/*
 * 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.hudi.sink.utils;

import org.apache.hudi.adapter.OutputAdapter;

import org.apache.flink.streaming.api.operators.Output;
import org.apache.flink.streaming.api.watermark.Watermark;
import org.apache.flink.streaming.runtime.streamrecord.LatencyMarker;
import org.apache.flink.streaming.runtime.streamrecord.StreamRecord;
import org.apache.flink.util.OutputTag;

import java.util.ArrayList;
import java.util.List;

/**
 * Collecting {@link Output} for {@link StreamRecord}.
 */
public class CollectorOutput<T> implements OutputAdapter<StreamRecord<T>> {

  private final List<T> records;

  public CollectorOutput() {
    this.records = new ArrayList<>();
  }

  public List<T> getRecords() {
    return this.records;
  }

  @Override
  public void emitWatermark(Watermark mark) {
    // no operation
  }

  @Override
  public void emitLatencyMarker(LatencyMarker latencyMarker) {
    // no operation
  }

  @Override
  public void collect(StreamRecord<T> record) {
    records.add(record.getValue());
  }

  @Override
  public <X> void collect(OutputTag<X> outputTag, StreamRecord<X> record) {
    throw new UnsupportedOperationException("Side output not supported for CollectorOutput");
  }

  @Override
  public void close() {
    this.records.clear();
  }
}
