2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
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
8 package org.opendaylight.mdsal.binding.dom.adapter;
10 import com.google.common.cache.CacheLoader;
11 import java.util.Optional;
12 import org.eclipse.jdt.annotation.NonNull;
13 import org.eclipse.jdt.annotation.Nullable;
15 public abstract class AdapterLoader<T, D> extends CacheLoader<Class<? extends T>, Optional<T>> {
18 public Optional<T> load(final Class<? extends T> key) {
19 final var builder = createBuilder(key);
20 for (var reqDeleg : builder.getRequiredDelegates()) {
21 final var deleg = getDelegate(reqDeleg);
23 builder.addDelegate(reqDeleg, deleg);
25 return Optional.empty();
28 return Optional.of(builder.build());
31 protected abstract @Nullable D getDelegate(Class<? extends D> reqDeleg);
33 protected abstract @NonNull AdapterBuilder<? extends T, D> createBuilder(Class<? extends T> key);