package rac;

/**
 * The policy produces queue (FIFO) behavior in a a RACont.
 * @author S. Wong
 */
public class QueuePolicy extends ARACPolicy {
    /**
    * The RACont will dispatch its store(data) method through this method to
    * perform the data store operation.
    * @param data The data to be stored in the RACont.
    * @param stopNode The RACStopNode that is the head/tail of this internal
    * doubly-linked circular data list of the RACont.
    */
    public void store(Object data, RACStopNode stopNode) {
        stopNode.insertPrevious(data);
    }

    /**
    * The RACont will dispatch its retrieve() method through this method to
    * perform the data retrieval operation.
    * @param stopNode The RACStopNode that is the head/tail of this internal
    * doubly-linked circular data list of the RACont.
    * @return The data value found.
    */
    public Object retrieve(RACStopNode stopNode) {
        return stopNode.getNext().removeNode();
    }
}