/**
 * Copyright 2008-2009 DRIVER PROJECT (Bielefeld University)
 * Original author: Marek Horst (ICM UW)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package eu.dnetlib.common.profile.blackboard;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import eu.dnetlib.common.interfaces.nh.IBlackboardMessage;


/**
 * Blackboard model representation.
 * @author Marek Horst
 * @version 0.0.1 
 *
 */
public class Blackboard {

	private BlackboardLastAction lastRequest;
	private BlackboardLastAction lastResponse;
	private List<IBlackboardMessage> messages = new ArrayList<IBlackboardMessage>();
	
	public BlackboardLastAction getLastRequest() {
		return lastRequest;
	}
	public void setLastRequest(BlackboardLastAction lastRequest) {
		this.lastRequest = lastRequest;
	}
	public BlackboardLastAction getLastResponse() {
		return lastResponse;
	}
	public void setLastResponse(BlackboardLastAction lastResponse) {
		this.lastResponse = lastResponse;
	}
	public List<IBlackboardMessage> getMessages() {
		return messages;
	}
	public void setMessages(List<IBlackboardMessage> messages) {
		this.messages = messages;
	}

	/**
	 * Adds single message to the messages.
	 * @param message
	 */
	public void addMessage(Message message) {
		if (message==null)
			return;
		if (messages!=null) {
			messages.add(message);
			return;
		} else {
			messages = new ArrayList<IBlackboardMessage>();
			messages.add(message);
			return;
		}
			
	}
	
	/**
	 * Return message for the last request.
	 * @return message for the last request
	 */
	public IBlackboardMessage getMessageForLastRequest() {
		if (lastRequest==null || lastRequest.getValue()==null
				|| messages ==null)
			return null;
		Iterator<IBlackboardMessage> it = messages.iterator();
		while (it.hasNext()) {
			IBlackboardMessage currentMessage = it.next();
			if (currentMessage.getId()!=null &&
					currentMessage.getId().equals(lastRequest.getValue()))
				return currentMessage;
		}
		return null;
	}
	
}