action.java

SkipOOMiniJOOL教学语言的编译器前端

package edu.ustc.cs.minijool.parser.ast;

/**
 * A node representing code for an action.
 * @author manu_s
 *
 */
public class Action extends DPASTNode {

	/**
	 * an empty action
	 */
	public static final Action NONE = new Action();
	
	/**
	 * the code for this action
	 */
	private final String actionCode;
	
	public Action(String actionCode) {
		this.actionCode = actionCode;
	}
	
	private Action() {
		this.actionCode = "";
	}
		
    /**
     * @return the code for this action
     */
    public String getActionCode() {
    	if (this != NONE) {
    		return actionCode;
    	} else {
    		throw new RuntimeException();
    	}
    }

    /* (non-Javadoc)
     * @see edu.berkeley.cs164.parser.ast.DCASTNode#accept(edu.berkeley.cs164.parser.ast.DCVisitor)
     */
    public void accept(DPVisitor v) {
    	v.visit(this);
    }

}