com.everydots.kafka.connect.mongodb.processor.id.strategy.ProvidedStrategy.java Source code

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Here is the source code for com.everydots.kafka.connect.mongodb.processor.id.strategy.ProvidedStrategy.java

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/*
 * Copyright (c) 2017. Hans-Peter Grahsl (grahslhp@gmail.com)
 *
 * 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.everydots.kafka.connect.mongodb.processor.id.strategy;

import com.everydots.kafka.connect.mongodb.converter.SinkDocument;
import com.mongodb.DBCollection;
import org.apache.kafka.connect.errors.DataException;
import org.apache.kafka.connect.sink.SinkRecord;
import org.bson.BsonDocument;
import org.bson.BsonNull;
import org.bson.BsonValue;

import java.util.Optional;

public class ProvidedStrategy implements IdStrategy {

    protected enum ProvidedIn {
        KEY, VALUE
    }

    protected ProvidedIn where;

    public ProvidedStrategy(ProvidedIn where) {
        this.where = where;
    }

    @Override
    public BsonValue generateId(SinkDocument doc, SinkRecord orig) {

        Optional<BsonDocument> bd = Optional.empty();

        if (where.equals(ProvidedIn.KEY)) {
            bd = doc.getKeyDoc();
        }

        if (where.equals(ProvidedIn.VALUE)) {
            bd = doc.getValueDoc();
        }

        BsonValue _id = bd.map(vd -> vd.get(DBCollection.ID_FIELD_NAME))
                .orElseThrow(() -> new DataException("error: provided id strategy is used "
                        + "but the document structure either contained no _id field or it was null"));

        if (_id instanceof BsonNull) {
            throw new DataException("error: provided id strategy used "
                    + "but the document structure contained an _id of type BsonNull");
        }

        return _id;

    }

}