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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.

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package aima.core.search.framework;

import java.util.Iterator;
import java.util.List;
import java.util.Properties;

import aima.core.agent.Action;
import aima.core.agent.Percept;
import aima.core.agent.impl.AbstractAgent;
import aima.core.agent.impl.NoOpAction;
import aima.core.search.framework.problem.Problem;

/**
 * @author Ravi Mohan
 * 
 */
public class SearchAgent extends AbstractAgent {
	protected List actionList;

	private Iterator actionIterator;

	private Metrics searchMetrics;

	public SearchAgent(Problem p, SearchForActions search) throws Exception {
		actionList = search.findActions(p);
		actionIterator = actionList.iterator();
		searchMetrics = search.getMetrics();
	}

	@Override
	public Action execute(Percept p) {
		if (actionIterator.hasNext()) {
			return actionIterator.next();
		} else {
			return NoOpAction.NO_OP;
		}
	}

	public boolean isDone() {
		return !actionIterator.hasNext();
	}

	public List getActions() {
		return actionList;
	}

	public Properties getInstrumentation() {
		Properties retVal = new Properties();
		Iterator iter = searchMetrics.keySet().iterator();
		while (iter.hasNext()) {
			String key = iter.next();
			String value = searchMetrics.get(key);
			retVal.setProperty(key, value);
		}
		return retVal;
	}
}