/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package javax.persistence;
import javax.persistence.spi.LoadState;
import javax.persistence.spi.PersistenceProvider;
import javax.persistence.spi.ProviderUtil;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.HashSet;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Bootstrap class to obtain an EntityManagerFactory.
*/
public class Persistence {
private static final Logger log
= Logger.getLogger(Persistence.class.getName());
private static final String SERVICE
= "META-INF/services/javax.persistence.spi.PersistenceProvider";
private static WeakHashMap<ClassLoader,String[]>
_providerMap = new WeakHashMap<ClassLoader,String[]>();
private static final String AMBER_PROVIDER
= "com.caucho.amber.manager.AmberPersistenceProvider";
@Deprecated
protected static final java.util.Set<PersistenceProvider> providers
= new HashSet<PersistenceProvider>();
@Deprecated
public static final String PERSISTENCE_PROVIDER
= "javax.persistence.spi.PeristenceProvider";
/**
* Create an return an EntityManagerFactory for the named unit.
*
* @param name - the name of the persistence unit
*/
public static EntityManagerFactory createEntityManagerFactory(String name)
{
for (PersistenceProvider provider: getProviderList()) {
EntityManagerFactory factory;
factory = provider.createEntityManagerFactory(name, null);
if (factory != null)
return factory;
}
throw new PersistenceException("no persistence provider found for `" + name + '\'');
}
/**
* Create and return an EntityManagerFactory for the named unit.
*
* @param name - the name of the persistence unit
* @param props - persistence unit properties
*/
@SuppressWarnings("unchecked")
public static EntityManagerFactory
createEntityManagerFactory(String name, Map props)
{
for (PersistenceProvider provider : getProviderList()) {
EntityManagerFactory factory;
factory = provider.createEntityManagerFactory(name, props);
if (factory != null)
return factory;
}
throw new PersistenceException("no persistence provider found for `" + name + '\'');
}
public static PersistenceUtil getPersistenceUtil()
{
return new PersistenceUtilImpl(getProviderList());
}
private static PersistenceProvider []getProviderList()
{
ClassLoader loader = Thread.currentThread().getContextClassLoader();
String []providerClassNames = _providerMap.get(loader);
if (providerClassNames != null)
return loadProviders(providerClassNames);
ArrayList<String> list = new ArrayList<String>();
try {
Class<?> cl = Class.forName(AMBER_PROVIDER, false, loader);
list.add(cl.getName());
} catch (Exception e) {
log.log(Level.FINE, e.toString(), e);
}
try {
Enumeration<URL> e = loader.getResources(SERVICE);
while (e.hasMoreElements()) {
URL url = e.nextElement();
list.addAll(loadProviders(url, loader));
}
} catch (Exception e) {
log.log(Level.WARNING, e.toString(), e);
}
providerClassNames = new String[list.size()];
list.toArray(providerClassNames);
_providerMap.put(loader, providerClassNames);
return loadProviders(providerClassNames);
}
private static PersistenceProvider []loadProviders(String []classNames)
{
int size = classNames.length;
PersistenceProvider []providers = new PersistenceProvider[size];
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
for (int i = 0; i < size; i++) {
try {
Class<?> cl = Class.forName(classNames[i], false, classLoader);
PersistenceProvider provider = (PersistenceProvider) cl.newInstance();
providers[i] = provider;
} catch (Throwable e) {
log.log(Level.WARNING, e.toString(), e);
}
}
return providers;
}
private static List<String> loadProviders(URL url,
ClassLoader loader)
{
List<String> providers = new ArrayList<String>();
InputStream is = null;
try {
is = url.openStream();
int ch;
while ((ch = is.read()) >= 0) {
if (Character.isWhitespace((char) ch)) {
}
else if (ch == '#') {
for (; ch >= 0 && ch != '\n' && ch != '\r'; ch = is.read()) {
}
}
else {
StringBuilder sb = new StringBuilder();
for (;
ch >= 0 && ! Character.isWhitespace((char) ch);
ch = is.read()) {
sb.append((char) ch);
}
String className = sb.toString();
try {
Class<?> cl = Class.forName(className, false, loader);
providers.add(cl.getName());
} catch (Exception e) {
log.log(Level.FINER, e.getMessage(), e);
}
}
}
} catch (Exception e) {
log.log(Level.WARNING, e.toString(), e);
} finally {
try {
if (is != null)
is.close();
} catch (Throwable e) {
}
}
return providers;
}
private static class PersistenceUtilImpl implements PersistenceUtil {
private PersistenceProvider []_providerList;
PersistenceUtilImpl(PersistenceProvider []providerList)
{
_providerList = providerList;
}
@Override
public boolean isLoaded(Object entity, String attributeName)
{
for (PersistenceProvider provider : _providerList) {
try {
ProviderUtil util = provider.getProviderUtil();
if (util != null) {
LoadState state = util.isLoadedWithoutReference(entity, attributeName);
if (state == LoadState.LOADED)
return true;
else if (state == LoadState.NOT_LOADED)
return false;
}
} catch (Exception e) {
log.log(Level.FINER, provider + ": " + e.toString(), e);
} catch (AbstractMethodError e) {
log.log(Level.FINER, provider + ": " + e.toString(), e);
}
}
for (PersistenceProvider provider : _providerList) {
try {
ProviderUtil util = provider.getProviderUtil();
if (util != null) {
LoadState state = util.isLoadedWithReference(entity, attributeName);
if (state == LoadState.LOADED)
return true;
else if (state == LoadState.NOT_LOADED)
return false;
}
} catch (Exception e) {
log.log(Level.FINER, provider + ": " + e.toString(), e);
} catch (AbstractMethodError e) {
log.log(Level.FINER, provider + ": " + e.toString(), e);
}
}
return true;
}
@Override
public boolean isLoaded(Object entity)
{
for (PersistenceProvider provider : _providerList) {
try {
ProviderUtil util = provider.getProviderUtil();
if (util != null) {
LoadState state = util.isLoaded(entity);
if (state == LoadState.LOADED)
return true;
else if (state == LoadState.NOT_LOADED)
return false;
}
} catch (AbstractMethodError e) {
log.log(Level.FINER, provider + ": " + e.toString(), e);
} catch (Exception e) {
log.log(Level.FINER, provider + ": " + e.toString(), e);
}
}
return false;
}
public String toString()
{
return getClass().getSimpleName() + "[]";
}
}
}