forked from D-Net/dnet-hadoop
89 lines
2.8 KiB
Java
89 lines
2.8 KiB
Java
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package eu.dnetlib.dhp.actionmanager.promote;
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import static eu.dnetlib.dhp.schema.common.ModelSupport.isSubClass;
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import java.util.function.BiFunction;
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import eu.dnetlib.dhp.common.FunctionalInterfaceSupport.SerializableSupplier;
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import eu.dnetlib.dhp.schema.oaf.Oaf;
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import eu.dnetlib.dhp.schema.oaf.OafEntity;
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import eu.dnetlib.dhp.schema.oaf.Relation;
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/** OAF model merging support. */
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public class MergeAndGet {
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private MergeAndGet() {
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}
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/**
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* Strategy for merging OAF model objects.
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* <p>
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* MERGE_FROM_AND_GET: use OAF 'mergeFrom' method SELECT_NEWER_AND_GET: use last update timestamp to return newer
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* instance
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*/
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public enum Strategy {
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MERGE_FROM_AND_GET, SELECT_NEWER_AND_GET
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}
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/**
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* Returns a function for merging OAF model objects.
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*
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* @param strategy Strategy to be used to merge objects
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* @param <G> Graph table type
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* @param <A> Action payload type
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* @return BiFunction to be used to merge OAF objects
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*/
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public static <G extends Oaf, A extends Oaf> SerializableSupplier<BiFunction<G, A, G>> functionFor(
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Strategy strategy) {
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switch (strategy) {
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case MERGE_FROM_AND_GET:
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return () -> MergeAndGet::mergeFromAndGet;
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case SELECT_NEWER_AND_GET:
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return () -> MergeAndGet::selectNewerAndGet;
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}
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throw new RuntimeException();
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}
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private static <G extends Oaf, A extends Oaf> G mergeFromAndGet(G x, A y) {
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if (isSubClass(x, Relation.class) && isSubClass(y, Relation.class)) {
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((Relation) x).mergeFrom((Relation) y);
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return x;
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} else if (isSubClass(x, OafEntity.class)
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&& isSubClass(y, OafEntity.class)
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&& isSubClass(x, y)) {
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((OafEntity) x).mergeFrom((OafEntity) y);
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return x;
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}
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throw new RuntimeException(
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String
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.format(
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"MERGE_FROM_AND_GET incompatible types: %s, %s",
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x.getClass().getCanonicalName(), y.getClass().getCanonicalName()));
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}
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@SuppressWarnings("unchecked")
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private static <G extends Oaf, A extends Oaf> G selectNewerAndGet(G x, A y) {
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if (x.getClass().equals(y.getClass())
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&& x.getLastupdatetimestamp() > y.getLastupdatetimestamp()) {
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return x;
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} else if (x.getClass().equals(y.getClass())
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&& x.getLastupdatetimestamp() < y.getLastupdatetimestamp()) {
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return (G) y;
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} else if (isSubClass(x, y) && x.getLastupdatetimestamp() > y.getLastupdatetimestamp()) {
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return x;
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} else if (isSubClass(x, y) && x.getLastupdatetimestamp() < y.getLastupdatetimestamp()) {
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throw new RuntimeException(
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String
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.format(
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"SELECT_NEWER_AND_GET cannot return right type when it is not the same as left type: %s, %s",
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x.getClass().getCanonicalName(), y.getClass().getCanonicalName()));
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}
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throw new RuntimeException(
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String
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.format(
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"SELECT_NEWER_AND_GET cannot be used when left is not subtype of right: %s, %s",
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x.getClass().getCanonicalName(), y.getClass().getCanonicalName()));
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}
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}
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