org.mycore.frontend.jersey.filter.access.MCRResourceAccessCheckerFactory 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.frontend.jersey.filter.access;
import java.util.concurrent.ConcurrentHashMap;
/**
* @author Thomas Scheffler (yagee)
*
*/
public class MCRResourceAccessCheckerFactory {
private static ConcurrentHashMap, MCRResourceAccessChecker> implMap;
static {
//static block as code style requires 120 character line width
implMap = new ConcurrentHashMap<>();
}
public static T getInstance(Class clazz)
throws ReflectiveOperationException {
@SuppressWarnings("unchecked")
T accessChecker = (T) implMap.get(clazz);
if (accessChecker != null) {
return accessChecker;
}
accessChecker = clazz.getDeclaredConstructor().newInstance();
implMap.put(clazz, accessChecker);
return accessChecker;
}
}