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package org.bukkit.craftbukkit.util;

import java.util.Collection;
import java.util.Iterator;
import java.util.Set;


public abstract class LazyHashSet implements Set {
  Set reference = null;

  public int size() {
    return getReference().size();
  }

  public boolean isEmpty() {
    return getReference().isEmpty();
  }

  public boolean contains(Object o) {
    return getReference().contains(o);
  }

  public Iterator iterator() {
    return getReference().iterator();
  }

  public Object[] toArray() {
    return getReference().toArray();
  }

  public  T[] toArray(T[] a) {
    return getReference().toArray(a);
  }

  public boolean add(E o) {
    return getReference().add(o);
  }

  public boolean remove(Object o) {
    return getReference().remove(o);
  }

  public boolean containsAll(Collection c) {
    return getReference().containsAll(c);
  }

  public boolean addAll(Collection c) {
    return getReference().addAll(c);
  }

  public boolean retainAll(Collection c) {
    return getReference().retainAll(c);
  }

  public boolean removeAll(Collection c) {
    return getReference().removeAll(c);
  }

  public void clear() {
    getReference().clear();
  }

  public Set getReference() {
    Set reference = this.reference;
    if (reference != null) {
      return reference;
    }
    return this.reference = makeReference();
  }

  abstract Set makeReference();

  public boolean isLazy() {
    return reference == null;
  }

  @Override
  public int hashCode() {
    return 157 * getReference().hashCode();
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == this) {
      return true;
    }
    if (obj == null || this.getClass() != obj.getClass()) {
      return false;
    }
    LazyHashSet that = (LazyHashSet) obj;
    return (this.isLazy() && that.isLazy()) || this.getReference().equals(that.getReference());
  }

  @Override
  public String toString() {
    return getReference().toString();
  }
}