vectorenumerator.java

来自「SRI international 发布的OAA框架软件」· Java 代码 · 共 38 行

package antlr_oaa.collections.impl;

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/RIGHTS.html
 *
 * $Id: VectorEnumerator.java,v 1.1 2002/11/08 17:37:17 agno Exp $
 */

import java.util.Enumeration;
import java.util.NoSuchElementException;
import antlr_oaa.collections.Enumerator;

// based on java.lang.Vector; returns any null indices between non-null ones.
class VectorEnumerator implements Enumeration {
	Vector vector;
	int i;


	VectorEnumerator(Vector v) {
		vector = v;
		i = 0;
	}
	public boolean hasMoreElements() {
		synchronized (vector) {
			return i <= vector.lastElement;
		}
	}
	public Object nextElement() {
		synchronized (vector) {
			if (i <= vector.lastElement) {
				return vector.data[i++];
			}
			throw new NoSuchElementException("VectorEnumerator");
		}
	}
}