heron/tools/apiserver/src/java/org/apache/heron/apiserver/utils/Utils.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.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();

  }
}