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+/*
+ * 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.tutorial.init;
+
+import io.fd.honeycomb.data.init.AbstractDataTreeConverter;
+import com.google.inject.Inject;
+import com.google.inject.name.Named;
+import javax.annotation.Nonnull;
+import org.opendaylight.controller.md.sal.binding.api.DataBroker;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.sample.plugin.rev160918.SamplePlugin;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.sample.plugin.rev160918.SamplePluginBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.sample.plugin.rev160918.SamplePluginState;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Initialize configuration data based on operational data.
+ * <p/>
+ * Very useful when a plugin is initiated but the underlying layer already contains some operation state.
+ * Deriving the configuration from existing operational state enables reconciliation in case when Honeycomb's persistence
+ * is not available to do the work for us.
+ */
+public final class ConfigDataInitializer extends AbstractDataTreeConverter<SamplePluginState, SamplePlugin> {
+
+    @Inject
+    public ConfigDataInitializer(@Named("honeycomb-initializer") @Nonnull final DataBroker bindingDataBroker) {
+        super(bindingDataBroker, InstanceIdentifier.create(SamplePluginState.class), InstanceIdentifier.create(SamplePlugin.class));
+    }
+
+    @Override
+    public SamplePlugin convert(final SamplePluginState operationalData) {
+        // Transfer all the operational data into configuration
+        return new SamplePluginBuilder()
+                .setPgStreams(operationalData.getPgStreams())
+                .build();
+    }
+}