heron/tools/apiserver/src/java/com/twitter/heron/apiserver/utils/Utils.java

//  Copyright 2017 Twitter. All rights reserved.
//
//  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.twitter.heron.apiserver.utils;

import java.util.List;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

public final class Utils {

  private Utils() {

  }

  public static ObjectNode createBaseMessage(String message) {
    final ObjectMapper mapper = new ObjectMapper();
    return mapper.createObjectNode().put("message", message);
  }

  public static String createMessage(String message) {
    return createBaseMessage(message).toString();
  }

  public static String createValidationError(String message, List<String> missing) {
    ObjectNode node = createBaseMessage(message);
    ObjectNode errors = node.putObject("errors");
    ArrayNode missingParameters = errors.putArray("missing_parameters");
    for (String param : missing) {
      missingParameters.add(param);
    }

    return node.toString();
  }

  public static boolean isNotEmpty(String str) {
    return str != null && !str.isEmpty();

  }
}