HistoryTree.java

package org.maltparser.parser.history;

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

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

    private HistoryTreeNode root;
    protected final ObjectPoolList<HistoryNode> nodePool;

    public HistoryTree() {
        super();
        nodePool = new ObjectPoolList<HistoryNode>() {

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

            public void resetObject(HistoryNode o) throws MaltChainedException {
                o.clear();
            }
        };
        root = new HistoryTreeNode(null, null);
    }

    public HistoryNode getNewHistoryNode(HistoryNode previousNode, GuideUserAction action) throws MaltChainedException {
        HistoryNode node = nodePool.checkOut();
        node.setAction(action);
        if (previousNode == null) {
            node.setPreviousNode(root);
        } else {
            node.setPreviousNode(previousNode);
        }
        return node;
    }

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

    public void toFile() throws MaltChainedException {
    }

    public void close() throws MaltChainedException {
    }

    @Override
    public String toString() {
        final StringBuilder sb = new StringBuilder();
        sb.append(root.toString());
        return sb.toString();
    }
}