w3c.model.www.pep.altlib.ArrayEnumeration

// ArrayEnumeration.java
// $Id: ArrayEnumeration.java,v 1.1 1997/07/21 21:55:30 eric Exp $
// (c) COPYRIGHT MIT and INRIA, 1996.
// Please first read the full copyright statement in file COPYRIGHT.html

package w3c.model.www.pep.altlib;

import java.util.* ;

/** Iterates through array skipping nulls. */
public class ArrayEnumeration implements Enumeration 
    private int nelems ;
    private int elemCount ;
    private int arrayIdx ;
    private Object array ;[]

    public ArrayEnumeration([[] ) {
	this(array,array.length) ;
    }

    public ArrayEnumeration([[] ,arrayint) {
	arrayIdx = elemCount = 0 ;
	this.nelems = nelems ;
	this.array = array ;
    }

    public final boolean hasMoreElements() {
	return elemCount<nelems ;
    }

    public final Object nextElement() {
	while(array[arrayIdx]==null && arrayIdx<array.length))
	    arrayIdx++ ;

	if(arrayIdx>=array.length))
	    throw  NoSuchElementException() ;

	elemCount++;
	return array[arrayIdx++] ;
    }