Re: [Webmacro-devel] bug or feature?

[Sharif J. A. <sja...@ya...>]

Hi, 
  
I checked my sublcass and it turns out that I do have the order of the
methods listed as you suggested:

  get(Object key) { ...}
  get(int key) { ... }


I'm sure if this is the root cause of not, but the problem appears to be in
the MethodAccessor class defined in PropertyOperatorCache.java.  I've
included the relevant portion for your reference:

abstract class MethodAccessor extends Accessor {

   protected Method _getMethod;           // only one get method allowed
   private Method[] _setMethods = null; // may be multiple set methods
   private Class[] _setParams = null;  // variable arg type for set meth N
   
   .....

   final void addMethod(final Method m, Class[] params)
         throws PropertyException {

      final int setArgsLength = numArgsSet();
      final int getArgsLength = numArgsGet();

      if (params.length == getArgsLength) {
         _getMethod = m;
      }
      else if (params.length == setArgsLength) {
         setCount++;
         if (_setMethods == null) {
            ....


-Sharif


--- Keats <ke...@xa...> wrote:
> Sharif,
> 
> I believe there is a minor introspection problem with WM if your method has
> a "get(<primitive-type>)" declared before the "get(Object)" method.  You
> should be able to fix your problem by reordering your methods.  For
> example,
> import java.util.Hashtable;
> public class CustomMap extends Hashtable {
>   public Object get(Object key) {
>     System.out.println("CustomMap.get(Object) called with: " + key);
>     return super.get(key);
>   }
>   public Object get(int key) {
>     System.out.println("CustomMap.get(int) called with: " + key);
>     return super.get(new Integer(key));
>   }
> }
> 
> Works, whereas:
> import java.util.Hashtable;
> public class CustomMap extends Hashtable {
>   public Object get(int key) {
>     System.out.println("CustomMap.get(int) called with: " + key);
>     return super.get(new Integer(key));
>   }
>   public Object get(Object key) {
>     System.out.println("CustomMap.get(Object) called with: " + key);
>     return super.get(key);
>   }
> }
> 
> fails.
> 
> I looked into fixing this a couple of years ago, but for some reason
> decided
> it wasn't worth it.  I could look into it again if folks think it's a big
> deal.
> 
> Keats
> 
> ----- Original Message ----- 
> From: "Sharif J. Alexandre" <sja...@ya...>
> To: <web...@li...>
> Sent: Saturday, January 17, 2004 6:31 PM
> Subject: [Webmacro-devel] bug or feature?
> 
> 
> > Hi,
> >
> > I have an object that extends a Hashtable and overloads the get() method
> with
> > a get(int).  When I place this object into a Context, I get an error when
> any
> > of the entries in that object are accessed.  Here's a portion of that
> error:
> >
> > org.webmacro.PropertyException: Some kind of error occurred processing
> your
> > request: this indicates a failure in PropertyOperator.java that should be
> > reported: attempt to access method public java.lang.Object
> > org.dbadmin.util.MyMap.get(int) on object {systemDate=Jan 17, 2004
> 5:31:47
> > PM} with 1 parameters  threw an exception:
> > java.lang.IllegalArgumentException: argument type mismatch
> >
> > I did some digging and found that in engine/PropertyOperatorCache.java a
> > MethodAccessor class is defined which only allows one get method (I'm
> using
> > 1.1 final).  Is there a reason for this?  Shouldn't it be possible to
> include
> > any object in a Context -- even if it's a subclassed Hashtable?
> >
> > Thanks,
> > Sharif
> >
> >
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> 


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