/*
 * 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.gobblin.util;

import org.apache.gobblin.configuration.ConfigurationKeys;
import org.apache.gobblin.configuration.State;
import org.apache.gobblin.runtime.api.TaskEventMetadataGenerator;

public class TaskEventMetadataUtils {
  /**
   * Construct a {@link TaskEventMetadataGenerator} from the task state.
   * @param taskState
   * @return
   */
  public static TaskEventMetadataGenerator getTaskEventMetadataGenerator(State taskState) {
    String taskEventMetadataGeneratorClassName =
        taskState.getProp(ConfigurationKeys.TASK_EVENT_METADATA_GENERATOR_CLASS_KEY,
            ConfigurationKeys.DEFAULT_TASK_EVENT_METADATA_GENERATOR_CLASS_KEY);
    ClassAliasResolver<TaskEventMetadataGenerator> aliasResolver =
        new ClassAliasResolver<>(TaskEventMetadataGenerator.class);
    try {
      return aliasResolver.resolveClass(taskEventMetadataGeneratorClassName).newInstance();
    } catch (ReflectiveOperationException e) {
      throw new RuntimeException("Could not construct TaskEventMetadataGenerator " +
          taskEventMetadataGeneratorClassName, e);
    }
  }
}
