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

   1 /*
   2  * Copyright (c) 2023 PANTHEON.tech, s.r.o. 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.Nullable;
  14 import org.opendaylight.mdsal.binding.api.DataChangeListener;
  15 import org.opendaylight.mdsal.binding.dom.codec.api.BindingAugmentationCodecTreeNode;
  16 import org.opendaylight.mdsal.binding.dom.codec.api.BindingDataObjectCodecTreeNode;
  17 import org.opendaylight.mdsal.binding.dom.codec.api.CommonDataObjectCodecTreeNode;
  18 import org.opendaylight.mdsal.dom.api.ClusteredDOMDataTreeChangeListener;
  19 import org.opendaylight.yangtools.yang.binding.DataObject;
  20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  21 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidate;
  22
  23 final class BindingDOMDataChangeListenerAdapter<T extends DataObject> implements ClusteredDOMDataTreeChangeListener {
  24     private final AdapterContext adapterContext;
  25     private final DataChangeListener<T> listener;
  26
  27     BindingDOMDataChangeListenerAdapter(final AdapterContext adapterContext, final DataChangeListener<T> listener) {
  28         this.adapterContext = requireNonNull(adapterContext);
  29         this.listener = requireNonNull(listener);
  30     }
  31
  32     @Override
  33     public void onDataTreeChanged(final List<DataTreeCandidate> changes) {
  34         final var first = changes.get(0);
  35         final var serializer = adapterContext.currentSerializer();
  36         final var codec = serializer.getSubtreeCodec(serializer.coerceInstanceIdentifier(first.getRootPath()));
  37
  38         listener.dataChanged(deserialize(codec, first.getRootNode().dataBefore()),
  39             deserialize(codec, changes.get(changes.size() - 1).getRootNode().dataAfter()));
  40     }
  41
  42     @Override
  43     public void onInitialData() {
  44         listener.dataChanged(null, null);
  45     }
  46
  47     @SuppressWarnings("unchecked")
  48     private @Nullable T deserialize(final CommonDataObjectCodecTreeNode<?> codec, final NormalizedNode data) {
  49         if (data == null) {
  50             return null;
  51         } else if (codec instanceof BindingDataObjectCodecTreeNode<?> dataObject) {
  52             return (T) dataObject.deserialize(data);
  53         } else if (codec instanceof BindingAugmentationCodecTreeNode<?> augmentation) {
  54             return (T) augmentation.filterFrom(data);
  55         } else {
  56             throw new IllegalStateException("Unhandled codec " + codec);
  57         }
  58     }
  59 }