentUpdate {
+
+ /**
+ * Execute the procedure represented by the instance
+ * and generates the next update instance.
+ *
+ * @return next update
+ */
+ default Optional<IntentUpdate> execute() {
+ return Optional.empty();
+ }
+
+ /**
+ * Write data to the specified BatchWrite before execution() is called.
+ *
+ * @param batchWrite batchWrite
+ */
+ default void writeBeforeExecution(BatchWrite batchWrite) {}
+}