commandnode.java

23种java设计模式

package language;

// <command> ::= <repeat command> | <primitive command>
public class CommandNode extends Node {
    private Node node;
    public void parse(Context context) throws ParseException {
        if (context.currentToken().equals("repeat")) {
            node = new RepeatCommandNode();
            node.parse(context);
        } else {
            node = new PrimitiveCommandNode();
            node.parse(context);
        }
    }
    public void execute() throws ExecuteException {
        node.execute();
    }
    public String toString() {
        return node.toString();
    }
}