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package com.republicate.stillness;

import java.util.Hashtable;
import java.util.Enumeration;
import java.util.ArrayList;

import org.apache.velocity.context.Context;
import org.apache.velocity.VelocityContext;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Created by IntelliJ IDEA.
 * User: Demo
 * Date: 20 oct. 2006
 * Time: 10:35:38
 * To change this template use File | Settings | File Templates.
 */
public class WrappedContext implements Context {

    protected static Logger logger = LoggerFactory.getLogger("stillness");
    
    protected Context _savedContext = null; // original context whithout any modification
    protected Context _wrappedContext = null; // Context used for put/get methods call

    protected Hashtable _localData = new Hashtable(); // used in macro to store parameters (avoid name conflict on reference name)
    protected ArrayList _removedList = new ArrayList(); // list of removed elements to be removed from _savedContext on next commit

    public WrappedContext(Context c) {
        _savedContext = c;
        _wrappedContext = new VelocityContext();
        saveContext(_savedContext, _wrappedContext);
    }

    // commit modification from the _wrappedContext to the _savedContext
    public void commitChange() {
        saveContext(_wrappedContext, _savedContext);
    }

    protected void saveContext(Context src, Context dest) {
        while(_removedList.size()!=0)
            dest.remove((String)_removedList.remove(0));

        Object[] listKeys = src.getKeys();
        for (int i=0;i '"+ _savedContext.get(""+sctxt[i]) +"'");
        }
        logger.debug("_wrappedContext contains :");
        Object []wctxt = _wrappedContext.getKeys();
        for (int i=0; i '"+ _wrappedContext.get(""+wctxt[i]) +"'");
        }
        logger.debug("_localData contains :");
        for (Enumeration e = _localData.keys(); e.hasMoreElements();) {
            Object key = e.nextElement();
            logger.debug(key + " -> '"+ _localData.get(key) +"'");
        }
    }
}