source: src/test/java/agents/nastyagent/StoreAndRetrieve.java

package agents.nastyagent;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;

import genius.core.AgentID;
import genius.core.Bid;
import genius.core.actions.Action;

/**
 * Checks if data is retained. This uses a hack. This agent must be used in only
 * 1 tournament.
 *
 * 
 */
public class StoreAndRetrieve extends NastyAgent {
        private static final String DATA = "data";

        static Set<String> runBefore = new HashSet<String>();

        @Override
        public void receiveMessage(AgentID sender, Action action) {
                this.lastReceivedAction = action;

                String utilSpaceName = utilitySpace.getFileName();

                if (!runBefore.contains(utilSpaceName)) {
                        if (data.get() != null) {
                                throw new IllegalStateException("Not run before but having data!");
                        }
                        data.put(DATA);
                        runBefore.add(utilSpaceName);
                } else {
                        if (!DATA.equals(data.get())) {
                                throw new IllegalStateException("Data has not been retained!");
                        }
                }

        }

        @Override
        public HashMap<String, String> negotiationEnded(Bid acceptedBid) {
                // we actually got here. Report it.
                super.negotiationEnded(acceptedBid);

                return null;
        }

}