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Cristal-ise is a description-driven software platform originally developed to track the construction of the CMS ECAL detector of the LHC at CERN. This is its core library, known as the kernel, which manages business objects called Items. Items are entirely configured from data, called descriptions, held in other Items. Every change of a state in an Item is a consequence of an execution of an activity in that Item's lifecycle, meaning that Cristal-ise applications are completely traceable, even in their design. It also supports extensive versioning of Item description data, giving the system a high level of flexibility.

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/**
 * This file is part of the CRISTAL-iSE kernel.
 * Copyright (c) 2001-2015 The CRISTAL Consortium. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 3 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * http://www.fsf.org/licensing/licenses/lgpl.html
 */
package org.cristalise.storage;
import java.util.HashMap;
import java.util.StringTokenizer;

import org.cristalise.kernel.common.ObjectNotFoundException;
import org.cristalise.kernel.common.PersistencyException;
import org.cristalise.kernel.entity.AgentHelper;
import org.cristalise.kernel.entity.C2KLocalObject;
import org.cristalise.kernel.entity.Item;
import org.cristalise.kernel.entity.ItemHelper;
import org.cristalise.kernel.lookup.ItemPath;
import org.cristalise.kernel.lookup.Lookup;
import org.cristalise.kernel.persistency.ClusterStorage;
import org.cristalise.kernel.persistency.ClusterType;
import org.cristalise.kernel.persistency.outcome.Outcome;
import org.cristalise.kernel.process.Gateway;
import org.cristalise.kernel.process.auth.Authenticator;
import org.cristalise.kernel.querying.Query;
import org.cristalise.kernel.utils.Logger;


/**
 * Used by proxies to load clusters by queryData from the Entity.
 * Last client storage - only used if not cached elsewhere
 */
public class ProxyLoader extends ClusterStorage {
    HashMap entities = new HashMap();
    Lookup lookup;

    @Override
    public void open(Authenticator auth) throws PersistencyException {
        lookup = Gateway.getLookup();
    }

    @Override
    public void postBoostrap() {
        //nothing to be done
    }

    @Override
    public void postStartServer() {
        //nothing to be done
    }

    @Override
    public void postConnect() {
        //nothing to be done
    }

    @Override
    public void close() throws PersistencyException {
    }

    @Override
    public boolean checkQuerySupport(String language) {
        Logger.warning("ProxyLoader DOES NOT Support any query");
        return false;
    }

    @Override
    public short queryClusterSupport(String clusterType) {
        return READ;
    }

    @Override
    public String getName() {
        return "Proxy Cluster Loader";
    }

    @Override
    public String getId() {
        return "CORBA";
    }

    @Override
    public String executeQuery(Query query) throws PersistencyException {
        throw new PersistencyException("UNIMPLEMENTED funnction");
    }

    /**
     * retrieve object by path
     */
    @Override
    public C2KLocalObject get(ItemPath thisItem, String path) throws PersistencyException {
        try {
            Item thisEntity = getIOR(thisItem);
            ClusterType type = getClusterType(path);

            // fetch the xml from the item
            String queryData = thisEntity.queryData(path);

            if (Logger.doLog(8)) Logger.msg("ProxyLoader.get() - "+thisItem+" : "+path+" = "+queryData);

            if (queryData != null) {
                if (type == ClusterType.OUTCOME) return new Outcome(path, queryData);
                else                             return (C2KLocalObject)Gateway.getMarshaller().unmarshall(queryData);
            }
        }
        catch (ObjectNotFoundException e) {
            return null;
        }
        catch (Exception e) {
            Logger.error(e);
            throw new PersistencyException(e.getMessage());
        }
        return null;
    }

    /**
     * store object not supported
     */
    @Override
    public void put(ItemPath thisItem, C2KLocalObject obj) throws PersistencyException {
        throw new PersistencyException("Cannot write to items through the ProxyLoader");
    }

    /**
     * delete cluster not supported
     */
    @Override
    public void delete(ItemPath thisItem, String path) throws PersistencyException {
        throw new PersistencyException("Cannot write to items through the ProxyLoader");
    }

    /**
     * Directory listing
     */
    @Override
    public String[] getClusterContents(ItemPath thisItem, String path) throws PersistencyException {
        try {
            Item thisEntity = getIOR(thisItem);
            String contents = thisEntity.queryData(path+"/all");
            StringTokenizer tok = new StringTokenizer(contents, ",");
            String[] result = new String[tok.countTokens()];

            for (int i=0; i