com.b2international.snowowl.snomed.datastore.index.update.ReferenceSetMembershipUpdater.java Source code

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Here is the source code for com.b2international.snowowl.snomed.datastore.index.update.ReferenceSetMembershipUpdater.java

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/*
 * Copyright 2011-2018 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.index.update;

import java.util.Collection;

import com.b2international.snowowl.snomed.datastore.index.entry.SnomedComponentDocument;
import com.b2international.snowowl.snomed.datastore.index.refset.RefSetMemberChange;
import com.b2international.snowowl.snomed.datastore.index.refset.RefSetMemberChange.MemberChangeKind;
import com.google.common.collect.HashMultiset;
import com.google.common.collect.Multiset;

/**
 * @since 4.3
 */
public class ReferenceSetMembershipUpdater {

    private final Collection<RefSetMemberChange> memberChanges;
    private final Collection<String> currentMemberOf;
    private final Collection<String> currentActiveMemberOf;

    public ReferenceSetMembershipUpdater(final Collection<RefSetMemberChange> memberChanges,
            final Collection<String> currentMemberOf, final Collection<String> currentActiveMemberOf) {
        this.memberChanges = memberChanges;
        this.currentMemberOf = currentMemberOf;
        this.currentActiveMemberOf = currentActiveMemberOf;
    }

    public <B extends SnomedComponentDocument.SnomedComponentDocumentBuilder<B>> void update(B doc) {
        // get reference set membership fields
        final Multiset<String> newMemberOf = HashMultiset.create(currentMemberOf);
        final Multiset<String> newActiveMemberOf = HashMultiset.create(currentActiveMemberOf);
        processReferencingRefSetIds(newMemberOf, newActiveMemberOf);
        // re-add reference set membership fields
        doc.memberOf(newMemberOf);
        doc.activeMemberOf(newActiveMemberOf);
    }

    private void processReferencingRefSetIds(final Multiset<String> memberOf,
            final Multiset<String> activeMemberOf) {
        memberChanges.stream().filter(c -> c.getChangeKind() == MemberChangeKind.ADDED).forEach(change -> {
            if (change.isActive()) {
                activeMemberOf.add(change.getRefSetId());
            }
            memberOf.add(change.getRefSetId());
        });

        memberChanges.stream().filter(c -> c.getChangeKind() == MemberChangeKind.CHANGED).forEach(change -> {
            // if the new state is active, then add it to the activeMemberOf otherwise remove it from that
            // this state transition won't change the memberOf field were all referring refsets are tracked
            if (change.isActive()) {
                activeMemberOf.add(change.getRefSetId());
            } else {
                activeMemberOf.remove(change.getRefSetId());
            }
        });

        memberChanges.stream().filter(c -> c.getChangeKind() == MemberChangeKind.REMOVED).forEach(change -> {
            if (change.isActive()) {
                activeMemberOf.remove(change.getRefSetId());
            }
            memberOf.remove(change.getRefSetId());
        });
    }

}