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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;

import java.io.Serializable;
import java.util.*;

/**
 * Factory for vending Collections.  It's a class instead of an interface because I guessed that it'd primarily be used for its inner classes.
 *
 * @author Dan Klein ([email protected])
 */
public abstract class CollectionFactory implements Serializable {

  private static final long serialVersionUID = 3711321773145894069L;
  @SuppressWarnings("unchecked")
  public static final CollectionFactory ARRAY_LIST_FACTORY = new ArrayListFactory();
  @SuppressWarnings("unchecked")
  public static final CollectionFactory LINKED_LIST_FACTORY = new LinkedListFactory();
  @SuppressWarnings("unchecked")
  public static final CollectionFactory HASH_SET_FACTORY = new HashSetFactory();
  @SuppressWarnings("unchecked")
  public static final CollectionFactory TREE_SET_FACTORY = new TreeSetFactory();


  public abstract Collection newCollection();

  public abstract Collection newEmptyCollection();


  /** Return a factory for making ArrayList Collections.
   *  This method allows type safety in calling code.
   *
   *  @return A factory for ArrayList collections.
   */
  public static  CollectionFactory arrayListFactory() {
    return ErasureUtils.uncheckedCast(ARRAY_LIST_FACTORY);
  }

  public static  CollectionFactory arrayListFactory(int size) {
    return ErasureUtils.uncheckedCast(new SizedArrayListFactory(size));
  }

  public static  CollectionFactory linkedListFactory() {
    return ErasureUtils.uncheckedCast(LINKED_LIST_FACTORY);
  }

  public static  CollectionFactory hashSetFactory() {
    return ErasureUtils.uncheckedCast(HASH_SET_FACTORY);
  }

  public static  CollectionFactory treeSetFactory() {
    return ErasureUtils.uncheckedCast(TREE_SET_FACTORY);
  }

  public static class ArrayListFactory extends CollectionFactory {
    private static final long serialVersionUID = 1L;

    @Override
    public Collection newCollection() {
      return new ArrayList<>();
    }

    @Override
    public Collection newEmptyCollection() {
      return Collections.emptyList();
    }
  }

  public static class SizedArrayListFactory extends CollectionFactory {
    private static final long serialVersionUID = 1L;
    private int defaultSize = 1;

    public SizedArrayListFactory(int size)
    {
      this.defaultSize = size;
    }

    @Override
    public Collection newCollection() {
      return new ArrayList<>(defaultSize);
    }

    @Override
    public Collection newEmptyCollection() {
      return Collections.emptyList();
    }
  }

  public static class LinkedListFactory extends CollectionFactory {
    private static final long serialVersionUID = -4236184979948498000L;

    @Override
    public Collection newCollection() {
      return new LinkedList<>();
    }

    @Override
    public Collection newEmptyCollection() {
      return Collections.emptyList();
    }
  }


  public static class HashSetFactory extends CollectionFactory {
    private static final long serialVersionUID = -6268401669449458602L;

    @Override
    public Collection newCollection() {
      return Generics.newHashSet();
    }

    @Override
    public Collection newEmptyCollection() {
      return Collections.emptySet();
    }
  }

  public static class TreeSetFactory extends CollectionFactory {
    private static final long serialVersionUID = -3451920268219478134L;

    @Override
    public Collection newCollection() {
      return new TreeSet<>();
    }

    @Override
    public Collection newEmptyCollection() {
      return Collections.emptySet();
    }
  }

}