/*
 * Copyright (C) 2005-2013 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco 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.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */

package org.alfresco.repo.node.archive;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.alfresco.query.CannedQueryParameters;
import org.alfresco.repo.domain.node.NodeDAO;
import org.alfresco.repo.domain.query.CannedQueryDAO;
import org.alfresco.repo.security.permissions.impl.acegi.AbstractCannedQueryPermissions;
import org.alfresco.repo.security.permissions.impl.acegi.MethodSecurityBean;
import org.alfresco.service.cmr.repository.NodeRef;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Canned query for archived nodes.
 * 
 * @author Jamal Kaabi-Mofrad
 * @since 4.2
 */
public class GetArchivedNodesCannedQuery extends AbstractCannedQueryPermissions<ArchivedNodeEntity>
{
    private Log logger = LogFactory.getLog(GetArchivedNodesCannedQuery.class);

    private static final String QUERY_NAMESPACE = "alfresco.query.archivednodes";
    private static final String QUERY_SELECT_GET_ARCHIVED_NODES = "select_GetArchivedNodesCannedQuery";

    private CannedQueryDAO cannedQueryDAO;
    private NodeDAO nodeDAO;

    public GetArchivedNodesCannedQuery(CannedQueryDAO cannedQueryDAO, NodeDAO nodeDAO,
                MethodSecurityBean<ArchivedNodeEntity> methodSecurity, CannedQueryParameters params)
    {
        super(params, methodSecurity);
        this.cannedQueryDAO = cannedQueryDAO;
        this.nodeDAO = nodeDAO;

    }

    @Override
    protected List<ArchivedNodeEntity> queryAndFilter(CannedQueryParameters parameters)
    {
        Long start = (logger.isDebugEnabled() ? System.currentTimeMillis() : null);

        Object paramBeanObj = parameters.getParameterBean();
        if (paramBeanObj == null)
            throw new NullPointerException("Null GetArchivedNodes query params");

        // Get parameters
        GetArchivedNodesCannedQueryParams paramBean = (GetArchivedNodesCannedQueryParams) paramBeanObj;
        
        if (paramBean.getParentNodeId() == null || paramBean.getParentNodeId() < 0)
        {
            return Collections.emptyList();
        }

        int resultsRequired = parameters.getResultsRequired();
        paramBean.setLimit(resultsRequired);

        // note: refer to SQL for specific DB filtering and sorting
        List<ArchivedNodeEntity> results = cannedQueryDAO.executeQuery(QUERY_NAMESPACE,
                    QUERY_SELECT_GET_ARCHIVED_NODES, paramBean, 0, Integer.MAX_VALUE);

        List<NodeRef> nodeRefs = new ArrayList<NodeRef>(results.size());
        for (ArchivedNodeEntity entity : results)
        {
            nodeRefs.add(entity.getNodeRef());
        }

        // preload the node for later when we want to get the properties of the node
        preload(nodeRefs);

        if (start != null)
        {
            logger.debug("Base query: " + nodeRefs.size() + " in "
                        + (System.currentTimeMillis() - start) + " msecs");
        }

        return results;

    }

    private void preload(List<NodeRef> nodeRefs)
    {
        Long start = (logger.isTraceEnabled() ? System.currentTimeMillis() : null);

        nodeDAO.cacheNodes(nodeRefs);

        if (start != null)
        {
            logger.trace("Pre-load: " + nodeRefs.size() + " in "
                        + (System.currentTimeMillis() - start) + " msecs");
        }
    }
}