org.mycore.common.content.transformer.MCRContentTransformerFactory Maven / Gradle / Ivy
/*
* This file is part of *** M y C o R e ***
* See http://www.mycore.de/ for details.
*
* MyCoRe 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, either version 3 of the License, or
* (at your option) any later version.
*
* MyCoRe 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 MyCoRe. If not, see .
*/
package org.mycore.common.content.transformer;
import java.util.HashMap;
import org.mycore.common.config.MCRConfiguration2;
/**
* Creates and returns MCRContentTransformer instances by their ID.
*
* @author Frank L\u00FCtzenkirchen
*/
public class MCRContentTransformerFactory {
/** Map of transformer instances by ID */
private static HashMap transformers = new HashMap<>();
/**
* Returns the transformer with the given ID. If the transformer is not instantiated yet,
* it is created and initialized.
*/
public static MCRContentTransformer getTransformer(String id) {
if (transformers.containsKey(id)) {
return transformers.get(id);
} else {
return buildTransformer(id);
}
}
/**
* Creates and initializes the transformer with the given ID.
*/
private static synchronized MCRContentTransformer buildTransformer(String id) {
String property = "MCR.ContentTransformer." + id + ".Class";
if (MCRConfiguration2.getString(property).isEmpty()
&& MCRConfiguration2.getString("MCR.ContentTransformer." + id + ".Stylesheet").isEmpty()) {
//check for reasonable default:
return null;
}
MCRContentTransformer transformer = MCRConfiguration2.getInstanceOf(property)
.orElseGet(MCRXSLTransformer::new);
transformer.init(id);
transformers.put(id, transformer);
return transformer;
}
}