Re: Lazily loading user defined types

[Johannes Klose]

I've done some hacking on the LazyResultLoader class and came to a 
working solution. I created an interface named "Deferrable" which is 
basically just a marker interface. Properties which can be lazily loaded 
on user defined types are typed as interfaces which extend Deferrable. 
If a result loader for such a type is requested, the LazyResultLoader 
will create a proxy for this type and lazy loading works.

Here is the modified code, maybe it is useful for someone else too.
Deferrable:

package com.ibatis.sqlmap.engine.mapping.result.loader;

public interface Deferrable {

}

loadResult() in LazyResultLoader:

public Object loadResult() throws SQLException {
   if (Collection.class.isAssignableFrom(targetType)) {
     InvocationHandler handler = new LazyResultLoader(client, 
statementName, parameterObject, targetType);
     ClassLoader cl = targetType.getClassLoader();
     return Proxy.newProxyInstance(cl, LIST_INTERFACES, handler);
   } else if(targetType.isInterface() && 
Deferrable.class.isAssignableFrom(targetType)) {
       InvocationHandler handler = new LazyResultLoader(client, 
statementName, parameterObject, targetType);
       ClassLoader cl = targetType.getClassLoader();
       return Proxy.newProxyInstance(cl, new Class[] { targetType }, 
handler);
     } else {
         return ResultLoader.getResult(client, statementName, 
parameterObject, targetType);
     }
 }