binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/BindingDOMDataListenerAdapter.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.NonNull;
  14 import org.opendaylight.mdsal.binding.api.DataListener;
  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.dom.api.DOMDataTreeChangeListener;
  18 import org.opendaylight.yangtools.yang.binding.DataObject;
  19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  21 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidate;
  22
  23 final class BindingDOMDataListenerAdapter<T extends DataObject> implements DOMDataTreeChangeListener {
  24     private final AdapterContext adapterContext;
  25     private final DataListener<T> listener;
  26
  27     BindingDOMDataListenerAdapter(final AdapterContext adapterContext, final DataListener<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 last = changes.get(changes.size() - 1);
  35         final var after = last.getRootNode().dataAfter();
  36         listener.dataChangedTo(after == null ? null : deserialize(last.getRootPath(), after));
  37     }
  38
  39     @Override
  40     public void onInitialData() {
  41         listener.dataChangedTo(null);
  42     }
  43
  44     @SuppressWarnings("unchecked")
  45     private T deserialize(final YangInstanceIdentifier path, final @NonNull NormalizedNode data) {
  46         final var serializer = adapterContext.currentSerializer();
  47         final var codec = serializer.getSubtreeCodec(serializer.coerceInstanceIdentifier(path));
  48         if (codec instanceof BindingDataObjectCodecTreeNode<?> dataObject) {
  49             return (T) dataObject.deserialize(data);
  50         } else if (codec instanceof BindingAugmentationCodecTreeNode<?> augmentation) {
  51             return (T) augmentation.filterFrom(data);
  52         } else {
  53             throw new IllegalStateException("Unhandled codec " + codec);
  54         }
  55     }
  56 }