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EnforcedThingMapper.java
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EnforcedThingMapper.java
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/*
* Copyright (c) 2019 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.thingsearch.service.persistence.write.mapping;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_FEATURES;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_FEATURE_ID;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_F_ARRAY;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_GLOBAL_READ;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_NAMESPACE;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_POLICY;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_POLICY_ID;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_POLICY_REVISION;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_REVISION;
import static org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants.FIELD_THING;
import java.util.List;
import java.util.Optional;
import javax.annotation.Nullable;
import org.bson.BsonArray;
import org.bson.BsonDocument;
import org.bson.BsonInt64;
import org.bson.BsonString;
import org.eclipse.ditto.internal.utils.persistence.mongo.DittoBsonJson;
import org.eclipse.ditto.json.JsonField;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.json.JsonValue;
import org.eclipse.ditto.policies.model.Policy;
import org.eclipse.ditto.policies.model.PolicyId;
import org.eclipse.ditto.policies.model.ResourceKey;
import org.eclipse.ditto.things.model.Thing;
import org.eclipse.ditto.things.model.ThingId;
import org.eclipse.ditto.things.model.signals.commands.ThingCommand;
import org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants;
import org.eclipse.ditto.thingsearch.service.persistence.write.model.Metadata;
import org.eclipse.ditto.thingsearch.service.persistence.write.model.ThingWriteModel;
/**
* Map Thing with Enforcer to Document.
*/
public final class EnforcedThingMapper {
private static final ResourceKey THING_ROOT_RESOURCE_KEY = ResourceKey.newInstance(ThingCommand.RESOURCE_TYPE, "/");
private EnforcedThingMapper() {
throw new AssertionError();
}
/**
* Map a Thing JSON into a search index entry with synthesized metadata.
*
* @param thing the Thing in JSON format.
* @param policy the policy of the Thing.
* @param policyRevision revision of the policy.
* @return BSON document to write into the search index.
* @throws org.eclipse.ditto.json.JsonMissingFieldException if Thing ID or revision is missing.
*/
public static BsonDocument mapThing(final JsonObject thing, final Policy policy, final long policyRevision) {
return toWriteModel(thing, policy, policyRevision).getThingDocument();
}
/**
* Map a Thing JSON into a search index write model.
*
* @param thing the Thing in JSON format.
* @param policy the policy of the Thing.
* @param policyRevision revision of the policy.
* @return BSON document to write into the search index.
* @throws org.eclipse.ditto.json.JsonMissingFieldException if Thing ID or revision is missing.
*/
private static ThingWriteModel toWriteModel(final JsonObject thing,
final Policy policy,
final long policyRevision) {
return toWriteModel(thing, policy, policyRevision, -1, null);
}
/**
* Map a Thing JSON into a search index write model.
*
* @param thing the Thing in JSON format.
* @param policy the policy-enforcer of the Thing.
* @param policyRevision revision of the policy for an policy enforcer.
* @param maxArraySize only arrays smaller than this are indexed.
* @param oldMetadata the metadata that triggered the search update, possibly containing sender information.
* @return BSON document to write into the search index.
* @throws org.eclipse.ditto.json.JsonMissingFieldException if Thing ID or revision is missing.
*/
public static ThingWriteModel toWriteModel(final JsonObject thing,
final Policy policy,
final long policyRevision,
final int maxArraySize,
@Nullable final Metadata oldMetadata) {
final String extractedThing = thing.getValueOrThrow(Thing.JsonFields.ID);
final var thingId = ThingId.of(extractedThing);
final long thingRevision = thing.getValueOrThrow(Thing.JsonFields.REVISION);
final var nullablePolicyId = thing.getValue(Thing.JsonFields.POLICY_ID).map(PolicyId::of).orElse(null);
final var metadata = Metadata.of(thingId, thingRevision, nullablePolicyId, policyRevision,
Optional.ofNullable(oldMetadata).flatMap(Metadata::getModified).orElse(null),
Optional.ofNullable(oldMetadata).map(Metadata::getEvents).orElse(List.of()),
Optional.ofNullable(oldMetadata).map(Metadata::getTimers).orElse(List.of()),
Optional.ofNullable(oldMetadata).map(Metadata::getSenders).orElse(List.of()))
.withOrigin(Optional.ofNullable(oldMetadata).flatMap(Metadata::getOrigin).orElse(null));
return ThingWriteModel.of(metadata, toBsonDocument(thing, policy, metadata));
}
static BsonDocument toBsonDocument(final JsonObject thing,
final Policy policy,
final Metadata metadata) {
final var thingId = metadata.getThingId();
final var thingRevision = metadata.getThingRevision();
final var policyRevision = metadata.getPolicyRevision().orElse(0L);
final var thingBson = DittoBsonJson.getInstance().parse(thing);
final var evaluatedPolicy = EvaluatedPolicy.of(policy, thing);
final var featureArray = getFeatureArray(thing, evaluatedPolicy);
return new BsonDocument().append(PersistenceConstants.FIELD_ID, new BsonString(thingId.toString()))
.append(FIELD_NAMESPACE, new BsonString(thingId.getNamespace()))
.append(FIELD_GLOBAL_READ, evaluatedPolicy.getGlobalRead())
.append(FIELD_REVISION, new BsonInt64(thingRevision))
.append(FIELD_POLICY_ID, new BsonString(metadata.getPolicyIdInPersistence()))
.append(FIELD_POLICY_REVISION, new BsonInt64(policyRevision))
.append(FIELD_THING, thingBson)
.append(FIELD_POLICY, evaluatedPolicy.forThing())
.append(FIELD_F_ARRAY, featureArray);
}
private static BsonArray getFeatureArray(final JsonObject thing, final EvaluatedPolicy evaluatedPolicy) {
final JsonObject features = thing.getValue(FIELD_FEATURES)
.filter(JsonValue::isObject)
.map(JsonValue::asObject)
.orElse(JsonObject.empty());
final var array = new BsonArray();
for (final var field : features) {
array.add(getFeatureArrayElement(field, evaluatedPolicy));
}
return array;
}
private static BsonDocument getFeatureArrayElement(final JsonField featureField,
final EvaluatedPolicy evaluatedPolicy) {
final BsonDocument doc = new BsonDocument();
final var featureId = featureField.getKeyName();
doc.put(FIELD_FEATURE_ID, new BsonString(featureId));
final JsonObject featureContent = Optional.of(featureField.getValue())
.filter(JsonValue::isObject)
.map(JsonValue::asObject)
.orElse(JsonObject.empty());
for (final var field : featureContent) {
doc.put(field.getKeyName(), DittoBsonJson.getInstance().parseValue(field.getValue()));
}
doc.put(FIELD_POLICY, evaluatedPolicy.forFeature(featureId));
return doc;
}
}