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PersistenceProviderResolverHolder.java
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PersistenceProviderResolverHolder.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
* <p>
* 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, either version 3 of the License, or (at your option) any later
* version.
* <p>
* 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, see
* <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.model;
/**
* Holds the global {@link PersistenceProviderResolver} instance.
* <p>
* If no {@code PersistenceProviderResolver} is set by the environment, the default {@code PersistenceProviderResolver}
* is used. Implementations must be thread-safe.
*/
public class PersistenceProviderResolverHolder {
private static PersistenceProviderResolver instance = new DefaultPersistenceProviderResolver();
private PersistenceProviderResolverHolder() {
throw new AssertionError();
}
/**
* Returns the current persistence provider resolver.
*
* @return the current persistence provider resolver
*/
public static synchronized PersistenceProviderResolver getPersistenceProviderResolver() {
return instance;
}
/**
* Defines the persistence provider resolver used.
*
* @param resolver persistence provider resolver to be used
*/
public static synchronized void setPersistenceProviderResolver(final PersistenceProviderResolver resolver) {
if (resolver == null) {
instance = new DefaultPersistenceProviderResolver();
} else {
instance = resolver;
}
}
}