Stack.java

/*
 * Copyright 2013 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<T> implements Iterable<T> {
  private final ArrayList<T> _list;

  public Stack() {
    _list = new ArrayList<T>();
  }

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

  public Stack( ArrayList<T> 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<T> 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<T> toList()
  {
    return new ArrayList<T>( _list );
  }

}