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 org.apache.beam.sdk.runners.AppliedPTransform;
  import org.apache.beam.sdk.values.WindowedValue;
  
  class PassthroughTransformEvaluator<InputT> implements TransformEvaluator<InputT> {
    public static <InputT> PassthroughTransformEvaluator<InputT> create(
        AppliedPTransform<?, ?, ?> transform, UncommittedBundle<InputT> output) {
      return new PassthroughTransformEvaluator<>(transform, output);
    }
  
    private final AppliedPTransform<?, ?, ?> transform;
    private final UncommittedBundle<InputT> output;
  
    private PassthroughTransformEvaluator(
        AppliedPTransform<?, ?, ?> transform, UncommittedBundle<InputT> output) {
      this.transform = transform;
      this.output = output;
    }
  
    @Override
    public void processElement(WindowedValue<InputT> element) throws Exception {
      output.add(element);
    }
  
    @Override
    public TransformResult<InputT> finishBundle() throws Exception {
      return StepTransformResult.<InputT>withoutHold(transform).addOutput(output).build();
    }
  }
  