package org.maltparser.parser.history;

import java.util.ArrayList;
import org.maltparser.core.exception.MaltChainedException;
import org.maltparser.core.pool.ObjectPoolList;
import org.maltparser.parser.history.action.GuideUserAction;

/**
 *
 * @author Johan Hall
 */
public class HistoryList extends HistoryStructure {

    protected final ArrayList<HistoryNode> list;
    protected final ObjectPoolList<HistoryNode> nodePool;
//	protected BufferedWriter writer;

    public HistoryList() throws MaltChainedException {
        super();
        list = new ArrayList<HistoryNode>();
        nodePool = new ObjectPoolList<HistoryNode>() {

            protected HistoryNode create() throws MaltChainedException {
                return new HistoryListNode(null, null);
            }

            public void resetObject(HistoryNode o) throws MaltChainedException {
                o.clear();
            }
        };
//		try {
//			writer = new BufferedWriter(new FileWriter("tseq.dat"));
//		} catch (IOException e) {
//			throw new MaltChainedException("", e);
//		}
    }

    public HistoryNode getNewHistoryNode(HistoryNode previousNode, GuideUserAction action) throws MaltChainedException {
        HistoryNode node = nodePool.checkOut();
        node.setAction(action);
        node.setPreviousNode(previousNode);
        list.add(node);
        return node;
    }

    public void clear() throws MaltChainedException {
        nodePool.checkInAll();
        list.clear();
    }

    @Override
    public boolean equals(Object obj) {
        return super.equals(obj);
    }

    @Override
    public int hashCode() {
        return super.hashCode();
    }

    public void toFile() throws MaltChainedException {
//		try {
//			for (int i = 0; i < list.size(); i++) {
//				writer.write(((ComplexDecisionAction)list.get(i).getAction()).getSingleDecision(0).getDecisionSymbol());
//				writer.write("\n");
//				writer.flush();
//			}
//			writer.write("\n");
//		} catch (IOException e) {
//			throw new MaltChainedException("", e);
//		}
    }

    public void close() throws MaltChainedException {
//		if (writer != null) {
//			try {
//				writer.flush();
//				writer.close();
//				writer = null;
//			} catch (IOException e) {
//				throw new MaltChainedException("", e);
//			}
//		}
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            sb.append(list.get(i));
            if (i < list.size() - 1) {
                sb.append(", ");
            }
        }
        return sb.toString();
    }
}