org.deeplearning4j.text.documentiterator.LabelAwareIteratorWrapper Maven / Gradle / Ivy

package org.deeplearning4j.text.documentiterator;

import java.util.List;

/**
 * LabelAwareIterator wrapper which populates a LabelsSource while iterating.
 *
 * @author Benjamin Possolo
 */
public class LabelAwareIteratorWrapper implements LabelAwareIterator {

  private final LabelAwareIterator delegate;
  private final LabelsSource sink;
  
  public LabelAwareIteratorWrapper(LabelAwareIterator delegate, LabelsSource sink) {
    this.delegate = delegate;
    this.sink = sink;
  }

  @Override
  public boolean hasNext() {
    return delegate.hasNext();
  }

  @Override
  public boolean hasNextDocument() {
    return delegate.hasNextDocument();
  }

  @Override
  public LabelsSource getLabelsSource() {
    return sink;
  }

  @Override
  public LabelledDocument next() {
    return nextDocument();
  }

  @Override
  public LabelledDocument nextDocument() {
    LabelledDocument doc = delegate.nextDocument();
    List labels = doc.getLabels();
    if (labels != null) {
      for (String label : labels) {
        sink.storeLabel(label);
      }
    }
    return doc;
  }

  @Override
  public void reset() {
    delegate.reset();
    sink.reset();
  }

  @Override
  public void shutdown() {}
}