package com.c2kernel.lifecycle.routingHelpers;

import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.proxy.ItemProxy;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.outcome.Outcome;
import com.c2kernel.persistency.outcome.Viewpoint;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.XmlElementParser;

public class ViewpointDataHelper
{
    static Object[] errArr = { "" };
    /**
     * Method get.
     * @param value
     * @return String[]
     * @throws Exception
     */
    /**@param value : /UUID (or . if current) /SchemaName/Viewname/Path:XPathInOutcome */
    public static Object [] get(String value) throws Exception
    {
        //Syntax of search : <EntityPath>/<ViewpointPath>:<XPathinOutcome>
        String entityPath;
        String viewpoint;
        String xpath;
        Object[] retArr;

        // find syskey, viewname, xpath
        int firstSlash = value.indexOf("/");
        if (firstSlash > 0) {
            entityPath = value.substring(0, firstSlash);
            int startXPath = value.indexOf(":");
            if (startXPath==-1) {
                viewpoint = value.substring(firstSlash + 1);
                xpath = null;
            } else {
                viewpoint = value.substring(firstSlash + 1, startXPath);
                xpath = value.substring(startXPath+1);
            }
        }
        else return errArr;

        // find entity
        ItemPath sourcePath;
        try
        {
            sourcePath = ItemPath.fromUUIDString(entityPath);
        } catch (Exception e) {
            sourcePath = new ItemPath(entityPath);
        }

        try {
            // load viewpoint
            ItemProxy dataSource = Gateway.getProxyManager().getProxy(sourcePath);
            Viewpoint view = (Viewpoint)dataSource.getObject(ClusterStorage.VIEWPOINT + "/" + viewpoint);
            Outcome outcome = view.getOutcome();
            if (xpath == null) {
                retArr = new Object[1];
                retArr[0] = outcome;
            }
            else
                retArr = XmlElementParser.parse(outcome.getData(), xpath);
            return retArr;

        } catch (ObjectNotFoundException e) {
            return errArr;
        }
    }
}