vectorenumeration.java

来自「Java写的词法/语法分析器。可生成JAVA语言或者是C++的词法和语法分析器。」· Java 代码 · 共 38 行

package antlr.collections.impl;

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/RIGHTS.html
 *
 * $Id: //depot/code/org.antlr/release/antlr-2.7.0/antlr/collections/impl/VectorEnumeration.java#1 $
 */

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

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


	VectorEnumeration(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");
		}
	}
}