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.direct;
  
  import java.util.Collection;
  import java.util.Collections;
  import org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.transforms.PTransform;
  import org.apache.beam.sdk.values.PCollection;
  import org.apache.beam.sdk.values.PCollectionList;
  
  /** A {@link RootInputProvider} that provides no input bundles. */
  class EmptyInputProvider<T> implements RootInputProvider<T, Void, PCollectionList<T>> {
    EmptyInputProvider() {}
  
    /**
     * {@inheritDoc}.
     *
     * <p>Returns an empty collection.
     */
    @Override
    public Collection<CommittedBundle<Void>> getInitialInputs(
        AppliedPTransform<
                PCollectionList<T>, PCollection<T>, PTransform<PCollectionList<T>, PCollection<T>>>
            transform,
        int targetParallelism) {
      return Collections.emptyList();
    }
  }
  