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/*
 * Copyright 2014 Guidewire Software, Inc.
 */

package gw.util;

import java.util.ArrayList;
import java.util.EmptyStackException;
import java.util.Iterator;
import java.util.List;

public class Stack implements Iterable {
  private final ArrayList _list;

  public Stack() {
    _list = new ArrayList();
  }

  public Stack( Stack source )
  {
    _list = new ArrayList( source._list );
  }

  public Stack( ArrayList list )
  {
    _list = list;
  }

  public boolean push(T item) {
    return _list.add(item);
  }

  public void insert(T item, int iPos) {
    _list.add(iPos, item);
  }

  public T pop() {
    if (isEmpty()) {
      throw new EmptyStackException();
    }
    return _list.remove(size() - 1);
  }

  public T peek() {
    if (isEmpty()) {
      throw new EmptyStackException();
    }
    return _list.get(size() - 1);
  }

  public T getBase() {
    if (isEmpty()) {
      throw new EmptyStackException();
    }
    return _list.get(0);
  }

  public boolean contains(T obj) {
    return _list.contains(obj);
  }

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

  public T get(int i) {
    return _list.get(i);
  }

  public int indexOf(T o) {
    return _list.indexOf(o);
  }

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

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

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

  @SuppressWarnings({"RedundantIfStatement"})
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    Stack stack = (Stack) o;

    if (!_list.equals(stack._list)) return false;

    return true;
  }

  public int hashCode() {
    return _list.hashCode();
  }

  public List toList()
  {
    return new ArrayList( _list );
  }

}