User: tobias
Date: 01/01/02 01:08:54
Added: src/main/org/jboss/ejb/plugins/jaws/bmp
CustomFindByEntitiesCommand.java
Log:
Changes by Michel de Groot, thanks!
1. Added support for custom finder implementations like ejbFind in EJB
implementation class.
2. Custom finder implementations override defined or automatic finders as stated in
the documentation of JBoss.
Revision Changes Path
1.1
jboss/src/main/org/jboss/ejb/plugins/jaws/bmp/CustomFindByEntitiesCommand.java
Index: CustomFindByEntitiesCommand.java
===================================================================
/*
* JBoss, the OpenSource EJB server
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.ejb.plugins.jaws.bmp;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.ArrayList;
import javax.ejb.FinderException;
import org.jboss.ejb.EntityEnterpriseContext;
import org.jboss.logging.Logger;
import org.jboss.ejb.plugins.jaws.JPMFindEntitiesCommand;
import org.jboss.metadata.BeanMetaData;
/**
* JAWSPersistenceManager CustomFindByEntitiesCommand.
* Implements bridge for custom implemented finders in container managed entity
beans.
* These methods are called ejbFindX in the EJB implementation class, where X can be
* anything. Such methods are called findX in the Home interface. The EJB
implementation
* must return a Collection of primary keys.
*
* @see org.jboss.ejb.plugins.jaws.jdbc.JDBCFindEntitiesCommand
* @author <a href="mailto:[EMAIL PROTECTED]">Michel de Groot</a>
* @version $Revision: 1.1 $
*/
public class CustomFindByEntitiesCommand implements JPMFindEntitiesCommand
{
// Attributes ----------------------------------------------------
protected Method finderImplMethod; // method implementing the finder
protected String name; // Command name, used for debug trace
// Constructors --------------------------------------------------
/**
* Constructs a JAWS command which can handle multiple entity finders
* that are BMP implemented.
* @param finderMethod the EJB finder method implementation
*/
public CustomFindByEntitiesCommand(Method finderMethod)
throws IllegalArgumentException
{
finderImplMethod = finderMethod;
// set name for debugging purposes
name = "Custom finder "+finderMethod.getName();
Logger.debug("Finder:"+name);
}
// JPMFindEntitiesCommand implementation -------------------------
public Collection execute(Method finderMethod,
Object[] args,
EntityEnterpriseContext ctx)
throws java.rmi.RemoteException, FinderException
{
Collection result = null;
// invoke implementation method on ejb instance
try {
// if expected return type is Collection, return as is
// if expected return type is not Collection, wrap result in Collection
if (finderMethod.getReturnType().equals(Collection.class)) {
result =
(Collection)finderImplMethod.invoke(ctx.getInstance(),args);
} else {
result = new ArrayList(1);
result.add(finderImplMethod.invoke(ctx.getInstance(),args));
}
} catch (IllegalAccessException e1) {
throw new FinderException("Unable to access finder
implementation:"+finderImplMethod.getName());
} catch (IllegalArgumentException e2) {
throw new FinderException("Illegal arguments for finder
implementation:"+finderImplMethod.getName());
} catch (InvocationTargetException e3) {
throw new FinderException("Exception in finder
implementation:"+finderImplMethod.getName());
} catch (ExceptionInInitializerError e5) {
throw new FinderException("Unable to initialize finder
implementation:"+finderImplMethod.getName());
}
return result;
}
}
