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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.samples.interfaces.mapping.oper;
+
+import com.google.inject.Inject;
+import io.fd.honeycomb.samples.interfaces.mapping.LowerLayerAccess;
+import io.fd.honeycomb.translate.impl.read.GenericListReader;
+import io.fd.honeycomb.translate.impl.read.GenericReader;
+import io.fd.honeycomb.translate.read.ReaderFactory;
+import io.fd.honeycomb.translate.read.registry.ModifiableReaderRegistryBuilder;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.InterfacesState;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.InterfacesStateBuilder;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810._interface.state.Counters;
+import org.opendaylight.yang.gen.v1.io.fd.honeycomb.samples.interfaces.rev160810.interfaces.state.Interface;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+public class InterfacesReaderFactory implements ReaderFactory {
+
+ @Nonnull
+ private final LowerLayerAccess access;
+
+ @Inject
+ public InterfacesReaderFactory(@Nonnull final LowerLayerAccess access) {
+ this.access = access;
+ }
+
+ @Override
+ public void init(@Nonnull final ModifiableReaderRegistryBuilder registry) {
+ // ReaderFactory is intended for registering Readers into HC framework
+ // Readers provide ONLY operational (config "false") data straight from underlying device/layer
+ // they are triggered when RESTCONF GET on operational is invoked or when NETCONF get operation is executed
+
+ // Our model root for operational data is InterfacesState
+ final InstanceIdentifier<InterfacesState> root = InstanceIdentifier.create(InterfacesState.class);
+ // Since InterfacesState has no direct data children (leaves) only a structural reader is registered
+ // This reader just fills in the composite hierarchy of readers
+ // Honeycomb can't automatically instantiate structural readers and plugins have to help it by invoking as:
+ registry.addStructuralReader(root, InterfacesStateBuilder.class);
+
+ // Next child node is Interface (list)
+ final InstanceIdentifier<Interface> ifcListId = root.child(Interface.class);
+ registry.add(new GenericListReader<>(ifcListId, new InterfaceReaderCustomizer(access)));
+
+ // Next child is a container Counters
+ final InstanceIdentifier<Counters> countersId = ifcListId.child(Counters.class);
+ // By adding the reader with addAfter, we can ensure ordering of execution among the readers
+ // Useful in cases when a certain read has to be invoked before/after another
+ // In this case, we are ensuring that Counters are read after Interface is read
+ // "add" could be used instead, leaving the ordering to "nature"
+ // Same applies for writers
+ registry.addAfter(new GenericReader<>(countersId, new CountersReaderCustomizer(access)), ifcListId);
+ }
+}