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.spark.io;
  
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PDone;
  
  /** Print to console. */
  public final class ConsoleIO {
  
    private ConsoleIO() {}
  
    /** Write to console. */
    public static final class Write {
  
      private static final int DEFAULT_NUM = 10;
  
      private Write() {}
  
      /** Prints {@value #DEFAULT_NUM} elements from the {@link PCollection} to the console. */
      public static <T> Unbound<T> out() {
        return new Unbound<>(DEFAULT_NUM);
      }
  
      /** Prints {@code num} elements from the {@link PCollection} to stdout. */
      public static <T> Unbound<T> out(int num) {
        return new Unbound<>(num);
      }
  
      /**
       * {@link PTransform} writing {@link PCollection} to the console.
       *
       * @param <T> the type of the elements in the {@link PCollection}
       */
      public static class Unbound<T> extends PTransform<PCollection<T>, PDone> {
        public static final String TRANSFORM_URN = "beam:transform:spark:consoleio_write_unbound:v1";
  
        private final int num;
  
        Unbound(int num) {
          this.num = num;
        }
  
        public int getNum() {
          return num;
        }
  
        @Override
        public PDone expand(PCollection<T> input) {
          return PDone.in(input.getPipeline());
        }
      }
    }
  }
  