/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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 software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.ejb.plugins.cmp.jdbc;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.*;
import org.jboss.ejb.EntityContainer;
import org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCEntityBridge;
import org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler;
import org.jboss.ejb.plugins.cmp.bridge.FieldBridge;
import org.jboss.ejb.plugins.cmp.bridge.SelectorBridge;
import org.jboss.proxy.compiler.Proxy;
import org.jboss.proxy.compiler.InvocationHandler;
import org.jboss.deployment.DeploymentException;
/**
* JDBCBeanClassInstanceCommand creates instance of the bean class. For
* CMP 2.0 it creates an instance of a subclass of the bean class, as the
* bean class is abstract.
* <p/>
* <FIX-ME>should not generat a subclass for ejb 1.1</FIX-ME>
*
* @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
* @version $Revision: 81030 $
*/
public final class JDBCCreateBeanClassInstanceCommand
{
private final JDBCEntityBridge entityBridge;
private final Class beanClass;
private final Constructor beanProxyConstructor;
private final Map fieldMap;
private final Map selectorMap;
public JDBCCreateBeanClassInstanceCommand(JDBCStoreManager manager)
throws Exception
{
EntityContainer theContainer = manager.getContainer();
entityBridge = (JDBCEntityBridge) manager.getEntityBridge();
beanClass = theContainer.getBeanClass();
fieldMap = createFieldMap();
selectorMap = createSelectorMap();
// use proxy generator to create one implementation
EntityBridgeInvocationHandler handler = new EntityBridgeInvocationHandler(fieldMap, selectorMap, beanClass);
Class[] classes = new Class[]{beanClass};
ClassLoader classLoader = beanClass.getClassLoader();
Object o = Proxy.newProxyInstance(classLoader, classes, handler);
// steal the constructor from the object
beanProxyConstructor = o.getClass().getConstructor(new Class[]{InvocationHandler.class});
// now create one to make sure everything is cool
execute();
}
public void destroy()
{
Proxy.forgetProxyForClass(beanClass);
}
public Object execute() throws Exception
{
EntityBridgeInvocationHandler handler = new EntityBridgeInvocationHandler(fieldMap, selectorMap, beanClass);
return beanProxyConstructor.newInstance(new Object[]{handler});
}
private Map getAbstractAccessors()
{
Method[] methods = beanClass.getMethods();
Map abstractAccessors = new HashMap(methods.length);
for(int i = 0; i < methods.length; i++)
{
if(Modifier.isAbstract(methods[i].getModifiers()))
{
String methodName = methods[i].getName();
if(methodName.startsWith("get") || methodName.startsWith("set"))
{
abstractAccessors.put(methodName, methods[i]);
}
}
}
return abstractAccessors;
}
private Map createFieldMap() throws DeploymentException
{
Map abstractAccessors = getAbstractAccessors();
List fields = entityBridge.getFields();
Map map = new HashMap(fields.size() * 2);
for(int i = 0; i < fields.size(); i++)
{
FieldBridge field = (FieldBridge) fields.get(i);
// get the names
String fieldName = field.getFieldName();
String fieldBaseName = Character.toUpperCase(fieldName.charAt(0)) +
fieldName.substring(1);
String getterName = "get" + fieldBaseName;
String setterName = "set" + fieldBaseName;
// get the accessor methods
Method getterMethod = (Method) abstractAccessors.get(getterName);
Method setterMethod = (Method) abstractAccessors.get(setterName);
// getters and setters must come in pairs
if(getterMethod != null && setterMethod == null)
{
throw new DeploymentException("Getter was found but no setter was found for field " + fieldName
+ " in entity " + entityBridge.getEntityName());
}
else if(getterMethod == null && setterMethod != null)
{
throw new DeploymentException("Setter was found but no getter was found for field " + fieldName
+ " in entity " + entityBridge.getEntityName());
}
else if(getterMethod != null && setterMethod != null)
{
// add methods
map.put(getterMethod.getName(), new EntityBridgeInvocationHandler.FieldGetInvoker(field));
map.put(setterMethod.getName(), new EntityBridgeInvocationHandler.FieldSetInvoker(field));
// remove the accessors (they have been used)
abstractAccessors.remove(getterName);
abstractAccessors.remove(setterName);
}
}
return Collections.unmodifiableMap(map);
}
private Map createSelectorMap()
{
Collection selectors = entityBridge.getSelectors();
Map map = new HashMap(selectors.size());
for(Iterator iter = selectors.iterator(); iter.hasNext();)
{
SelectorBridge selector = (SelectorBridge) iter.next();
//map.put(selector.getMethod().getName(), selector);
map.put(selector.getMethod(), selector);
}
return Collections.unmodifiableMap(map);
}
}