package rac;

/**
 * Shows the String content of the circular list.
 */
public class ToString implements IRACVisitor {

    /**
     * Singleton pattern.
     */
    public static final ToString Singleton = new ToString();
    private  ToString() {
    }

    /**
     * Returns the empty String.
     * @param nu not used
     * @return String
     */
    public Object stopCase(RACStopNode host, Object nu) {
        return "";
    }

    /**
     * Prints each element in the circular list one per line.
     * @param nu not used
     * @return String
     */
    public Object dataCase(RACDataNode host, Object nu) {
        return host.getData() + "\n" + host.getNext().execute(this, null);
    }
}