content: /*
   * 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.beam.runners.dataflow.worker.apiary;
  
  import java.util.List;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  
  /**
   * Static convenience methods to work around default encodings done by Apiary for default fields.
   */
  public class Apiary {
    /**
     * Returns an empty list if list is null otherwise returns the list. Apiary encodes empty lists as
     * null. This function simplifies handling list fields by treating nulls as empty lists.
     */
    public static <V> List<V> listOrEmpty(List<V> list) {
      return list == null ? ImmutableList.<V>of() : list;
    }
  
    /**
     * Apiary fields with default values returns null instead of 0 for integer types. This function
     * simplifies handling {@code int} fields by returning the default of 0.
     */
    public static int intOrZero(Integer value) {
      if (value == null) {
        return 0;
      }
      return value;
    }
  }
  