/* * 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/epl-v10.html */ package org.opendaylight.yangtools.yang.model.repo.util; import com.google.common.base.Preconditions; import com.google.common.util.concurrent.AsyncFunction; import com.google.common.util.concurrent.CheckedFuture; import com.google.common.util.concurrent.Futures; import java.util.HashMap; import java.util.Map; import javax.annotation.Nonnull; import org.opendaylight.yangtools.util.concurrent.ExceptionMapper; import org.opendaylight.yangtools.util.concurrent.ReflectiveExceptionMapper; import org.opendaylight.yangtools.yang.model.repo.api.SchemaRepository; import org.opendaylight.yangtools.yang.model.repo.api.SchemaSourceException; 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.PotentialSchemaSource; import org.opendaylight.yangtools.yang.model.repo.spi.SchemaSourceListener; 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; public class SchemaSourceTransformer<S extends SchemaSourceRepresentation, D extends SchemaSourceRepresentation> implements SchemaSourceListener, SchemaSourceProvider<D> { private static final ExceptionMapper<SchemaSourceException> MAPPER = ReflectiveExceptionMapper.create("Source transformation", SchemaSourceException.class); @FunctionalInterface public interface Transformation<S extends SchemaSourceRepresentation, D extends SchemaSourceRepresentation> extends AsyncFunction<S, D> { @Override CheckedFuture<D, SchemaSourceException> apply(@Nonnull final S input) throws Exception; } private final Map<PotentialSchemaSource<?>, RefcountedRegistration> sources = new HashMap<>(); private final SchemaSourceRegistry consumer; private final SchemaRepository provider; private final AsyncFunction<S, D> function; private final Class<S> srcClass; private final Class<D> dstClass; public SchemaSourceTransformer(final SchemaRepository provider, final Class<S> srcClass, final SchemaSourceRegistry consumer, final Class<D> dstClass, final AsyncFunction<S, D> function) { this.provider = Preconditions.checkNotNull(provider); this.consumer = Preconditions.checkNotNull(consumer); this.function = Preconditions.checkNotNull(function); this.srcClass = Preconditions.checkNotNull(srcClass); this.dstClass = Preconditions.checkNotNull(dstClass); } @Override public CheckedFuture<D, SchemaSourceException> getSource(final SourceIdentifier sourceIdentifier) { final CheckedFuture<S, SchemaSourceException> f = provider.getSchemaSource(sourceIdentifier, srcClass); return Futures.makeChecked(Futures.transform(f, function), MAPPER); } @Override public final void schemaSourceEncountered(final SchemaSourceRepresentation source) { // Not interesting } @Override public final void schemaSourceRegistered(final Iterable<PotentialSchemaSource<?>> sources) { for (PotentialSchemaSource<?> src : sources) { final Class<?> rep = src.getRepresentation(); if (srcClass.isAssignableFrom(rep) && dstClass != rep) { registerSource(src); } } } @Override public final void schemaSourceUnregistered(final PotentialSchemaSource<?> source) { final Class<?> rep = source.getRepresentation(); if (srcClass.isAssignableFrom(rep) && dstClass != rep) { unregisterSource(source); } } private void registerSource(final PotentialSchemaSource<?> src) { RefcountedRegistration reg = sources.get(src); if (reg != null) { reg.incRef(); return; } final PotentialSchemaSource<D> newSrc = PotentialSchemaSource.create(src.getSourceIdentifier(), dstClass, src.getCost() + PotentialSchemaSource.Costs.COMPUTATION.getValue()); final SchemaSourceRegistration<D> r = consumer.registerSchemaSource(this, newSrc); sources.put(src, new RefcountedRegistration(r)); } private void unregisterSource(final PotentialSchemaSource<?> src) { final RefcountedRegistration reg = sources.get(src); if (reg != null && reg.decRef()) { sources.remove(src); } } }