Re: [configuration] getProperties not working as I expect...

[Oliver Heger]

That does not surprise me. The documentation for the getProperties() 
method is indeed very short. I had to look inside the code to find out 
what it is doing.

I will see if I can improve it a bit.
Oliver

Poppe, Troy wrote:
Thanks, I think this really boils down, for me, as an misunderstanding/lack of
understanding of the documentation.

I'll find another way to do it.

Thanks.

Troy

-----Original Message-----
From: Oliver Heger [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, June 14, 2005 2:22 AM
To: Jakarta Commons Users List
Subject: Re: [configuration] getProperties not working as I expect...


Poppe, Troy wrote:

Assuming that I use the example XML document on the "XMLConfiguration 
HOWTO" page (see below), I have a question regarding the use of 
Configuration.getProperties().

I'd like to get a List of Properties objects that represent the field 
nodes for a given table.

I started by trying to get a Properties object for one of the field 
nodes, but was unable to.

Any examples for the use of getProperties or getList that might help 
me out here?

Thanks.

Troy Poppe




The Example XML file:

<?xml version="1.0" encoding="ISO-8859-1" ?>

<database>
 <tables>
   <table tableType="system">
     <name>users</name>
     <fields>
       <field>
         <name>uid</name>
         <type>long</type>
       </field>
       <field>
         <name>uname</name>
         <type>java.lang.String</type>
       </field>
       <field>
         <name>firstName</name>
         <type>java.lang.String</type>
       </field>
       <field>
         <name>lastName</name>
         <type>java.lang.String</type>
       </field>
       <field>
         <name>email</name>
         <type>java.lang.String</type>
       </field>
     </fields>
   </table>
   <table tableType="application">
     <name>documents</name>
     <fields>
       <field>
         <name>docid</name>
         <type>long</type>
       </field>
       <field>
         <name>name</name>
         <type>java.lang.String</type>
       </field>
       <field>
         <name>creationDate</name>
         <type>java.util.Date</type>
       </field>
       <field>
         <name>authorID</name>
         <type>long</type>
       </field>
       <field>
         <name>version</name>
         <type>int</type>
       </field>
     </fields>
   </table>
 </tables>
</database>


I had a look at the getProperties() implementation (in 
AbstractConfiguration), but it does not seem to be suitable for your 
needs. AFICT it requires the property values to be queried in a form 
like "key = value", so a supported XML would have to look something like

...
<fields>
   <field>
     <fielddata>name=uid</fielddata>
     <fielddata>type=long</fielddata>
   </field>
   ...
</fields>
...

Then it should be possible to do something like

Properties props = 
config.getProperties("tables.table(0).fields.field(0).fielddata");

for obtaining a properties object with information about the first field 
of the first table (however I didn't test this).

Using getList() allows you to query a single property value at a time 
only. So you can fetch the names of all fields in a table (as shown in 
the howtos), but you cannot retrieve a combination of the fields' names 
and types (or further properties).

IIUYC you would like to do something like

Properties props = config.getProperties("tables.table.fields.field(0)");

and would obtain a Properties object with the keys "name" and "type" and 
the values describing the first field, right? I am sorry, but this is 
not supported ATM. And I am not sure whether it would be possible to 
implement such a feature in a general and intuitive way: this would 
require to parse a property's sub properties and somehow combine them?

Oliver



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