001 /**
002 * GRANITE DATA SERVICES
003 * Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 * This file is part of the Granite Data Services Platform.
006 *
007 * Granite Data Services is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * Granite Data Services is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 * General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 * USA, or see <http://www.gnu.org/licenses/>.
021 */
022 package org.granite.hibernate;
023
024 import java.io.Serializable;
025 import java.lang.reflect.Field;
026 import java.lang.reflect.Method;
027 import java.lang.reflect.Type;
028 import java.util.concurrent.ConcurrentHashMap;
029
030 import javax.persistence.EmbeddedId;
031 import javax.persistence.Id;
032
033 import org.granite.config.GraniteConfig;
034 import org.granite.context.GraniteContext;
035 import org.granite.messaging.service.ServiceException;
036 import org.granite.util.TypeUtil;
037 import org.granite.util.Introspector;
038 import org.granite.util.PropertyDescriptor;
039 import org.hibernate.engine.SessionImplementor;
040 import org.hibernate.proxy.HibernateProxy;
041 import org.hibernate.type.AbstractComponentType;
042
043 /**
044 * @author Franck WOLFF
045 */
046 @SuppressWarnings("deprecation")
047 public class ProxyFactory {
048
049 private static final Class<?>[] INTERFACES = new Class[]{HibernateProxy.class};
050
051 protected final ConcurrentHashMap<Class<?>, Object[]> identifierInfos = new ConcurrentHashMap<Class<?>, Object[]>();
052
053 private final Method getProxyFactory;
054 private final Method getProxy;
055
056 public ProxyFactory(String initializerClassName) {
057 try {
058 // Get proxy methods: even if CGLIB/Javassist LazyInitializer implementations share a common
059 // superclass, getProxyFactory/getProxy methods are declared as static in each inherited
060 // class with the same signature.
061 Class<?> initializerClass = TypeUtil.forName(initializerClassName);
062 getProxyFactory = initializerClass.getMethod("getProxyFactory", new Class[]{Class.class, Class[].class});
063 Class<?> componentTypeClass = AbstractComponentType.class;
064 try {
065 // Hibernate 3.6
066 componentTypeClass = TypeUtil.forName("org.hibernate.type.CompositeType");
067 }
068 catch (ClassNotFoundException e) {
069 // Hibernate until 3.5
070 }
071 getProxy = initializerClass.getMethod("getProxy", new Class[]{
072 Class.class, String.class, Class.class, Class[].class, Method.class, Method.class,
073 componentTypeClass, Serializable.class, SessionImplementor.class
074 });
075 }
076 catch (Exception e) {
077 throw new ServiceException("Could not introspect initializer class: " + initializerClassName, e);
078 }
079 }
080
081 public HibernateProxy getProxyInstance(String persistentClassName, String entityName, Serializable id) {
082 try {
083 // Get ProxyFactory.
084 Class<?> persistentClass = TypeUtil.forName(persistentClassName);
085 Class<?> factory = (Class<?>)getProxyFactory.invoke(null, new Object[]{persistentClass, INTERFACES});
086
087 // Convert id (if necessary).
088 Object[] identifierInfo = getIdentifierInfo(persistentClass);
089 Type identifierType = (Type)identifierInfo[0];
090 Method identifierGetter = (Method)identifierInfo[1];
091 if (id == null || !identifierType.equals(id.getClass())) {
092 GraniteConfig config = GraniteContext.getCurrentInstance().getGraniteConfig();
093 id = (Serializable)config.getConverters().convert(id, identifierType);
094 }
095
096 // Get Proxy
097 return (HibernateProxy)getProxy.invoke(null, new Object[]{factory, entityName, persistentClass, INTERFACES, identifierGetter, null, null, id, null});
098 }
099 catch (Exception e) {
100 throw new ServiceException("Error with proxy description: " + persistentClassName + '/' + entityName + " and id: " + id, e);
101 }
102 }
103
104 protected Object[] getIdentifierInfo(Class<?> persistentClass) {
105
106 Object[] info = identifierInfos.get(persistentClass);
107 if (info != null)
108 return info;
109
110 Type type = null;
111 Method getter = null;
112 for (Class<?> clazz = persistentClass; clazz != Object.class && clazz != null; clazz = clazz.getSuperclass()) {
113 for (Field field : clazz.getDeclaredFields()) {
114 if (field.isAnnotationPresent(Id.class) || field.isAnnotationPresent(EmbeddedId.class)) {
115 type = field.getGenericType();
116 break;
117 }
118 }
119 }
120
121 if (type == null) {
122 PropertyDescriptor[] propertyDescriptors = Introspector.getPropertyDescriptors(persistentClass);
123
124 for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
125 Method method = propertyDescriptor.getReadMethod();
126 if (method != null && (
127 method.isAnnotationPresent(Id.class) ||
128 method.isAnnotationPresent(EmbeddedId.class))) {
129 type = method.getGenericReturnType();
130 getter = method;
131 break;
132 }
133 method = propertyDescriptor.getWriteMethod();
134 if (method != null && (
135 method.isAnnotationPresent(Id.class) ||
136 method.isAnnotationPresent(EmbeddedId.class))) {
137 type = method.getGenericParameterTypes()[0];
138 break;
139 }
140 }
141 }
142
143 if (type != null) {
144 info = new Object[] { type, getter };
145 Object[] previousInfo = identifierInfos.putIfAbsent(persistentClass, info);
146 if (previousInfo != null)
147 info = previousInfo; // should be the same...
148 return info;
149 }
150
151 throw new IllegalArgumentException("Could not find id in: " + persistentClass);
152 }
153 }