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Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

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package edu.stanford.nlp.util.logging;

import edu.stanford.nlp.util.logging.Redwood.Record;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.List;

/**
 * A filter for selecting which channels are visible. This class
 * behaves as an "or" filter; that is, if any of the filters are considered
 * valid, it allows the Record to proceed to the next handler.
 *
 * @author Gabor Angeli (angeli at cs.stanford)
 */
public class VisibilityHandler extends LogRecordHandler {

  private enum State { SHOW_ALL, HIDE_ALL }

  private VisibilityHandler.State defaultState = State.SHOW_ALL;
  private final Set deltaPool = new HashSet<>();  // replacing with Generics.newHashSet() makes classloader go haywire?

  public VisibilityHandler() { }  // default is SHOW_ALL

  public VisibilityHandler(Object[] channels) {
    if (channels.length > 0) {
      defaultState = State.HIDE_ALL;
      Collections.addAll(deltaPool, channels);
    }
  }

  /**
   * Show all of the channels.
   */
  public void showAll() {
    this.defaultState = State.SHOW_ALL;
    this.deltaPool.clear();
  }

  /**
   * Show none of the channels
   */
  public void hideAll() {
    this.defaultState = State.HIDE_ALL;
    this.deltaPool.clear();
  }

  /**
   * Show all the channels currently being printed, in addition
   * to a new one
   * @param filter The channel to also show
   * @return true if this channel was already being shown.
   */
  public boolean alsoShow(Object filter) {
    switch(this.defaultState){
    case HIDE_ALL:
      return this.deltaPool.add(filter);
    case SHOW_ALL:
      return this.deltaPool.remove(filter);
    default:
      throw new IllegalStateException("Unknown default state setting: " + this.defaultState);
    }
  }

  /**
   * Show all the channels currently being printed, with the exception
   * of this new one
   * @param filter The channel to also hide
   * @return true if this channel was already being hidden.
   */
  public boolean alsoHide(Object filter) {
    switch(this.defaultState){
    case HIDE_ALL:
      return this.deltaPool.remove(filter);
    case SHOW_ALL:
      return this.deltaPool.add(filter);
    default:
      throw new IllegalStateException("Unknown default state setting: " + this.defaultState);
    }
  }

  /** {@inheritDoc} */
  @Override
  public List handle(Record record) {
    boolean isPrinting = false;
    if(record.force()){
      //--Case: Force Printing
      isPrinting = true;
    } else {
      //--Case: Filter
      switch (this.defaultState){
        case HIDE_ALL:
          //--Default False
          for(Object tag : record.channels()){
            if(this.deltaPool.contains(tag)){
              isPrinting = true;
              break;
            }
          }
          break;
        case SHOW_ALL:
          //--Default True
          if (!this.deltaPool.isEmpty()) {  // Short-circuit for efficiency
            boolean somethingSeen =  false;
            for (Object tag : record.channels()) {
              if (this.deltaPool.contains(tag)) {
                somethingSeen = true;
                break;
              }
            }
            isPrinting = !somethingSeen;
          } else {
            isPrinting = true;
          }
          break;
        default:
          throw new IllegalStateException("Unknown default state setting: " + this.defaultState);
      }
    }
    //--Return
    if(isPrinting){
      return Collections.singletonList(record);
    } else {
      return EMPTY;
    }
  }

  /** {@inheritDoc} */
  @Override
  public List signalStartTrack(Record signal) {
    return EMPTY;
  }
  /** {@inheritDoc} */
  @Override
  public List signalEndTrack(int newDepth, long timeOfEnd) {
    return EMPTY;
  }

}
 















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