/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.isis.objectstore.jdo.service;
import java.util.Map;
import java.util.Set;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.jdo.annotations.PersistenceCapable;
import com.google.common.base.Predicate;
import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.Iterables;
import org.reflections.Reflections;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.isis.applib.annotation.Hidden;
import org.apache.isis.core.metamodel.spec.SpecificationLoaderSpi;
import org.apache.isis.core.runtime.system.context.IsisContext;
@Hidden
public class RegisterEntities {
@SuppressWarnings("unused")
private final static Logger LOG = LoggerFactory.getLogger(RegisterEntities.class);
private static final String LOCAL_KEY = "datanucleus.RegisterEntities.packagePrefix";
private final static String QUALIFIED_KEY = "isis.persistor." + LOCAL_KEY;
private String packagePrefixes;
@PostConstruct
public void init(Map<String,String> configuration) {
packagePrefixes = configuration.get(QUALIFIED_KEY);
if(Strings.isNullOrEmpty(packagePrefixes)) {
throw new IllegalStateException("Could not locate '" + QUALIFIED_KEY + "' key in property files - aborting");
}
registerAllPersistenceCapables();
}
@PreDestroy
public void shutdown() {
}
private void registerAllPersistenceCapables() {
for (final String packagePrefix : Splitter.on(",").split(packagePrefixes)) {
Reflections reflections = new Reflections(packagePrefix);
Set<Class<?>> entityTypes =
reflections.getTypesAnnotatedWith(PersistenceCapable.class);
if(noEntitiesIn(entityTypes)) {
throw new IllegalStateException("Could not locate any @PersistenceCapable entities in package " + packagePrefix);
}
for (Class<?> entityType : entityTypes) {
getSpecificationLoader().loadSpecification(entityType);
}
}
}
/**
* {@link Reflections} seems to return a set with 1 null element if none can be found.
*/
private static boolean noEntitiesIn(Set<Class<?>> entityTypes) {
return Iterables.filter(entityTypes, nullClass()).iterator().hasNext();
}
private static Predicate<Class<?>> nullClass() {
return new Predicate<Class<?>>() {
@Override
public boolean apply(Class<?> input) {
return input == null;
}
};
}
// //////////////////////////////////////
SpecificationLoaderSpi getSpecificationLoader() {
return IsisContext.getSpecificationLoader();
}
}