/**
 * 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.metron.common.field.transformation;

import com.google.common.collect.Iterables;
import org.apache.metron.common.dsl.Context;

import java.util.List;
import java.util.Map;

public abstract class SimpleFieldTransformation implements FieldTransformation {
  @Override
  public Map<String, Object> map (Map<String, Object> input
                                , List<String> outputField
                                , Map<String, Object> fieldMappingConfig
                                , Map<String, Object> sensorConfig
                                , Context context
                                )
  {
    Object value = (input == null || input.values() == null && input.values().isEmpty())
                 ? null
                 : Iterables.getFirst(input.values(), null)
                 ;
    return map(value, outputField.get(0));
  }

  public abstract Map<String, Object> map(Object input, String outputField);
}
