1 files changed, 60 insertions, 0 deletions
diff --git a/v3po/vpp-facade-api/src/main/java/io/fd/honeycomb/v3po/vpp/facade/write/WriteContext.java b/v3po/vpp-facade-api/src/main/java/io/fd/honeycomb/v3po/vpp/facade/write/WriteContext.java
new file mode 100644
index 000000000..ffc9f20f7
--- /dev/null
+++ b/v3po/vpp-facade-api/src/main/java/io/fd/honeycomb/v3po/vpp/facade/write/WriteContext.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ *
+ * 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 io.fd.honeycomb.v3po.vpp.facade.write;
+
+import com.google.common.annotations.Beta;
+import com.google.common.base.Optional;
+import io.fd.honeycomb.v3po.vpp.facade.Context;
+import javax.annotation.Nonnull;
+import org.opendaylight.yangtools.yang.binding.DataObject;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Context providing information about current state of DataTree to writers
+ */
+@Beta
+public interface WriteContext extends AutoCloseable {
+
+    /**
+     * Read any data object before current modification was applied
+     *
+     * @param currentId Id of an object to read
+     *
+     * @return Data before the modification was applied
+     */
+    Optional<DataObject> readBefore(@Nonnull final InstanceIdentifier<? extends DataObject> currentId);
+
+    /**
+     * Read any data object from current modification
+     *
+     * @param currentId Id of an object to read
+     *
+     * @return Data from the modification
+     */
+    Optional<DataObject> readAfter(@Nonnull final InstanceIdentifier<? extends DataObject> currentId);
+
+    /**
+     * Get key value storage for customizers
+     *
+     * @return Context for customizers
+     */
+    @Nonnull
+    Context getContext();
+
+    @Override
+    void close();
+}