/*
 *  eXist Apache FOP Transformation Extension
 *  Copyright (C) 2007 Craig Goodyer at the University of the West of England
 *  
 *  This program 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 2
 *  of the License, or (at your option) any later version.
 *  
 *  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 Lesser General Public License for more details.
 *  
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *  
 *  $Id$
 */

package org.exist.xquery.modules.xslfo;

import java.util.List;
import java.util.Map;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;
import org.exist.xquery.AbstractInternalModule;
import org.exist.xquery.FunctionDef;

/**
 * @author Craig Goodyer <craiggoodyer@gmail.com>
 * @author Adam Retter <adam.retter@devon.gov.uk>
 * @author ljo
 */
public class XSLFOModule extends AbstractInternalModule {

    private static final Logger logger = LogManager.getLogger(XSLFOModule.class);

    public final static String NAMESPACE_URI = "http://exist-db.org/xquery/xslfo";
    public final static String PREFIX = "xslfo";
    public final static String INCLUSION_DATE = "2007-10-04";
    public final static String RELEASED_IN_VERSION = "eXist-1.2";

    private final static FunctionDef[] functions = {
        new FunctionDef(RenderFunction.signatures[0], RenderFunction.class),
        new FunctionDef(RenderFunction.signatures[1], RenderFunction.class)
    };

    public XSLFOModule(Map<String, List<? extends Object>> parameters) {
        super(functions, parameters);
    }

    @Override
    public String getNamespaceURI() {
        return NAMESPACE_URI;
    }

    @Override
    public String getDefaultPrefix() {
        return PREFIX;
    }

    @Override
    public String getDescription() {
        return "A module for performing XSL-FO transformations";
    }

    @Override
    public String getReleaseVersion() {
        return RELEASED_IN_VERSION;
    }

    private ProcessorAdapter adapter = null;
    
    public synchronized ProcessorAdapter getProcessorAdapter() {
       
        if(adapter == null) {
            List<String> processorAdapterParamList = (List<String>)getParameter("processorAdapter");
            if(!processorAdapterParamList.isEmpty()) {
                String processorAdapter = processorAdapterParamList.get(0);

                try {
                    Class<ProcessorAdapter> clazzAdapter = (Class<ProcessorAdapter>)Class.forName(processorAdapter);
                    adapter = clazzAdapter.newInstance();
                } catch (ClassNotFoundException cnfe) {
                    logger.error("Unable to instantiate FO Processor Adapter:" + cnfe.getMessage(), cnfe);
                } catch(InstantiationException ie) {
                    logger.error("Unable to instantiate FO Processor Adapter:" + ie.getMessage(), ie);
                } catch(IllegalAccessException iae) {
                    logger.error("Unable to instantiate FO Processor Adapter:" + iae.getMessage(), iae);
                }
            }
        }
        return adapter;
    }
}