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.sdk.extensions.python.transforms;
  
  import org.apache.beam.sdk.extensions.python.PythonExternalTransform;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.util.PythonCallableSource;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.Row;
  
  /** Wrapper for invoking external Python {@code DataframeTransform}. */
  public class DataframeTransform extends PTransform<PCollection<Row>, PCollection<Row>> {
    private final String func;
    private final boolean includeIndexes;
    private final String expansionService;
  
    /**
     * Instantiates a multi-language wrapper for a Python DataframeTransform with a given lambda
     * function.
     *
     * @param func A Python lambda function that accepts Pandas dataframe object.
     * @return A {@link DataframeTransform} for the given lambda function.
     */
    public static DataframeTransform of(String func) {
      return new DataframeTransform(func, false, "");
    }
  
    /**
     * Sets include_indexes option for DataframeTransform.
     *
     * @return A {@link DataframeTransform} with include_indexes option enabled.
     */
    public DataframeTransform withIndexes() {
      return new DataframeTransform(func, true, expansionService);
    }
  
    /**
     * Sets an expansion service endpoint for DataframeTransform.
     *
     * @param expansionService A URL for a Python expansion service.
     * @return A {@link DataframeTransform} for the given expansion service endpoint.
     */
    public DataframeTransform withExpansionService(String expansionService) {
      return new DataframeTransform(func, includeIndexes, expansionService);
    }
  
    private DataframeTransform(String func, boolean includeIndexes, String expansionService) {
      this.func = func;
      this.includeIndexes = includeIndexes;
      this.expansionService = expansionService;
    }
  
    @Override
    public PCollection<Row> expand(PCollection<Row> input) {
      return input.apply(
          PythonExternalTransform.<PCollection<Row>, PCollection<Row>>from(
                  "apache_beam.dataframe.transforms.DataframeTransform", expansionService)
              .withKwarg("func", PythonCallableSource.of(func))
              .withKwarg("include_indexes", includeIndexes));
    }
  }
  