// --- BEGIN COPYRIGHT BLOCK ---
// 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; version 2 of the License.
//
// 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 this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.cmscore.dbs;

import java.util.Enumeration;

import netscape.ldap.LDAPEntry;
import netscape.ldap.LDAPException;

import com.netscape.certsrv.apps.CMS;
import com.netscape.certsrv.dbs.IDBRegistry;
import com.netscape.certsrv.dbs.IDBSearchResults;
import com.netscape.certsrv.logging.ILogger;

/**
 * A class represents the search results. A search
 * results object contain a enumeration of
 * Java objects that are just read from the database.
 *
 * @author thomask
 * @version $Revision$, $Date$
 */
public class DBSearchResults implements IDBSearchResults {

    private IDBRegistry mRegistry = null;
    private Enumeration<Object> mRes = null;
    private ILogger mLogger = CMS.getLogger();

    /**
     * Constructs search results.
     */
    public DBSearchResults(IDBRegistry registry, Enumeration<Object> res) {
        mRegistry = registry;
        mRes = res;
    }

    /**
     * Checks if any element is available.
     */
    public boolean hasMoreElements() {
        return mRes.hasMoreElements();
    }

    /**
     * Retrieves next element.
     */
    public Object nextElement() {
        LDAPEntry entry = null;

        try {
            Object o = mRes.nextElement();

            if (o instanceof LDAPEntry) {
                entry = (LDAPEntry) o;
                return mRegistry.createObject(entry.getAttributeSet());
            } else {
                if (o instanceof LDAPException)
                    ;
                // doing nothing because the last object in the search
                // results is always LDAPException
                else
                    mLogger.log(ILogger.EV_SYSTEM, ILogger.S_DB,
                            ILogger.LL_FAILURE, "DBSearchResults: result format error class=" + o.getClass().getName());
            }
        } catch (Exception e) {

            /*LogDoc
             *
             * @phase local ldap search
             * @reason failed to get next element
             * @message DBSearchResults: <exception thrown>
             */
            mLogger.log(ILogger.EV_SYSTEM, ILogger.S_DB,
                    ILogger.LL_FAILURE, "DBSearchResults: " + e.toString());
        }
        return null;
    }
}