/*
* Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron,
* Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
*
* THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS.
* WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND
* NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
* FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE
* IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR
* CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.
* NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
* DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
* OR MODIFICATIONS.
* THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION,
* USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS
* PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY
* AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
*/
package org.csstudio.sds.internal.persistence;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Descriptor for extensions of the <code>propertyPersistenceHandlers</code>
* extension point.
*
* @author Alexander Will
* @version $Revision: 1.1 $
*
*/
public final class PropertyPersistenceHandlerDescriptor {
private static final Logger LOG = LoggerFactory.getLogger(PropertyPersistenceHandlerDescriptor.class);
/**
* Reference to a configuration element of the Eclipse plugin registry.
*/
private IConfigurationElement _configurationElement;
/**
* A lazy instantiated property persistence handler.
*/
private AbstractPropertyPersistenceHandler _persistenceHandler;
/**
* Constructs a descriptor, which is based on the specified configuration
* element.
*
* @param configurationElement
* the configuration element
*/
public PropertyPersistenceHandlerDescriptor(
final IConfigurationElement configurationElement) {
_configurationElement = configurationElement;
}
/**
* Instantiate and return the persistence handler.
*
* @return The property persistence handler.
*/
public AbstractPropertyPersistenceHandler getPersistenceHandler() {
if (_persistenceHandler == null) {
try {
_persistenceHandler = (AbstractPropertyPersistenceHandler) _configurationElement
.createExecutableExtension("class"); //$NON-NLS-1$
} catch (CoreException e) {
LOG.error(e.toString());
}
}
return _persistenceHandler;
}
}