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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();
    }
  }

}