Hi all,
I am having trouble using the PropertyUtils class in the BeanUtils package.
In my classes I have a property Item defined like this:
public class Foo
{
private List items = new ArrayList();
public List getItems() { /* bla bla */ }
public void addItem( Bar newItem ) { /* bla bla */ }
// etc.
/** Return an item by index */
public Bar getItem( int index )
{
return items.get( index );
}
/** Return an item by name */
public Bar getItem( String name )
{
for ( int i=0; i<items.size(); i++ )
{
Bar x = (Bar) items.get( i );
if ( x.getName().equals( name ) )
{
return x;
}
}
return null;
}
}
So there's a property 'items' which is a collection and individual items
can be retrieved using either the mapped version getItem(String) or the
indexed version getItem(int).
I use this class with the PropertyUtils like this (there is an existing Bar
with name="helpme"):
// This one runs fine:
Object obj = PropertyUtils.getProperty( instanceOfFoo, "item[0]" );
// This one throws a NPE:
Object obj = PropertyUtils.getProperty( instanceOfFoo,
"item(helpme)" );
Digging through the PropertyUtils code I found out it relies on the
getPropertyDescriptor() method for getting metadata on the specified bean
(the Foo class in this case). This getProperrtyDescriptor() returns *either*
a java.beans.IndexPropertyDescriptor or a
org.apache.commons.beanutils.MappedPropertyDescriptor and the
IndexedPropertyDescriptor takes precedence.
My question is: Is this the intended behaviour? My property is both mapped
and indexed, and using method overloading to support this seems to be the
right way to do it.
- Bart Guijt
- Bart Guijt
Ordina Finance BIS
E: [EMAIL PROTECTED]
W: www.ordina-finance.nl
A: Paalbergweg 46
1105 BW Amsterdam
P: Postbus 94690
1090 GR Amsterdam
T: +31 20 409 6660
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