DummyExtractor.java

/*
 * 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 gobblin.source.extractor;

import java.io.IOException;

import gobblin.configuration.WorkUnitState;
import gobblin.instrumented.extractor.InstrumentedExtractor;


/**
 * Dummy extractor that always returns 0 records.
 */
public class DummyExtractor<S, D> extends InstrumentedExtractor<S, D> {

  public DummyExtractor(WorkUnitState workUnitState) {
    super(workUnitState);
  }

  @Override
  public S getSchema() throws IOException {
    return null;
  }

  @Override
  public long getExpectedRecordCount() {
    return 0;
  }

  @Override
  public long getHighWatermark() {
    return 0;
  }

  @Override
  public D readRecordImpl(D reuse) throws DataRecordException, IOException {
    return null;
  }
}