com.b2international.snowowl.snomed.datastore.request.SnomedBulkRequest.java Source code

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Here is the source code for com.b2international.snowowl.snomed.datastore.request.SnomedBulkRequest.java

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/*
 * Copyright 2018 B2i Healthcare Pte Ltd, http://b2i.sg
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.b2international.snowowl.snomed.datastore.request;

import java.util.Collection;
import java.util.Map.Entry;
import java.util.Set;
import java.util.UUID;
import java.util.stream.Collectors;

import org.eclipse.emf.cdo.CDOObject;

import com.b2international.snowowl.core.domain.TransactionContext;
import com.b2international.snowowl.core.events.DelegatingRequest;
import com.b2international.snowowl.core.events.Request;
import com.b2international.snowowl.core.events.bulk.BulkRequest;
import com.b2international.snowowl.core.exceptions.ComponentNotFoundException;
import com.b2international.snowowl.datastore.request.DeleteRequest;
import com.b2international.snowowl.snomed.Concept;
import com.b2international.snowowl.snomed.Description;
import com.b2international.snowowl.snomed.Relationship;
import com.b2international.snowowl.snomed.common.SnomedTerminologyComponentConstants;
import com.b2international.snowowl.snomed.snomedrefset.SnomedRefSetMember;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Multimap;

/**
 * @since 6.5
 * @param <C>
 * @param <T>
 * @param <R>
 */
public final class SnomedBulkRequest<R> extends DelegatingRequest<TransactionContext, TransactionContext, R> {

    SnomedBulkRequest(Request<TransactionContext, R> next) {
        super(next);
    }

    @Override
    public R execute(TransactionContext context) {
        ImmutableList.Builder<SnomedComponentRequest<?>> requests = ImmutableList.builder();
        ImmutableList.Builder<DeleteRequest> deletions = ImmutableList.builder();
        collectNestedRequests(next(), requests, deletions);

        // Prefetch all component IDs mentioned in reference set member creation requests, abort if any of them can not be found
        final Set<String> requiredComponentIds = requests.build().stream()
                .flatMap(request -> request.getRequiredComponentIds(context).stream())
                .filter(componentId -> SnomedTerminologyComponentConstants
                        .getTerminologyComponentIdValueSafe(componentId) != -1L) // just in case filter out invalid component IDs
                .collect(Collectors.toSet());

        final Multimap<Class<? extends CDOObject>, String> componentIdsByType = HashMultimap
                .create(FluentIterable.from(requiredComponentIds).index(this::getCdoType));

        // collect all deleted IDs as well
        deletions.build().stream().map(DeleteRequest::getComponentId)
                .forEach(componentId -> componentIdsByType.put(getCdoType(componentId), componentId));

        try {
            for (final Entry<Class<? extends CDOObject>, Collection<String>> idsForType : componentIdsByType.asMap()
                    .entrySet()) {
                context.lookup(idsForType.getValue(), idsForType.getKey());
            }
        } catch (final ComponentNotFoundException e) {
            throw e.toBadRequestException();
        }

        // bind additional caches to the context
        TransactionContext newContext = context.inject().bind(Synonyms.class, new Synonyms(context)).build();

        return next(newContext);
    }

    private Class<? extends CDOObject> getCdoType(String componentId) {
        switch (SnomedTerminologyComponentConstants.getTerminologyComponentIdValueSafe(componentId)) {
        case SnomedTerminologyComponentConstants.CONCEPT_NUMBER:
            return Concept.class;
        case SnomedTerminologyComponentConstants.DESCRIPTION_NUMBER:
            return Description.class;
        case SnomedTerminologyComponentConstants.RELATIONSHIP_NUMBER:
            return Relationship.class;
        default: {
            try {
                UUID.fromString(componentId);
                return SnomedRefSetMember.class;
            } catch (IllegalArgumentException e) {
                throw new UnsupportedOperationException(
                        "Cannot determine CDO class from component ID '" + componentId + "'.");
            }
        }
        }
    }

    private static void collectNestedRequests(Request<?, ?> root,
            ImmutableList.Builder<SnomedComponentRequest<?>> requests,
            ImmutableList.Builder<DeleteRequest> deletions) {
        if (root instanceof DeleteRequest) {
            deletions.add((DeleteRequest) root);
        } else if (root instanceof SnomedComponentRequest<?>) {
            requests.add((SnomedComponentRequest<?>) root);
        } else if (root instanceof DelegatingRequest<?, ?, ?>) {
            collectNestedRequests(((DelegatingRequest<?, ?, ?>) root).next(), requests, deletions);
        } else if (root instanceof BulkRequest<?>) {
            ((BulkRequest<?>) root).getRequests().forEach(req -> {
                collectNestedRequests(req, requests, deletions);
            });
        }
    }

}