net.pincette.mongo.streams.Out Maven / Gradle / Ivy

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package net.pincette.mongo.streams;

import static net.pincette.json.JsonUtil.asString;
import static net.pincette.json.JsonUtil.createObjectBuilder;
import static net.pincette.json.JsonUtil.isString;
import static net.pincette.mongo.streams.Util.ID;
import static net.pincette.util.Util.must;

import java.util.concurrent.Flow.Processor;
import javax.json.JsonObject;
import javax.json.JsonValue;
import net.pincette.rs.streams.Message;

/**
 * The $out operator.
 *
 * @author Werner Donné
 */
class Out {
  private static final String INSERT = "insert";
  private static final String INTO = "into";
  private static final String ON = "on";
  private static final String REPLACE = "replace";
  private static final String WHEN_MATCHED = "whenMatched";
  private static final String WHEN_NOT_MATCHED = "whenNotMatched";

  private Out() {}

  static Processor, Message> stage(
      final JsonValue expression, final Context context) {
    must(isString(expression));

    return Merge.stage(
        createObjectBuilder()
            .add(INTO, asString(expression).getString())
            .add(ON, ID)
            .add(WHEN_MATCHED, REPLACE)
            .add(WHEN_NOT_MATCHED, INSERT)
            .build(),
        context);
  }
}