/*
* 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.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.jdo.annotations.PersistenceCapable;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
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 com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.reflections.Reflections;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.isis.applib.AppManifest;
import org.apache.isis.core.metamodel.specloader.SpecificationLoader;
public class RegisterEntities {
@SuppressWarnings("unused")
private final static Logger LOG = LoggerFactory.getLogger(RegisterEntities.class);
public final static String PACKAGE_PREFIX_KEY = "isis.persistor.datanucleus.RegisterEntities.packagePrefix";
// //////////////////////////////////////
//region > entityTypes
private final Set<String> entityTypes = Sets.newLinkedHashSet();
private final SpecificationLoader specificationLoader;
public Set<String> getEntityTypes() {
return entityTypes;
}
//endregion
public RegisterEntities(final Map<String, String> configuration, final SpecificationLoader specificationLoader) {
this.specificationLoader = specificationLoader;
Set<Class<?>> persistenceCapableTypes = AppManifest.Registry.instance().getPersistenceCapableTypes();
if(persistenceCapableTypes == null) {
persistenceCapableTypes = searchForPersistenceCapables(configuration);
}
final List<String> classNamesNotEnhanced = Lists.newArrayList();
for (Class<?> persistenceCapableType : persistenceCapableTypes) {
if(ignore(persistenceCapableType)) {
continue;
}
if(!org.datanucleus.enhancement.Persistable.class.isAssignableFrom(persistenceCapableType)) {
classNamesNotEnhanced.add(persistenceCapableType.getCanonicalName());
}
this.entityTypes.add(persistenceCapableType.getCanonicalName());
}
if(!classNamesNotEnhanced.isEmpty()) {
final String classNamesNotEnhancedStr = Joiner.on("\n* ").join(classNamesNotEnhanced);
throw new IllegalStateException("Non-enhanced @PersistenceCapable classes found, will abort. The classes in error are:\n\n* " + classNamesNotEnhancedStr + "\n\nDid the DataNucleus enhancer run correctly?\n");
}
}
/**
* only called if no appManifest
*/
Set<Class<?>> searchForPersistenceCapables(final Map<String, String> configuration) {
final String packagePrefixes = lookupPackagePrefixes(configuration);
final Set<Class<?>> persistenceCapableTypes = Sets.newLinkedHashSet();
final List<String> domPackages = parseDomPackages(packagePrefixes);
for (final String packageName : domPackages) {
Reflections reflections = new Reflections(packageName);
final Set<Class<?>> entityTypesInPackage =
reflections.getTypesAnnotatedWith(PersistenceCapable.class);
if(!entitiesIn(entityTypesInPackage)) {
throw new IllegalArgumentException(String.format(
"Bad configuration.\n\nCould not locate any @PersistenceCapable entities in package '%s'\n" +
"Check value of '%s' key in WEB-INF/*.properties\n",
packageName,
PACKAGE_PREFIX_KEY));
}
persistenceCapableTypes.addAll(entityTypesInPackage);
}
return persistenceCapableTypes;
}
private String lookupPackagePrefixes(final Map<String, String> configuration) {
final String packagePrefixes = configuration.get(PACKAGE_PREFIX_KEY);
if(Strings.isNullOrEmpty(packagePrefixes)) {
throw new IllegalArgumentException(String.format(
"Could not locate '%s' key in property files - aborting",
PACKAGE_PREFIX_KEY));
}
return packagePrefixes;
}
private static List<String> parseDomPackages(String packagePrefixes) {
return Collections.unmodifiableList(Lists.newArrayList(Iterables.transform(Splitter.on(",").split(packagePrefixes), trim())));
}
private static boolean ignore(final Class<?> entityType) {
try {
if(entityType.isAnonymousClass() || entityType.isLocalClass() || entityType.isMemberClass()) {
return true;
}
final PersistenceCapable persistenceCapable = entityType.getAnnotation(PersistenceCapable.class);
return persistenceCapable == null; // ignore if doesn't have @PersistenceCapable
} catch (NoClassDefFoundError ex) {
return true;
}
}
private static Function<String,String> trim() {
return new Function<String,String>(){
@Override
public String apply(String input) {
return input.trim();
}
};
}
private static boolean entitiesIn(Set<Class<?>> entityTypes) {
return Iterables.filter(entityTypes, notNullClass()).iterator().hasNext();
}
/**
* {@link Reflections} seems to return a set with 1 null element if none can be found, so we ignore these.
*/
private static <T> Predicate<T> notNullClass() {
return new Predicate<T>() {
@Override
public boolean apply(T input) {
return input != null;
}
};
}
// //////////////////////////////////////
SpecificationLoader getSpecificationLoader() {
return specificationLoader;
}
}