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Templates for consuming from and producing to MongoDB with Swim

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// Copyright 2015-2024 Nstream, inc.
//
// Licensed under the Redis Source Available License 2.0 (RSALv2) Agreement;
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://redis.com/legal/rsalv2-agreement/
//
// 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 nstream.adapter.mongodb;

import com.mongodb.client.model.changestream.ChangeStreamDocument;
import org.bson.BsonDocument;
import org.bson.Document;
import swim.json.Json;
import swim.structure.Record;
import swim.structure.Value;

/**
 * Provides static utility methods used by the MongoDB connector.
 */
public final class MongoDbAdapterUtils {

  private MongoDbAdapterUtils() {
  }

  public static Value structureKey(BsonDocument key) {
    return (key == null ? Value.extant() : Json.parse(key.toJson()));
  }

  public static Value structureDocument(Document document) {
    return document == null ? Value.extant() : Json.parse(document.toJson());
  }

  public static Value structureChangeDocument(ChangeStreamDocument document) {
    return Record.create(3)
        .slot("key", structureKey(document.getDocumentKey()))
        .slot("value", structureDocument(document.getFullDocument()))
        .slot("old", structureDocument(document.getFullDocumentBeforeChange()));
  }

}