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.testing;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.sdk.io.range.OffsetRange;
  import org.apache.beam.sdk.options.PipelineOptions;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.transforms.View;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.PCollectionView;
  import org.apache.beam.sdk.values.PCollectionViews.ValueOrMetadata;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableSet;
  
  /** Methods for testing {@link PCollectionView}s. */
  public final class PCollectionViewTesting {
    public static List<Object> materializeValuesFor(
        PipelineOptions options,
        PTransform<?, ? extends PCollectionView<?>> viewTransformClass,
        Object... values) {
      List<Object> rval = new ArrayList<>();
      // Map values to the materialized format that is expected by each view type. These
      // materializations will differ but test code should not worry about what these look like if
      // they are relying on the ViewFn to "undo" the conversion.
  
      if (View.AsSingleton.class.equals(viewTransformClass.getClass())) {
        for (Object value : values) {
          rval.add(value);
        }
      } else if (View.AsIterable.class.equals(viewTransformClass.getClass())) {
        for (Object value : values) {
          rval.add(value);
        }
      } else if (View.AsList.class.equals(viewTransformClass.getClass())) {
        if (values.length > 0) {
          rval.add(
              KV.of(
                  Long.MIN_VALUE, ValueOrMetadata.createMetadata(new OffsetRange(0, values.length))));
          for (int i = 0; i < values.length; ++i) {
            rval.add(KV.of((long) i, ValueOrMetadata.create(values[i])));
          }
        }
      } else if (View.AsMap.class.equals(viewTransformClass.getClass())) {
        for (Object value : values) {
          rval.add(value);
        }
      } else if (View.AsMultimap.class.equals(viewTransformClass.getClass())) {
        for (Object value : values) {
          rval.add(value);
        }
      } else {
        throw new IllegalArgumentException(
            String.format(
                "Unknown type of view %s. Supported views are %s.",
                viewTransformClass.getClass(),
                ImmutableSet.of(
                    View.AsSingleton.class,
                    View.AsIterable.class,
                    View.AsList.class,
                    View.AsMap.class,
                    View.AsMultimap.class)));
      }
      return Collections.unmodifiableList(rval);
    }
  }
  