--- /dev/null
+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/eplv10.html
+ */
+package org.opendaylight.yangtools.yang.model.repo.util;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.HashMultimap;
+import com.google.common.collect.Multimap;
+import com.google.common.util.concurrent.AsyncFunction;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import org.opendaylight.yangtools.yang.model.repo.api.SchemaContextFactory;
+import org.opendaylight.yangtools.yang.model.repo.api.SchemaRepository;
+import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceFilter;
+import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceRepresentation;
+import org.opendaylight.yangtools.yang.model.repo.api.SourceIdentifier;
+import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceProvider;
+import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceRegistration;
+import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceRegistry;
+import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceTransformationException;
+import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceTransformer;
+import org.opendaylight.yangtools.yang.model.repo.spi.SchemaTransformerRegistration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class AbstractSchemaRepository implements SchemaRepository, SchemaSourceRegistry {
+ private static final Logger LOG = LoggerFactory.getLogger(AbstractSchemaRepository.class);
+ private static final Comparator<SchemaTransformerRegistration> TRANSFORMER_COST_COMPARATOR = new Comparator<SchemaTransformerRegistration>() {
+ @Override
+ public int compare(final SchemaTransformerRegistration o1, final SchemaTransformerRegistration o2) {
+ return o1.getInstance().getCost() - o2.getInstance().getCost();
+ }
+ };
+
+ /*
+ * Output-type -> transformer map. Our usage involves knowing the destination type,
+ * so we have to work backwards and find a transformer chain which will get us
+ * to that representation given our available sources.
+ */
+ private final Multimap<Class<? extends SchemaSourceRepresentation>, SchemaTransformerRegistration> transformers =
+ HashMultimap.create();
+
+ /*
+ * Source identifier -> representation -> provider map. We usually are looking for
+ * a specific representation a source.
+ */
+ private final Map<SourceIdentifier, Multimap<Class<?>, AbstractSchemaSourceRegistration>> sources = new HashMap<>();
+
+
+ private static final <T extends SchemaSourceRepresentation> ListenableFuture<Optional<T>> fetchSource(final SourceIdentifier id, final Iterator<AbstractSchemaSourceRegistration> it) {
+ if (!it.hasNext()) {
+ return Futures.immediateFuture(Optional.<T>absent());
+ }
+
+ return Futures.transform(((SchemaSourceProvider<T>)it.next().getProvider()).getSource(id), new AsyncFunction<Optional<T>, Optional<T>>() {
+ @Override
+ public ListenableFuture<Optional<T>> apply(final Optional<T> input) throws Exception {
+ if (input.isPresent()) {
+ return Futures.immediateFuture(input);
+ } else {
+ return fetchSource(id, it);
+ }
+ }
+ });
+ }
+
+ private <T extends SchemaSourceRepresentation> ListenableFuture<Optional<T>> transformSchemaSource(final SourceIdentifier id, final Class<T> representation) {
+ final Multimap<Class<?>, AbstractSchemaSourceRegistration> srcs = sources.get(id);
+ if (srcs.isEmpty()) {
+ return Futures.immediateFailedFuture(new SchemaSourceTransformationException(
+ String.format("No providers producing a representation of %s registered", id)));
+ }
+
+ final Collection<SchemaTransformerRegistration> ts = transformers.get(representation);
+ if (ts.isEmpty()) {
+ return Futures.immediateFailedFuture(new SchemaSourceTransformationException(
+ String.format("No transformers producing representation %s registered", representation)));
+ }
+
+ // Build up the candidate list
+ final List<SchemaTransformerRegistration> candidates = new ArrayList<>();
+ for (SchemaTransformerRegistration tr : ts) {
+ final SchemaSourceTransformer<?, ?> t = tr.getInstance();
+ final Class<?> i = t.getInputRepresentation();
+ if (srcs.containsKey(i)) {
+ candidates.add(tr);
+ } else {
+ LOG.debug("Provider for {} in {} not found, skipping transfomer {}", id, i, t);
+ }
+ }
+
+ if (candidates.isEmpty()) {
+ return Futures.immediateFailedFuture(new SchemaSourceTransformationException(
+ String.format("No matching source/transformer pair for source %s representation %s found", id, representation)));
+ }
+
+ Collections.sort(candidates, TRANSFORMER_COST_COMPARATOR);
+ // return transform(candidates.iterator(), id);
+ return null;
+ }
+
+ /**
+ * Obtain a SchemaSource is selected representation
+ */
+ protected <T extends SchemaSourceRepresentation> ListenableFuture<Optional<T>> getSchemaSource(final SourceIdentifier id, final Class<T> representation) {
+ final Multimap<Class<?>, AbstractSchemaSourceRegistration> srcs = sources.get(id);
+ if (srcs == null) {
+ LOG.debug("No providers registered for source {}", id);
+ return Futures.immediateFuture(Optional.<T>absent());
+ }
+
+ final Collection<AbstractSchemaSourceRegistration> candidates = srcs.get(representation);
+ return Futures.transform(AbstractSchemaRepository.<T>fetchSource(id, candidates.iterator()), new AsyncFunction<Optional<T>, Optional<T>>() {
+ @Override
+ public ListenableFuture<Optional<T>> apply(final Optional<T> input) throws Exception {
+ if (input.isPresent()) {
+ return Futures.immediateFuture(input);
+ }
+
+ return transformSchemaSource(id, representation);
+ }
+ });
+ }
+
+ @Override
+ public SchemaContextFactory createSchemaContextFactory(final SchemaSourceFilter filter) {
+ // TODO Auto-generated method stub
+ return null;
+ }
+
+ private void addSource(final SourceIdentifier id, final Class<?> rep, final AbstractSchemaSourceRegistration reg) {
+ Multimap<Class<?>, AbstractSchemaSourceRegistration> m = sources.get(id);
+ if (m == null) {
+ m = HashMultimap.create();
+ sources.put(id, m);
+ }
+
+ m.put(rep, reg);
+ }
+
+ private void removeSource(final SourceIdentifier id, final Class<?> rep, final SchemaSourceRegistration reg) {
+ final Multimap<Class<?>, AbstractSchemaSourceRegistration> m = sources.get(id);
+ if (m != null) {
+ m.remove(rep, reg);
+ if (m.isEmpty()) {
+ sources.remove(m);
+ }
+ }
+ }
+
+ @Override
+ public <T extends SchemaSourceRepresentation> SchemaSourceRegistration registerSchemaSource(
+ final SourceIdentifier identifier, final SchemaSourceProvider<? super T> provider, final Class<T> representation) {
+ final AbstractSchemaSourceRegistration ret = new AbstractSchemaSourceRegistration(identifier, provider) {
+ @Override
+ protected void removeRegistration() {
+ removeSource(identifier, representation, this);
+ }
+ };
+
+ addSource(identifier, representation, ret);
+ return ret;
+ }
+
+ @Override
+ public SchemaTransformerRegistration registerSchemaSourceTransformer(final SchemaSourceTransformer<?, ?> transformer) {
+ final SchemaTransformerRegistration ret = new AbstractSchemaTransformerRegistration(transformer) {
+ @Override
+ protected void removeRegistration() {
+ transformers.remove(transformer.getOutputRepresentation(), this);
+ }
+ };
+
+ transformers.put(transformer.getOutputRepresentation(), ret);
+ return ret;
+ }
+}
Code Review / yangtools.git / commitdiff