/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.envers.tools;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import javassist.util.proxy.ProxyFactory;
import org.hibernate.Session;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.proxy.HibernateProxy;
/**
* @author Adam Warski (adam at warski dot org)
* @author Hern�n Chanfreau
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
*/
public class Tools {
public static <K,V> Map<K,V> newHashMap() {
return new HashMap<K,V>();
}
public static <E> Set<E> newHashSet() {
return new HashSet<E>();
}
public static <K,V> Map<K,V> newLinkedHashMap() {
return new LinkedHashMap<K,V>();
}
public static boolean entitiesEqual(SessionImplementor session, String entityName, Object obj1, Object obj2) {
Object id1 = getIdentifier(session, entityName, obj1);
Object id2 = getIdentifier(session, entityName, obj2);
return objectsEqual(id1, id2);
}
public static Object getIdentifier(SessionImplementor session, String entityName, Object obj) {
if (obj == null) {
return null;
}
if (obj instanceof HibernateProxy) {
HibernateProxy hibernateProxy = (HibernateProxy) obj;
return hibernateProxy.getHibernateLazyInitializer().getIdentifier();
}
return session.getEntityPersister(entityName, obj).getIdentifier(obj, session);
}
public static Object getTargetFromProxy(SessionFactoryImplementor sessionFactoryImplementor, HibernateProxy proxy) {
if (!proxy.getHibernateLazyInitializer().isUninitialized()) {
return proxy.getHibernateLazyInitializer().getImplementation();
}
SessionImplementor sessionImplementor = proxy.getHibernateLazyInitializer().getSession();
Session tempSession = sessionImplementor==null
? sessionFactoryImplementor.openTemporarySession()
: sessionImplementor.getFactory().openTemporarySession();
try {
Object target = tempSession.get(
proxy.getHibernateLazyInitializer().getEntityName(),
proxy.getHibernateLazyInitializer().getIdentifier()
);
return target;
}
finally {
tempSession.close();
}
}
/**
* @param clazz Class wrapped with a proxy or not.
* @param <T> Class type.
* @return Returns target class in case it has been wrapped with a proxy. If {@code null} reference is passed,
* method returns {@code null}.
*/
@SuppressWarnings({"unchecked"})
public static <T> Class<T> getTargetClassIfProxied(Class<T> clazz) {
if (clazz == null) {
return null;
} else if (ProxyFactory.isProxyClass(clazz)) {
// Get the source class of Javassist proxy instance.
return (Class<T>) clazz.getSuperclass();
}
return clazz;
}
public static boolean objectsEqual(Object obj1, Object obj2) {
if (obj1 == null) {
return obj2 == null;
}
return obj1.equals(obj2);
}
public static <T> List<T> iteratorToList(Iterator<T> iter) {
List<T> ret = new ArrayList<T>();
while (iter.hasNext()) {
ret.add(iter.next());
}
return ret;
}
public static boolean iteratorsContentEqual(Iterator iter1, Iterator iter2) {
while (iter1.hasNext() && iter2.hasNext()) {
if (!iter1.next().equals(iter2.next())) {
return false;
}
}
//noinspection RedundantIfStatement
if (iter1.hasNext() || iter2.hasNext()) {
return false;
}
return true;
}
/**
* Transforms a list of arbitrary elements to a list of index-element pairs.
* @param list List to transform.
* @return A list of pairs: ((0, element_at_index_0), (1, element_at_index_1), ...)
*/
public static <T> List<Pair<Integer, T>> listToIndexElementPairList(List<T> list) {
List<Pair<Integer, T>> ret = new ArrayList<Pair<Integer, T>>();
Iterator<T> listIter = list.iterator();
for (int i=0; i<list.size(); i++) {
ret.add(Pair.make(i, listIter.next()));
}
return ret;
}
/**
* @param properties Properties from which to read.
* @param propertyName The name of the property.
* @param legacyPropertyName Legacy name of the property. The value of this property is read if value for
* {@code propertyName} is not set.
* @param defaultValue Default value returned if a value neither for {@code propertyName} or
* {@code legacyPropertyName} is set.
* @return The value of the property, legacy proparty or the default value, if neither of the values are not set.
*/
public static String getProperty(Properties properties, String propertyName, String legacyPropertyName, String defaultValue) {
String value = properties.getProperty(propertyName, null);
if (value == null) {
return properties.getProperty(legacyPropertyName, defaultValue);
} else {
return value;
}
}
/**
* @return Java class mapped to specified entity name.
*/
public static Class getEntityClass(SessionImplementor sessionImplementor, Session session, String entityName) {
EntityPersister entityPersister = sessionImplementor.getFactory().getEntityPersister(entityName);
return entityPersister.getMappedClass();
}
}