binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/BindingDOMDataTreeChangeListenerAdapter.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.mdsal.binding.dom.adapter;
   9
  10 import static java.util.Objects.requireNonNull;
  11
  12 import java.util.List;
  13 import org.eclipse.jdt.annotation.NonNullByDefault;
  14 import org.eclipse.jdt.annotation.Nullable;
  15 import org.opendaylight.mdsal.binding.api.DataTreeChangeListener;
  16 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  17 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  18 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
  19 import org.opendaylight.yangtools.yang.binding.Augmentation;
  20 import org.opendaylight.yangtools.yang.binding.DataObject;
  21 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidate;
  22
  23 /**
  24  * Adapter wrapping Binding {@link DataTreeChangeListener} and exposing it as {@link DOMDataTreeChangeListener}
  25  * and translated DOM events to their Binding equivalent.
  26  */
  27 @NonNullByDefault
  28 final class BindingDOMDataTreeChangeListenerAdapter<T extends DataObject> implements DOMDataTreeChangeListener {
  29     private final AdapterContext adapterContext;
  30     private final DataTreeChangeListener<T> listener;
  31     private final LogicalDatastoreType store;
  32     private final @Nullable Class<? extends Augmentation<?>> augment;
  33
  34     private boolean initialSyncDone;
  35
  36     BindingDOMDataTreeChangeListenerAdapter(final AdapterContext adapterContext, final DataTreeIdentifier<T> treeId,
  37             final DataTreeChangeListener<T> listener) {
  38         this.adapterContext = requireNonNull(adapterContext);
  39         this.listener = requireNonNull(listener);
  40         store = treeId.datastore();
  41         augment = extractAugment(treeId.path().getTargetType());
  42     }
  43
  44     @SuppressWarnings("unchecked")
  45     private static @Nullable Class<? extends Augmentation<?>> extractAugment(final Class<?> target) {
  46         return Augmentation.class.isAssignableFrom(target)
  47             ? (Class<? extends Augmentation<?>>) target.asSubclass(Augmentation.class) : null;
  48     }
  49
  50     @Override
  51     public void onDataTreeChanged(final List<DataTreeCandidate> domChanges) {
  52         final var changes = LazyDataTreeModification.<T>from(adapterContext.currentSerializer(), domChanges, store,
  53             augment);
  54         if (!changes.isEmpty()) {
  55             listener.onDataTreeChanged(changes);
  56         } else if (!initialSyncDone) {
  57             onInitialData();
  58         }
  59     }
  60
  61     @Override
  62     public void onInitialData() {
  63         initialSyncDone = true;
  64         listener.onInitialData();
  65     }
  66 }