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DefaultFilter.java
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DefaultFilter.java
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/**
* Copyright 2013 DuraSpace, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.fcrepo.kernel.observer;
import static com.google.common.base.Throwables.propagate;
import static javax.jcr.observation.Event.NODE_ADDED;
import static javax.jcr.observation.Event.NODE_MOVED;
import static javax.jcr.observation.Event.NODE_REMOVED;
import static javax.jcr.observation.Event.PROPERTY_ADDED;
import static javax.jcr.observation.Event.PROPERTY_CHANGED;
import static javax.jcr.observation.Event.PROPERTY_REMOVED;
import static org.fcrepo.kernel.utils.FedoraTypesUtils.isFedoraObjectOrDatastream;
import javax.inject.Inject;
import javax.jcr.Node;
import javax.jcr.PathNotFoundException;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.observation.Event;
import org.modeshape.jcr.api.Repository;
/**
* EventFilter that passes only events emitted from nodes with
* a Fedora JCR type, or properties attached to them.
*
* @author eddies
* @date Feb 7, 2013
*
* @author escowles
* @date Oct 3, 2013
*/
public class DefaultFilter implements EventFilter {
@Inject
private Repository repository;
/**
* Filter observer events to only include events on a FedoraObject or
* Datastream, or properties of an FedoraObject or Datastream.
*
* @param event the original event
* @return
*/
@Override
public boolean apply(final Event event) {
Session session = null;
try {
String nPath = event.getPath();
int nType = event.getType();
switch(nType) {
case NODE_ADDED:
break;
case NODE_REMOVED:
return true;
case PROPERTY_ADDED:
nPath = nPath.substring(0, nPath.lastIndexOf('/'));
break;
case PROPERTY_REMOVED:
nPath = nPath.substring(0, nPath.lastIndexOf('/'));
break;
case PROPERTY_CHANGED:
nPath = nPath.substring(0, nPath.lastIndexOf('/'));
break;
case NODE_MOVED:
break;
default:
return false;
}
session = repository.login();
final Node n = session.getNode(nPath);
return isFedoraObjectOrDatastream.apply(n);
} catch (final PathNotFoundException e) {
// not a node in the fedora workspace
return false;
} catch (final RepositoryException e) {
throw propagate(e);
} finally {
if (session != null) {
session.logout();
}
}
}
}