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.euphoria.core.translate.collector;
  
  import static java.util.Objects.requireNonNull;
  
  import java.io.Serializable;
  import javax.annotation.concurrent.NotThreadSafe;
  import org.apache.beam.sdk.extensions.euphoria.core.annotation.audience.Audience;
  import org.apache.beam.sdk.extensions.euphoria.core.client.accumulators.AccumulatorProvider;
  import org.apache.beam.sdk.extensions.euphoria.core.client.accumulators.Counter;
  import org.apache.beam.sdk.extensions.euphoria.core.client.accumulators.Histogram;
  import org.apache.beam.sdk.extensions.euphoria.core.client.accumulators.Timer;
  import org.apache.beam.sdk.extensions.euphoria.core.client.io.Collector;
  import org.apache.beam.sdk.extensions.euphoria.core.client.io.Context;
  import org.apache.beam.sdk.transforms.DoFn;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * Implementation of {@link Collector} which forwards output elements through {@link
   * CollectorAdapter} to given {@link DoFn.ProcessContext}. The {@link DoFn.ProcessContext} needs to
   * be set by {@link AdaptableCollector#setProcessContext(DoFn.ProcessContext)} manually before use.
   *
   * @deprecated Use Java SDK directly, Euphoria is scheduled for removal in a future release.
   */
  @NotThreadSafe
  @Audience(Audience.Type.EXECUTOR)
  @SuppressWarnings({
    "nullness" // TODO(https://github.com/apache/beam/issues/20497)
  })
  @Deprecated
  public class AdaptableCollector<InputT, OutputT, ElemT>
      implements Collector<ElemT>, Context, Serializable {
  
    private static final String UNSUPPORTED = "Accumulators are supported for named operators only.";
  
    private final AccumulatorProvider accumulators;
    private final CollectorAdapter<InputT, OutputT, ElemT> adapter;
    private final @Nullable String operatorName;
    private transient DoFn<InputT, OutputT>.ProcessContext context;
  
    public AdaptableCollector(
        AccumulatorProvider accumulators,
        @Nullable String operatorName,
        CollectorAdapter<InputT, OutputT, ElemT> adapter) {
      this.accumulators = accumulators;
      this.operatorName = operatorName;
      this.adapter = adapter;
    }
  
    @Override
    public void collect(ElemT elem) {
      adapter.collect(requireNonNull(context), elem);
    }
  
    @Override
    public Context asContext() {
      return this;
    }
  
    @Override
    public Counter getCounter(String name) {
      return accumulators.getCounter(requireNonNull(operatorName, UNSUPPORTED), name);
    }
  
    @Override
    public Histogram getHistogram(String name) {
      return accumulators.getHistogram(requireNonNull(operatorName, UNSUPPORTED), name);
    }
  
    @Override
    public Timer getTimer(String name) {
      throw new UnsupportedOperationException("Timer not supported. Use histogram instead.");
    }
  
    public void setProcessContext(DoFn<InputT, OutputT>.ProcessContext context) {
      this.context = requireNonNull(context);
    }
  }
  