PilaLinkedCounter

/**
 * @file PilaLinkedCounter.java
 * @brief Fuente de la clase genérica PilaLinkedCounter.
 */
package lab01;

/**
 * Clase genérica de pilas.
 *
 * Esta clase implementa la pila a través de elementos enlazados.
 * @param T Tipo de los elementos en la pila.
 * @since 5/18/2015
 */
public class PilaLinkedCounter<T> implements InterfacePila<T> {

    /**
     * Referencia al elemento al tope de la pila.
     */
    public  PilaLinkedCounter() {
        tope=null;
        counter = new Counter();

    }
    public PilaLinkedCounter(Counter counter) {
        tope= null;
        this.counter=counter;

    }

    Elemento<T> tope;
    Counter counter;
    public Counter getCounter() {
        return counter;
    }

    public void setCounter(Counter counter) {
        this.counter = counter;
    }

    /**
     * Crea una pila vacía.
     */


    /* (non-Javadoc)
     * @see lab01.InterfacePila#push(java.lang.Object)
     */
    @Override
    public InterfacePila<T> push(T t) throws IllegalArgumentException {
        counter.inc();
        if ( t == null )
            throw new IllegalArgumentException("Null can't be inserted.");
        Elemento<T> e= new Elemento<T>();
        e.value= t;
        e.below= tope;
        tope= e;
        counter.inc(5);
        return this;
    }

    /* (non-Javadoc)
     * @see lab01.InterfacePila#peek()
     */
    @Override
    public T peek() {
        counter.inc();
        if ( tope == null )
            return null;
        counter.inc();
        return tope.value;
    }

    /* (non-Javadoc)
     * @see lab01.InterfacePila#pop()
     */
    @Override
    public T pop() {
        counter.inc();
        if ( tope == null )
            return null;
        T t= tope.value;
        tope= tope.below;
        counter.inc(3);
        return t;
    }

}