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A client-side Java library to interact with Scalar DL network.

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package com.scalar.dl.client.tool;

import com.scalar.dl.client.exception.ClientException;
import com.scalar.dl.ledger.service.StatusCode;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonValue;
import javax.json.JsonWriter;
import javax.json.JsonWriterFactory;
import javax.json.stream.JsonGenerator;

public class Common {
  static String STATUS_CODE_KEY = "status_code";
  static String OUTPUT_KEY = "output";
  static String ERROR_MESSAGE_KEY = "error_message";

  static void printOutput(JsonValue value) {
    printOutput(StatusCode.OK, value);
  }

  static void printOutput(StatusCode code, JsonValue value) {
    JsonObject json =
        Json.createObjectBuilder()
            .add(Common.STATUS_CODE_KEY, code.toString())
            .add(Common.OUTPUT_KEY, value)
            .add(Common.ERROR_MESSAGE_KEY, JsonValue.NULL)
            .build();
    printJson(json);
  }

  static void printError(ClientException e) {
    JsonObject json =
        Json.createObjectBuilder()
            .add(Common.STATUS_CODE_KEY, e.getStatusCode().toString())
            .add(Common.OUTPUT_KEY, JsonValue.NULL)
            .add(Common.ERROR_MESSAGE_KEY, e.getMessage())
            .build();
    printJson(json);
  }

  static void printJson(JsonObject json) {
    Map properties = new HashMap<>();
    properties.put(JsonGenerator.PRETTY_PRINTING, true);
    JsonWriterFactory writerFactory = Json.createWriterFactory(properties);
    StringWriter stringWriter = new StringWriter();
    JsonWriter jsonWriter = writerFactory.createWriter(stringWriter);
    jsonWriter.writeObject(json);
    System.out.println(stringWriter.toString().trim());
  }
}