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.dataflow.worker;
  
  import org.apache.beam.runners.dataflow.worker.util.common.worker.ParDoFn;
  import org.apache.beam.runners.dataflow.worker.util.common.worker.Receiver;
  
  /**
   * A base class for {@link ParDoFn} implementations for overriding particular methods while
   * forwarding the rest to an existing instance.
   */
  public abstract class ForwardingParDoFn implements ParDoFn {
  
    private ParDoFn delegate;
  
    protected ForwardingParDoFn(ParDoFn delegate) {
      this.delegate = delegate;
    }
  
    @Override
    public void startBundle(Receiver... receivers) throws Exception {
      delegate.startBundle(receivers);
    }
  
    @Override
    public void processElement(Object elem) throws Exception {
      delegate.processElement(elem);
    }
  
    @Override
    public void processTimers() throws Exception {
      delegate.processTimers();
    }
  
    @Override
    public void finishBundle() throws Exception {
      delegate.finishBundle();
    }
  
    @Override
    public void abort() throws Exception {
      delegate.abort();
    }
  }
  