commandlistnode.java

来自「<设计模式-Java语言中的应用> 的源码」· Java 代码 · 共 24 行

import java.util.Vector;

// <command list> ::= <command>* end
public class CommandListNode extends Node {
    private Vector list = new Vector();
    public void parse(Context context) throws ParseException {
        while (true) {
            if (context.currentToken() == null) {
                throw new ParseException("Missing 'end'");
            } else if (context.currentToken().equals("end")) {
                context.skipToken("end");
                break;
            } else {
                Node commandNode = new CommandNode();
                commandNode.parse(context);
                list.add(commandNode);
            }
        }
    }
    public String toString() {
        return "" + list;
    }
}