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AbstractWriteModel.java
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AbstractWriteModel.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.model;
import java.util.Objects;
import java.util.Optional;
import javax.annotation.Nullable;
import org.bson.BsonDocument;
import org.bson.BsonString;
import org.bson.conversions.Bson;
import org.eclipse.ditto.thingsearch.service.persistence.PersistenceConstants;
import org.eclipse.ditto.thingsearch.service.updater.actors.MongoWriteModel;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.WriteModel;
/**
* Interface for write models of Thing changes for MongoDB.
*/
public abstract class AbstractWriteModel {
/**
* MongoDB operator for setting a field.
*/
public static final String SET = "$set";
private final Metadata metadata;
/**
* Initialize metadata of the write model.
*
* @param metadata the metadata.
*/
protected AbstractWriteModel(final Metadata metadata) {
this.metadata = metadata;
}
/**
* Convert this description of a Thing search index change into a MongoDB write model.
*
* @return MongoDB write model.
*/
public abstract WriteModel<BsonDocument> toMongo();
/**
* Convert this into a MongoDB write model taking the previous update into consideration.
*
* @param previousWriteModel The previous write model.
* @return Either the MongoDB write model of this object or an incremental update converting the document of
* the previous model into this one.
*/
public Optional<MongoWriteModel> toIncrementalMongo(@Nullable final AbstractWriteModel previousWriteModel) {
return Optional.of(MongoWriteModel.of(this, toMongo(), false));
}
/**
* @return Metadata of this write model.
*/
public Metadata getMetadata() {
return metadata;
}
/**
* Get the filter of this write model.
*
* @return filter on search index documents.
*/
public Bson getFilter() {
return Filters.eq(PersistenceConstants.FIELD_ID, new BsonString(metadata.getThingId().toString()));
}
@Override
public boolean equals(@Nullable final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final AbstractWriteModel that = (AbstractWriteModel) o;
return Objects.equals(metadata, that.metadata);
}
@Override
public int hashCode() {
return Objects.hash(metadata);
}
@Override
public String toString() {
return getClass().getSimpleName() + "[" +
"metadata=" + metadata;
}
}