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.opendaylight.mdsal.binding.api.DataTreeChangeListener;
  14 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  15 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
  16 import org.opendaylight.yangtools.yang.binding.DataObject;
  17 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidate;
  18
  19 /**
  20  * Adapter wrapping Binding {@link DataTreeChangeListener} and exposing it as {@link DOMDataTreeChangeListener}
  21  * and translated DOM events to their Binding equivalent.
  22  */
  23 class BindingDOMDataTreeChangeListenerAdapter<T extends DataObject> implements DOMDataTreeChangeListener {
  24     private final AdapterContext adapterContext;
  25     private final DataTreeChangeListener<T> listener;
  26     private final LogicalDatastoreType store;
  27     private final Class<T> augment;
  28
  29     private boolean initialSyncDone;
  30
  31     BindingDOMDataTreeChangeListenerAdapter(final AdapterContext adapterContext,
  32             final DataTreeChangeListener<T> listener, final LogicalDatastoreType store, final Class<T> augment) {
  33         this.adapterContext = requireNonNull(adapterContext);
  34         this.listener = requireNonNull(listener);
  35         this.store = requireNonNull(store);
  36         this.augment = augment;
  37     }
  38
  39     @Override
  40     public void onDataTreeChanged(final List<DataTreeCandidate> domChanges) {
  41         final var changes = LazyDataTreeModification.<T>from(adapterContext.currentSerializer(), domChanges, store,
  42             augment);
  43         if (!changes.isEmpty()) {
  44             listener.onDataTreeChanged(changes);
  45         } else if (!initialSyncDone) {
  46             onInitialData();
  47         }
  48     }
  49
  50     @Override
  51     public void onInitialData() {
  52         initialSyncDone = true;
  53         listener.onInitialData();
  54     }
  55 }