/*
* (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
*
* 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.
*
* Contributors:
* Florent Guillaume
*/
package org.nuxeo.ecm.core.storage.sql.jdbc;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.nuxeo.ecm.core.query.sql.NXQL;
import org.nuxeo.runtime.model.ComponentInstance;
import org.nuxeo.runtime.model.DefaultComponent;
/**
* Service for the registration of QueryMaker classes.
*/
public class QueryMakerServiceImpl extends DefaultComponent implements QueryMakerService {
private static final Log log = LogFactory.getLog(QueryMakerServiceImpl.class);
public static final String XP = "queryMaker";
protected final List<QueryMakerDescriptor> descriptors = new ArrayList<QueryMakerDescriptor>(2);
protected List<Class<? extends QueryMaker>> queryMakers;
@Override
public void registerContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
if (XP.equals(extensionPoint)) {
registerQueryMaker((QueryMakerDescriptor) contribution);
}
}
@Override
public void unregisterContribution(Object contribution, String extensionPoint, ComponentInstance contributor) {
if (XP.equals(extensionPoint)) {
unregisterQueryMaker((QueryMakerDescriptor) contribution);
}
}
@Override
public void registerQueryMaker(QueryMakerDescriptor descriptor) {
if (descriptor.enabled) {
log.info(String.format("Registering QueryMaker '%s': %s", descriptor.name, descriptor.queryMaker.getName()));
} else {
log.info(String.format("Disabling QueryMaker '%s'", descriptor.name));
}
descriptors.add(descriptor);
queryMakers = null;
}
@Override
public void unregisterQueryMaker(QueryMakerDescriptor descriptor) {
if (descriptor.enabled) {
log.info(String.format("Unregistering QueryMaker '%s': %s", descriptor.name,
descriptor.queryMaker.getName()));
} else {
log.info(String.format("Unregistering disabled QueryMaker '%s'", descriptor.name));
}
descriptors.remove(descriptor);
queryMakers = null;
}
@Override
public synchronized List<Class<? extends QueryMaker>> getQueryMakers() {
if (queryMakers == null) {
// recompute queryMakers
queryMakers = new ArrayList<Class<? extends QueryMaker>>(2);
List<QueryMakerDescriptor> qmdl = new ArrayList<QueryMakerDescriptor>(descriptors);
Collections.reverse(qmdl);
Set<String> done = new HashSet<String>();
for (QueryMakerDescriptor descriptor : qmdl) {
if (!done.add(descriptor.name)) {
continue;
}
if (descriptor.enabled) {
queryMakers.add(descriptor.queryMaker);
}
}
Collections.reverse(queryMakers);
// BBB backward compat
if (queryMakers.isEmpty() && !done.contains(NXQL.NXQL)) {
queryMakers.add(NXQLQueryMaker.class);
}
}
return queryMakers;
}
}