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/**
 *
 * Copyright (c) 2009-2014 Freedomotic team
 * http://freedomotic.com
 *
 * This file is part of Freedomotic
 *
 * This Program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This Program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Freedomotic; see the file COPYING.  If not, see
 * .
 */
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package com.freedomotic.persistence;

import com.freedomotic.model.ds.Tuples;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.logging.Logger;

/**
 *
 * @author Enrico
 */
class TupleConverter implements Converter {

    /**
     *
     * @param o
     * @param writer
     * @param mc
     */
    @Override
    public void marshal(Object o, HierarchicalStreamWriter writer, MarshallingContext mc) {
        Tuples t = (Tuples) o;

        for (int i = 0; i < t.size(); i++) {
            HashMap properties = t.getTuple(i);
            Set> entrySet = properties.entrySet();
            writer.startNode("tuple");
            for (Map.Entry entry : entrySet) {
                writer.startNode("property");
                // TODO unnecessary explicit .toString() invocation
                writer.addAttribute("name", entry.getKey().toString());
                writer.addAttribute("value", entry.getValue().toString());
                writer.endNode();
            }

            writer.endNode();
        }
    }

    /**
     *
     * @param reader
     * @param uc
     * @return
     */
    @Override
    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext uc) {
        Tuples t = new Tuples();

        //starts from root 
        while (reader.hasMoreChildren()) {
            reader.moveDown(); //goes down to 
            HashMap map = new HashMap();
            //reads properties on the same level
            while (reader.hasMoreChildren()) {
                reader.moveDown();
                map.put(reader.getAttribute("name"),
                        reader.getAttribute("value"));
                reader.moveUp();
            }

            t.add(map);
            reader.moveUp(); //goes up to the next 
        }

        return t;
    }

    /**
     *
     * @param clazz
     * @return
     */
    @Override
    public boolean canConvert(Class clazz) {
        return clazz.equals(Tuples.class);
    }
    private static final Logger LOG = Logger.getLogger(TupleConverter.class.getName());
}