2 * Copyright (c) 2014 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.yangtools.yang.model.repo.spi;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.util.concurrent.AsyncFunction;
13 import com.google.common.util.concurrent.Futures;
14 import com.google.common.util.concurrent.ListenableFuture;
15 import com.google.common.util.concurrent.MoreExecutors;
16 import java.util.HashMap;
18 import org.opendaylight.yangtools.yang.model.api.source.SourceIdentifier;
19 import org.opendaylight.yangtools.yang.model.api.source.SourceRepresentation;
20 import org.opendaylight.yangtools.yang.model.repo.api.SchemaRepository;
22 public class SchemaSourceTransformer<S extends SourceRepresentation, D extends SourceRepresentation>
23 implements SchemaSourceListener, SchemaSourceProvider<D> {
25 public interface Transformation<S extends SourceRepresentation, D extends SourceRepresentation>
26 extends AsyncFunction<S, D> {
28 ListenableFuture<D> apply(S input) throws Exception;
31 private final Map<PotentialSchemaSource<?>, RefcountedRegistration> availableSources = new HashMap<>();
32 private final SchemaSourceRegistry consumer;
33 private final SchemaRepository provider;
34 private final AsyncFunction<S, D> function;
35 private final Class<S> srcClass;
36 private final Class<D> dstClass;
38 public SchemaSourceTransformer(final SchemaRepository provider, final Class<S> srcClass,
39 final SchemaSourceRegistry consumer, final Class<D> dstClass, final AsyncFunction<S, D> function) {
40 this.provider = requireNonNull(provider);
41 this.consumer = requireNonNull(consumer);
42 this.function = requireNonNull(function);
43 this.srcClass = requireNonNull(srcClass);
44 this.dstClass = requireNonNull(dstClass);
48 public final ListenableFuture<D> getSource(final SourceIdentifier sourceIdentifier) {
49 return Futures.transformAsync(provider.getSchemaSource(sourceIdentifier, srcClass), function,
50 MoreExecutors.directExecutor());
54 public final void schemaSourceEncountered(final SourceRepresentation source) {
59 public final void schemaSourceRegistered(final Iterable<PotentialSchemaSource<?>> sources) {
60 for (var src : sources) {
61 final var rep = src.getRepresentation();
62 if (srcClass.isAssignableFrom(rep) && dstClass != rep) {
69 public final void schemaSourceUnregistered(final PotentialSchemaSource<?> source) {
70 final var rep = source.getRepresentation();
71 if (srcClass.isAssignableFrom(rep) && dstClass != rep) {
72 unregisterSource(source);
76 private void registerSource(final PotentialSchemaSource<?> src) {
77 final var reg = availableSources.get(src);
83 final var newSrc = PotentialSchemaSource.create(src.getSourceIdentifier(), dstClass,
84 src.getCost() + PotentialSchemaSource.Costs.COMPUTATION.getValue());
85 availableSources.put(src, new RefcountedRegistration(consumer.registerSchemaSource(this, newSrc)));
88 private void unregisterSource(final PotentialSchemaSource<?> src) {
89 final RefcountedRegistration reg = availableSources.get(src);
90 if (reg != null && reg.decRef()) {
91 availableSources.remove(src);